deparse.c File Reference

#include "postgres.h"
#include "access/htup_details.h"
#include "access/sysattr.h"
#include "access/table.h"
#include "catalog/pg_aggregate.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_operator.h"
#include "catalog/pg_opfamily.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_type.h"
#include "commands/defrem.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "nodes/plannodes.h"
#include "optimizer/optimizer.h"
#include "optimizer/prep.h"
#include "optimizer/tlist.h"
#include "parser/parsetree.h"
#include "postgres_fdw.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#include "utils/syscache.h"
#include "utils/typcache.h"
#include "commands/tablecmds.h"

Include dependency graph for deparse.c:

Go to the source code of this file.

Data Structures
struct	foreign_glob_cxt
struct	foreign_loc_cxt
struct	deparse_expr_cxt

Macros
#define	REL_ALIAS_PREFIX   "r"
#define	ADD_REL_QUALIFIER(buf, varno)    appendStringInfo((buf), "%s%d.", REL_ALIAS_PREFIX, (varno))
#define	SUBQUERY_REL_ALIAS_PREFIX   "s"
#define	SUBQUERY_COL_ALIAS_PREFIX   "c"

Typedefs
typedef struct foreign_glob_cxt	foreign_glob_cxt
typedef struct foreign_loc_cxt	foreign_loc_cxt
typedef struct deparse_expr_cxt	deparse_expr_cxt

Enumerations
enum	FDWCollateState { FDW_COLLATE_NONE , FDW_COLLATE_SAFE , FDW_COLLATE_UNSAFE }

Functions
static bool	foreign_expr_walker (Node *node, foreign_glob_cxt *glob_cxt, foreign_loc_cxt *outer_cxt, foreign_loc_cxt *case_arg_cxt)
static char *	deparse_type_name (Oid type_oid, int32 typemod)
static void	deparseTargetList (StringInfo buf, RangeTblEntry *rte, Index rtindex, Relation rel, bool is_returning, Bitmapset *attrs_used, bool qualify_col, List **retrieved_attrs)
static void	deparseExplicitTargetList (List *tlist, bool is_returning, List **retrieved_attrs, deparse_expr_cxt *context)
static void	deparseSubqueryTargetList (deparse_expr_cxt *context)
static void	deparseReturningList (StringInfo buf, RangeTblEntry *rte, Index rtindex, Relation rel, bool trig_after_row, List *withCheckOptionList, List *returningList, List **retrieved_attrs)
static void	deparseColumnRef (StringInfo buf, int varno, int varattno, RangeTblEntry *rte, bool qualify_col)
static void	deparseRelation (StringInfo buf, Relation rel)
static void	deparseExpr (Expr *expr, deparse_expr_cxt *context)
static void	deparseVar (Var *node, deparse_expr_cxt *context)
static void	deparseConst (Const *node, deparse_expr_cxt *context, int showtype)
static void	deparseParam (Param *node, deparse_expr_cxt *context)
static void	deparseSubscriptingRef (SubscriptingRef *node, deparse_expr_cxt *context)
static void	deparseFuncExpr (FuncExpr *node, deparse_expr_cxt *context)
static void	deparseOpExpr (OpExpr *node, deparse_expr_cxt *context)
static bool	isPlainForeignVar (Expr *node, deparse_expr_cxt *context)
static void	deparseOperatorName (StringInfo buf, Form_pg_operator opform)
static void	deparseDistinctExpr (DistinctExpr *node, deparse_expr_cxt *context)
static void	deparseScalarArrayOpExpr (ScalarArrayOpExpr *node, deparse_expr_cxt *context)
static void	deparseRelabelType (RelabelType *node, deparse_expr_cxt *context)
static void	deparseBoolExpr (BoolExpr *node, deparse_expr_cxt *context)
static void	deparseNullTest (NullTest *node, deparse_expr_cxt *context)
static void	deparseCaseExpr (CaseExpr *node, deparse_expr_cxt *context)
static void	deparseArrayExpr (ArrayExpr *node, deparse_expr_cxt *context)
static void	printRemoteParam (int paramindex, Oid paramtype, int32 paramtypmod, deparse_expr_cxt *context)
static void	printRemotePlaceholder (Oid paramtype, int32 paramtypmod, deparse_expr_cxt *context)
static void	deparseSelectSql (List *tlist, bool is_subquery, List **retrieved_attrs, deparse_expr_cxt *context)
static void	deparseLockingClause (deparse_expr_cxt *context)
static void	appendOrderByClause (List *pathkeys, bool has_final_sort, deparse_expr_cxt *context)
static void	appendLimitClause (deparse_expr_cxt *context)
static void	appendConditions (List *exprs, deparse_expr_cxt *context)
static void	deparseFromExprForRel (StringInfo buf, PlannerInfo *root, RelOptInfo *foreignrel, bool use_alias, Index ignore_rel, List **ignore_conds, List **params_list)
static void	deparseFromExpr (List *quals, deparse_expr_cxt *context)
static void	deparseRangeTblRef (StringInfo buf, PlannerInfo *root, RelOptInfo *foreignrel, bool make_subquery, Index ignore_rel, List **ignore_conds, List **params_list)
static void	deparseAggref (Aggref *node, deparse_expr_cxt *context)
static void	appendGroupByClause (List *tlist, deparse_expr_cxt *context)
static void	appendOrderBySuffix (Oid sortop, Oid sortcoltype, bool nulls_first, deparse_expr_cxt *context)
static void	appendAggOrderBy (List *orderList, List *targetList, deparse_expr_cxt *context)
static void	appendFunctionName (Oid funcid, deparse_expr_cxt *context)
static Node *	deparseSortGroupClause (Index ref, List *tlist, bool force_colno, deparse_expr_cxt *context)
static bool	is_subquery_var (Var *node, RelOptInfo *foreignrel, int *relno, int *colno)
static void	get_relation_column_alias_ids (Var *node, RelOptInfo *foreignrel, int *relno, int *colno)
void	classifyConditions (PlannerInfo *root, RelOptInfo *baserel, List *input_conds, List **remote_conds, List **local_conds)
bool	is_foreign_expr (PlannerInfo *root, RelOptInfo *baserel, Expr *expr)
bool	is_foreign_param (PlannerInfo *root, RelOptInfo *baserel, Expr *expr)
bool	is_foreign_pathkey (PlannerInfo *root, RelOptInfo *baserel, PathKey *pathkey)
List *	build_tlist_to_deparse (RelOptInfo *foreignrel)
void	deparseSelectStmtForRel (StringInfo buf, PlannerInfo *root, RelOptInfo *rel, List *tlist, List *remote_conds, List *pathkeys, bool has_final_sort, bool has_limit, bool is_subquery, List **retrieved_attrs, List **params_list)
const char *	get_jointype_name (JoinType jointype)
void	deparseInsertSql (StringInfo buf, RangeTblEntry *rte, Index rtindex, Relation rel, List *targetAttrs, bool doNothing, List *withCheckOptionList, List *returningList, List **retrieved_attrs, int *values_end_len)
void	rebuildInsertSql (StringInfo buf, Relation rel, char *orig_query, List *target_attrs, int values_end_len, int num_params, int num_rows)
void	deparseUpdateSql (StringInfo buf, RangeTblEntry *rte, Index rtindex, Relation rel, List *targetAttrs, List *withCheckOptionList, List *returningList, List **retrieved_attrs)
void	deparseDirectUpdateSql (StringInfo buf, PlannerInfo *root, Index rtindex, Relation rel, RelOptInfo *foreignrel, List *targetlist, List *targetAttrs, List *remote_conds, List **params_list, List *returningList, List **retrieved_attrs)
void	deparseDeleteSql (StringInfo buf, RangeTblEntry *rte, Index rtindex, Relation rel, List *returningList, List **retrieved_attrs)
void	deparseDirectDeleteSql (StringInfo buf, PlannerInfo *root, Index rtindex, Relation rel, RelOptInfo *foreignrel, List *remote_conds, List **params_list, List *returningList, List **retrieved_attrs)
void	deparseAnalyzeSizeSql (StringInfo buf, Relation rel)
void	deparseAnalyzeSql (StringInfo buf, Relation rel, List **retrieved_attrs)
void	deparseTruncateSql (StringInfo buf, List *rels, DropBehavior behavior, bool restart_seqs)
void	deparseStringLiteral (StringInfo buf, const char *val)

Macro Definition Documentation

ADD_REL_QUALIFIER

#define ADD_REL_QUALIFIER	(		buf,
			varno
	)		appendStringInfo((buf), "%s%d.", REL_ALIAS_PREFIX, (varno))

Definition at line 109 of file deparse.c.

REL_ALIAS_PREFIX

#define REL_ALIAS_PREFIX   "r"

Definition at line 107 of file deparse.c.

SUBQUERY_COL_ALIAS_PREFIX

#define SUBQUERY_COL_ALIAS_PREFIX   "c"

Definition at line 112 of file deparse.c.

SUBQUERY_REL_ALIAS_PREFIX

#define SUBQUERY_REL_ALIAS_PREFIX   "s"

Definition at line 111 of file deparse.c.

Typedef Documentation

deparse_expr_cxt

typedef struct deparse_expr_cxt deparse_expr_cxt

foreign_glob_cxt

typedef struct foreign_glob_cxt foreign_glob_cxt

foreign_loc_cxt

typedef struct foreign_loc_cxt foreign_loc_cxt

Enumeration Type Documentation

FDWCollateState

enum FDWCollateState

Enumerator
FDW_COLLATE_NONE
FDW_COLLATE_SAFE
FDW_COLLATE_UNSAFE

Definition at line 77 of file deparse.c.

{
    FDW_COLLATE_NONE,           /* expression is of a noncollatable type, or
                                 * it has default collation that is not
                                 * traceable to a foreign Var */
    FDW_COLLATE_SAFE,           /* collation derives from a foreign Var */
    FDW_COLLATE_UNSAFE          /* collation is non-default and derives from
                                 * something other than a foreign Var */
} FDWCollateState;

Function Documentation

appendAggOrderBy()

static void appendAggOrderBy ( List *  orderList, List *  targetList, deparse_expr_cxt *  context  )

static

Definition at line 3468 of file deparse.c.

{
    StringInfo  buf = context->buf;
    ListCell   *lc;
    bool        first = true;
 
    foreach(lc, orderList)
    {
        SortGroupClause *srt = (SortGroupClause *) lfirst(lc);
        Node       *sortexpr;
 
        if (!first)
            appendStringInfoString(buf, ", ");
        first = false;
 
        /* Deparse the sort expression proper. */
        sortexpr = deparseSortGroupClause(srt->tleSortGroupRef, targetList,
                                          false, context);
        /* Add decoration as needed. */
        appendOrderBySuffix(srt->sortop, exprType(sortexpr), srt->nulls_first,
                            context);
    }
}

References appendOrderBySuffix(), appendStringInfoString(), deparse_expr_cxt::buf, buf, deparseSortGroupClause(), exprType(), lfirst, SortGroupClause::nulls_first, SortGroupClause::sortop, and SortGroupClause::tleSortGroupRef.

Referenced by deparseAggref().

appendConditions()

static void appendConditions ( List *  exprs, deparse_expr_cxt *  context  )

static

Definition at line 1499 of file deparse.c.

{
    int         nestlevel;
    ListCell   *lc;
    bool        is_first = true;
    StringInfo  buf = context->buf;
 
    /* Make sure any constants in the exprs are printed portably */
    nestlevel = set_transmission_modes();
 
    foreach(lc, exprs)
    {
        Expr       *expr = (Expr *) lfirst(lc);
 
        /* Extract clause from RestrictInfo, if required */
        if (IsA(expr, RestrictInfo))
            expr = ((RestrictInfo *) expr)->clause;
 
        /* Connect expressions with "AND" and parenthesize each condition. */
        if (!is_first)
            appendStringInfoString(buf, " AND ");
 
        appendStringInfoChar(buf, '(');
        deparseExpr(expr, context);
        appendStringInfoChar(buf, ')');
 
        is_first = false;
    }
 
    reset_transmission_modes(nestlevel);
}

References appendStringInfoChar(), appendStringInfoString(), deparse_expr_cxt::buf, buf, deparseExpr(), IsA, lfirst, reset_transmission_modes(), and set_transmission_modes().

Referenced by deparseDirectDeleteSql(), deparseDirectUpdateSql(), deparseFromExpr(), deparseFromExprForRel(), and deparseSelectStmtForRel().

appendFunctionName()

static void appendFunctionName ( Oid  funcid, deparse_expr_cxt *  context  )

static

Definition at line 3727 of file deparse.c.

{
    StringInfo  buf = context->buf;
    HeapTuple   proctup;
    Form_pg_proc procform;
    const char *proname;
 
    proctup = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcid));
    if (!HeapTupleIsValid(proctup))
        elog(ERROR, "cache lookup failed for function %u", funcid);
    procform = (Form_pg_proc) GETSTRUCT(proctup);
 
    /* Print schema name only if it's not pg_catalog */
    if (procform->pronamespace != PG_CATALOG_NAMESPACE)
    {
        const char *schemaname;
 
        schemaname = get_namespace_name(procform->pronamespace);
        appendStringInfo(buf, "%s.", quote_identifier(schemaname));
    }
 
    /* Always print the function name */
    proname = NameStr(procform->proname);
    appendStringInfoString(buf, quote_identifier(proname));
 
    ReleaseSysCache(proctup);
}

References appendStringInfo(), appendStringInfoString(), deparse_expr_cxt::buf, buf, elog(), ERROR, get_namespace_name(), GETSTRUCT, HeapTupleIsValid, NameStr, ObjectIdGetDatum, PROCOID, proname, quote_identifier(), ReleaseSysCache(), and SearchSysCache1().

Referenced by deparseAggref(), and deparseFuncExpr().

appendGroupByClause()

static void appendGroupByClause ( List *  tlist, deparse_expr_cxt *  context  )

static

Definition at line 3581 of file deparse.c.

{
    StringInfo  buf = context->buf;
    Query      *query = context->root->parse;
    ListCell   *lc;
    bool        first = true;
 
    /* Nothing to be done, if there's no GROUP BY clause in the query. */
    if (!query->groupClause)
        return;
 
    appendStringInfoString(buf, " GROUP BY ");
 
    /*
     * Queries with grouping sets are not pushed down, so we don't expect
     * grouping sets here.
     */
    Assert(!query->groupingSets);
 
    foreach(lc, query->groupClause)
    {
        SortGroupClause *grp = (SortGroupClause *) lfirst(lc);
 
        if (!first)
            appendStringInfoString(buf, ", ");
        first = false;
 
        deparseSortGroupClause(grp->tleSortGroupRef, tlist, true, context);
    }
}

References appendStringInfoString(), Assert(), deparse_expr_cxt::buf, buf, deparseSortGroupClause(), Query::groupClause, Query::groupingSets, lfirst, PlannerInfo::parse, deparse_expr_cxt::root, and SortGroupClause::tleSortGroupRef.

Referenced by deparseSelectStmtForRel().

appendLimitClause()

static void appendLimitClause ( deparse_expr_cxt *  context )

static

Definition at line 3699 of file deparse.c.

{
    PlannerInfo *root = context->root;
    StringInfo  buf = context->buf;
    int         nestlevel;
 
    /* Make sure any constants in the exprs are printed portably */
    nestlevel = set_transmission_modes();
 
    if (root->parse->limitCount)
    {
        appendStringInfoString(buf, " LIMIT ");
        deparseExpr((Expr *) root->parse->limitCount, context);
    }
    if (root->parse->limitOffset)
    {
        appendStringInfoString(buf, " OFFSET ");
        deparseExpr((Expr *) root->parse->limitOffset, context);
    }
 
    reset_transmission_modes(nestlevel);
}

References appendStringInfoString(), deparse_expr_cxt::buf, buf, deparseExpr(), Query::limitCount, Query::limitOffset, PlannerInfo::parse, reset_transmission_modes(), deparse_expr_cxt::root, and set_transmission_modes().

Referenced by deparseSelectStmtForRel().

appendOrderByClause()

static void appendOrderByClause ( List *  pathkeys, bool  has_final_sort, deparse_expr_cxt *  context  )

static

Definition at line 3622 of file deparse.c.

{
    ListCell   *lcell;
    int         nestlevel;
    const char *delim = " ";
    StringInfo  buf = context->buf;
 
    /* Make sure any constants in the exprs are printed portably */
    nestlevel = set_transmission_modes();
 
    appendStringInfoString(buf, " ORDER BY");
    foreach(lcell, pathkeys)
    {
        PathKey    *pathkey = lfirst(lcell);
        EquivalenceMember *em;
        Expr       *em_expr;
        Oid         oprid;
 
        if (has_final_sort)
        {
            /*
             * By construction, context->foreignrel is the input relation to
             * the final sort.
             */
            em = find_em_for_rel_target(context->root,
                                        pathkey->pk_eclass,
                                        context->foreignrel);
        }
        else
            em = find_em_for_rel(context->root,
                                 pathkey->pk_eclass,
                                 context->scanrel);
 
        /*
         * We don't expect any error here; it would mean that shippability
         * wasn't verified earlier.  For the same reason, we don't recheck
         * shippability of the sort operator.
         */
        if (em == NULL)
            elog(ERROR, "could not find pathkey item to sort");
 
        em_expr = em->em_expr;
 
        /*
         * Lookup the operator corresponding to the strategy in the opclass.
         * The datatype used by the opfamily is not necessarily the same as
         * the expression type (for array types for example).
         */
        oprid = get_opfamily_member(pathkey->pk_opfamily,
                                    em->em_datatype,
                                    em->em_datatype,
                                    pathkey->pk_strategy);
        if (!OidIsValid(oprid))
            elog(ERROR, "missing operator %d(%u,%u) in opfamily %u",
                 pathkey->pk_strategy, em->em_datatype, em->em_datatype,
                 pathkey->pk_opfamily);
 
        appendStringInfoString(buf, delim);
        deparseExpr(em_expr, context);
 
        /*
         * Here we need to use the expression's actual type to discover
         * whether the desired operator will be the default or not.
         */
        appendOrderBySuffix(oprid, exprType((Node *) em_expr),
                            pathkey->pk_nulls_first, context);
 
        delim = ", ";
    }
    reset_transmission_modes(nestlevel);
}

References appendOrderBySuffix(), appendStringInfoString(), deparse_expr_cxt::buf, buf, deparseExpr(), elog(), EquivalenceMember::em_datatype, EquivalenceMember::em_expr, ERROR, exprType(), find_em_for_rel(), find_em_for_rel_target(), deparse_expr_cxt::foreignrel, get_opfamily_member(), lfirst, OidIsValid, oprid(), PathKey::pk_eclass, PathKey::pk_nulls_first, PathKey::pk_opfamily, PathKey::pk_strategy, reset_transmission_modes(), deparse_expr_cxt::root, deparse_expr_cxt::scanrel, and set_transmission_modes().

Referenced by deparseSelectStmtForRel().

appendOrderBySuffix()

static void appendOrderBySuffix ( Oid  sortop, Oid  sortcoltype, bool  nulls_first, deparse_expr_cxt *  context  )

static

Definition at line 3497 of file deparse.c.

{
    StringInfo  buf = context->buf;
    TypeCacheEntry *typentry;
 
    /* See whether operator is default < or > for sort expr's datatype. */
    typentry = lookup_type_cache(sortcoltype,
                                 TYPECACHE_LT_OPR | TYPECACHE_GT_OPR);
 
    if (sortop == typentry->lt_opr)
        appendStringInfoString(buf, " ASC");
    else if (sortop == typentry->gt_opr)
        appendStringInfoString(buf, " DESC");
    else
    {
        HeapTuple   opertup;
        Form_pg_operator operform;
 
        appendStringInfoString(buf, " USING ");
 
        /* Append operator name. */
        opertup = SearchSysCache1(OPEROID, ObjectIdGetDatum(sortop));
        if (!HeapTupleIsValid(opertup))
            elog(ERROR, "cache lookup failed for operator %u", sortop);
        operform = (Form_pg_operator) GETSTRUCT(opertup);
        deparseOperatorName(buf, operform);
        ReleaseSysCache(opertup);
    }
 
    if (nulls_first)
        appendStringInfoString(buf, " NULLS FIRST");
    else
        appendStringInfoString(buf, " NULLS LAST");
}

References appendStringInfoString(), deparse_expr_cxt::buf, buf, deparseOperatorName(), elog(), ERROR, GETSTRUCT, TypeCacheEntry::gt_opr, HeapTupleIsValid, lookup_type_cache(), TypeCacheEntry::lt_opr, ObjectIdGetDatum, OPEROID, ReleaseSysCache(), SearchSysCache1(), TYPECACHE_GT_OPR, and TYPECACHE_LT_OPR.

Referenced by appendAggOrderBy(), and appendOrderByClause().

build_tlist_to_deparse()

List* build_tlist_to_deparse

(

RelOptInfo *

foreignrel

)

Definition at line 1102 of file deparse.c.

{
    List       *tlist = NIL;
    PgFdwRelationInfo *fpinfo = (PgFdwRelationInfo *) foreignrel->fdw_private;
    ListCell   *lc;
 
    /*
     * For an upper relation, we have already built the target list while
     * checking shippability, so just return that.
     */
    if (IS_UPPER_REL(foreignrel))
        return fpinfo->grouped_tlist;
 
    /*
     * We require columns specified in foreignrel->reltarget->exprs and those
     * required for evaluating the local conditions.
     */
    tlist = add_to_flat_tlist(tlist,
                              pull_var_clause((Node *) foreignrel->reltarget->exprs,
                                              PVC_RECURSE_PLACEHOLDERS));
    foreach(lc, fpinfo->local_conds)
    {
        RestrictInfo *rinfo = lfirst_node(RestrictInfo, lc);
 
        tlist = add_to_flat_tlist(tlist,
                                  pull_var_clause((Node *) rinfo->clause,
                                                  PVC_RECURSE_PLACEHOLDERS));
    }
 
    return tlist;
}

References add_to_flat_tlist(), RestrictInfo::clause, PathTarget::exprs, RelOptInfo::fdw_private, PgFdwRelationInfo::grouped_tlist, if(), IS_UPPER_REL, lfirst_node, PgFdwRelationInfo::local_conds, NIL, pull_var_clause(), PVC_RECURSE_PLACEHOLDERS, and RelOptInfo::reltarget.

Referenced by estimate_path_cost_size(), and postgresGetForeignPlan().

classifyConditions()

void classifyConditions	(	PlannerInfo *	root,
		RelOptInfo *	baserel,
		List *	input_conds,
		List **	remote_conds,
		List **	local_conds
	)

Definition at line 211 of file deparse.c.

{
    ListCell   *lc;
 
    *remote_conds = NIL;
    *local_conds = NIL;
 
    foreach(lc, input_conds)
    {
        RestrictInfo *ri = lfirst_node(RestrictInfo, lc);
 
        if (is_foreign_expr(root, baserel, ri->clause))
            *remote_conds = lappend(*remote_conds, ri);
        else
            *local_conds = lappend(*local_conds, ri);
    }
}

References RestrictInfo::clause, is_foreign_expr(), lappend(), lfirst_node, and NIL.

Referenced by estimate_path_cost_size(), and postgresGetForeignRelSize().

deparse_type_name()

static char * deparse_type_name ( Oid  type_oid, int32  typemod  )

static

Definition at line 1083 of file deparse.c.

{
    bits16      flags = FORMAT_TYPE_TYPEMOD_GIVEN;
 
    if (!is_builtin(type_oid))
        flags |= FORMAT_TYPE_FORCE_QUALIFY;
 
    return format_type_extended(type_oid, typemod, flags);
}

References format_type_extended(), FORMAT_TYPE_FORCE_QUALIFY, FORMAT_TYPE_TYPEMOD_GIVEN, and is_builtin().

Referenced by deparseArrayExpr(), deparseConst(), deparseFuncExpr(), deparseRelabelType(), printRemoteParam(), and printRemotePlaceholder().

deparseAggref()

static void deparseAggref ( Aggref *  node, deparse_expr_cxt *  context  )

static

Definition at line 3376 of file deparse.c.

{
    StringInfo  buf = context->buf;
    bool        use_variadic;
 
    /* Only basic, non-split aggregation accepted. */
    Assert(node->aggsplit == AGGSPLIT_SIMPLE);
 
    /* Check if need to print VARIADIC (cf. ruleutils.c) */
    use_variadic = node->aggvariadic;
 
    /* Find aggregate name from aggfnoid which is a pg_proc entry */
    appendFunctionName(node->aggfnoid, context);
    appendStringInfoChar(buf, '(');
 
    /* Add DISTINCT */
    appendStringInfoString(buf, (node->aggdistinct != NIL) ? "DISTINCT " : "");
 
    if (AGGKIND_IS_ORDERED_SET(node->aggkind))
    {
        /* Add WITHIN GROUP (ORDER BY ..) */
        ListCell   *arg;
        bool        first = true;
 
        Assert(!node->aggvariadic);
        Assert(node->aggorder != NIL);
 
        foreach(arg, node->aggdirectargs)
        {
            if (!first)
                appendStringInfoString(buf, ", ");
            first = false;
 
            deparseExpr((Expr *) lfirst(arg), context);
        }
 
        appendStringInfoString(buf, ") WITHIN GROUP (ORDER BY ");
        appendAggOrderBy(node->aggorder, node->args, context);
    }
    else
    {
        /* aggstar can be set only in zero-argument aggregates */
        if (node->aggstar)
            appendStringInfoChar(buf, '*');
        else
        {
            ListCell   *arg;
            bool        first = true;
 
            /* Add all the arguments */
            foreach(arg, node->args)
            {
                TargetEntry *tle = (TargetEntry *) lfirst(arg);
                Node       *n = (Node *) tle->expr;
 
                if (tle->resjunk)
                    continue;
 
                if (!first)
                    appendStringInfoString(buf, ", ");
                first = false;
 
                /* Add VARIADIC */
                if (use_variadic && lnext(node->args, arg) == NULL)
                    appendStringInfoString(buf, "VARIADIC ");
 
                deparseExpr((Expr *) n, context);
            }
        }
 
        /* Add ORDER BY */
        if (node->aggorder != NIL)
        {
            appendStringInfoString(buf, " ORDER BY ");
            appendAggOrderBy(node->aggorder, node->args, context);
        }
    }
 
    /* Add FILTER (WHERE ..) */
    if (node->aggfilter != NULL)
    {
        appendStringInfoString(buf, ") FILTER (WHERE ");
        deparseExpr((Expr *) node->aggfilter, context);
    }
 
    appendStringInfoChar(buf, ')');
}

References Aggref::aggdirectargs, Aggref::aggdistinct, Aggref::aggfilter, Aggref::aggfnoid, Aggref::aggkind, Aggref::aggorder, Aggref::aggsplit, AGGSPLIT_SIMPLE, Aggref::aggstar, Aggref::aggvariadic, appendAggOrderBy(), appendFunctionName(), appendStringInfoChar(), appendStringInfoString(), arg, Aggref::args, Assert(), deparse_expr_cxt::buf, buf, deparseExpr(), TargetEntry::expr, if(), lfirst, lnext(), NIL, and TargetEntry::resjunk.

Referenced by deparseExpr().

deparseAnalyzeSizeSql()

void deparseAnalyzeSizeSql	(	StringInfo	buf,
		Relation	rel
	)

Definition at line 2287 of file deparse.c.

{
    StringInfoData relname;
 
    /* We'll need the remote relation name as a literal. */
    initStringInfo(&relname);
    deparseRelation(&relname, rel);
 
    appendStringInfoString(buf, "SELECT pg_catalog.pg_relation_size(");
    deparseStringLiteral(buf, relname.data);
    appendStringInfo(buf, "::pg_catalog.regclass) / %d", BLCKSZ);
}

References appendStringInfo(), appendStringInfoString(), buf, nameData::data, deparseRelation(), deparseStringLiteral(), initStringInfo(), and relname.

Referenced by postgresAnalyzeForeignTable().

deparseAnalyzeSql()

void deparseAnalyzeSql	(	StringInfo	buf,
		Relation	rel,
		List **	retrieved_attrs
	)

Definition at line 2307 of file deparse.c.

{
    Oid         relid = RelationGetRelid(rel);
    TupleDesc   tupdesc = RelationGetDescr(rel);
    int         i;
    char       *colname;
    List       *options;
    ListCell   *lc;
    bool        first = true;
 
    *retrieved_attrs = NIL;
 
    appendStringInfoString(buf, "SELECT ");
    for (i = 0; i < tupdesc->natts; i++)
    {
        /* Ignore dropped columns. */
        if (TupleDescAttr(tupdesc, i)->attisdropped)
            continue;
 
        if (!first)
            appendStringInfoString(buf, ", ");
        first = false;
 
        /* Use attribute name or column_name option. */
        colname = NameStr(TupleDescAttr(tupdesc, i)->attname);
        options = GetForeignColumnOptions(relid, i + 1);
 
        foreach(lc, options)
        {
            DefElem    *def = (DefElem *) lfirst(lc);
 
            if (strcmp(def->defname, "column_name") == 0)
            {
                colname = defGetString(def);
                break;
            }
        }
 
        appendStringInfoString(buf, quote_identifier(colname));
 
        *retrieved_attrs = lappend_int(*retrieved_attrs, i + 1);
    }
 
    /* Don't generate bad syntax for zero-column relation. */
    if (first)
        appendStringInfoString(buf, "NULL");
 
    /*
     * Construct FROM clause
     */
    appendStringInfoString(buf, " FROM ");
    deparseRelation(buf, rel);
}

References appendStringInfoString(), attname, buf, defGetString(), DefElem::defname, deparseRelation(), GetForeignColumnOptions(), i, lappend_int(), lfirst, NameStr, TupleDescData::natts, NIL, options, quote_identifier(), RelationGetDescr, RelationGetRelid, and TupleDescAttr.

Referenced by postgresAcquireSampleRowsFunc().

deparseArrayExpr()

static void deparseArrayExpr ( ArrayExpr *  node, deparse_expr_cxt *  context  )

static

Definition at line 3350 of file deparse.c.

{
    StringInfo  buf = context->buf;
    bool        first = true;
    ListCell   *lc;
 
    appendStringInfoString(buf, "ARRAY[");
    foreach(lc, node->elements)
    {
        if (!first)
            appendStringInfoString(buf, ", ");
        deparseExpr(lfirst(lc), context);
        first = false;
    }
    appendStringInfoChar(buf, ']');
 
    /* If the array is empty, we need an explicit cast to the array type. */
    if (node->elements == NIL)
        appendStringInfo(buf, "::%s",
                         deparse_type_name(node->array_typeid, -1));
}

References appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), ArrayExpr::array_typeid, deparse_expr_cxt::buf, buf, deparse_type_name(), deparseExpr(), ArrayExpr::elements, lfirst, and NIL.

Referenced by deparseExpr().

deparseBoolExpr()

static void deparseBoolExpr ( BoolExpr *  node, deparse_expr_cxt *  context  )

static

Definition at line 3229 of file deparse.c.

{
    StringInfo  buf = context->buf;
    const char *op = NULL;      /* keep compiler quiet */
    bool        first;
    ListCell   *lc;
 
    switch (node->boolop)
    {
        case AND_EXPR:
            op = "AND";
            break;
        case OR_EXPR:
            op = "OR";
            break;
        case NOT_EXPR:
            appendStringInfoString(buf, "(NOT ");
            deparseExpr(linitial(node->args), context);
            appendStringInfoChar(buf, ')');
            return;
    }
 
    appendStringInfoChar(buf, '(');
    first = true;
    foreach(lc, node->args)
    {
        if (!first)
            appendStringInfo(buf, " %s ", op);
        deparseExpr((Expr *) lfirst(lc), context);
        first = false;
    }
    appendStringInfoChar(buf, ')');
}

References AND_EXPR, appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), BoolExpr::args, BoolExpr::boolop, deparse_expr_cxt::buf, buf, deparseExpr(), lfirst, linitial, NOT_EXPR, and OR_EXPR.

Referenced by deparseExpr().

deparseCaseExpr()

static void deparseCaseExpr ( CaseExpr *  node, deparse_expr_cxt *  context  )

static

Definition at line 3300 of file deparse.c.

{
    StringInfo  buf = context->buf;
    ListCell   *lc;
 
    appendStringInfoString(buf, "(CASE");
 
    /* If this is a CASE arg WHEN then emit the arg expression */
    if (node->arg != NULL)
    {
        appendStringInfoChar(buf, ' ');
        deparseExpr(node->arg, context);
    }
 
    /* Add each condition/result of the CASE clause */
    foreach(lc, node->args)
    {
        CaseWhen   *whenclause = (CaseWhen *) lfirst(lc);
 
        /* WHEN */
        appendStringInfoString(buf, " WHEN ");
        if (node->arg == NULL)  /* CASE WHEN */
            deparseExpr(whenclause->expr, context);
        else                    /* CASE arg WHEN */
        {
            /* Ignore the CaseTestExpr and equality operator. */
            deparseExpr(lsecond(castNode(OpExpr, whenclause->expr)->args),
                        context);
        }
 
        /* THEN */
        appendStringInfoString(buf, " THEN ");
        deparseExpr(whenclause->result, context);
    }
 
    /* add ELSE if present */
    if (node->defresult != NULL)
    {
        appendStringInfoString(buf, " ELSE ");
        deparseExpr(node->defresult, context);
    }
 
    /* append END */
    appendStringInfoString(buf, " END)");
}

References appendStringInfoChar(), appendStringInfoString(), CaseExpr::arg, CaseExpr::args, deparse_expr_cxt::buf, buf, castNode, CaseExpr::defresult, deparseExpr(), CaseWhen::expr, lfirst, lsecond, and CaseWhen::result.

Referenced by deparseExpr().

deparseColumnRef()

static void deparseColumnRef ( StringInfo  buf, int  varno, int  varattno, RangeTblEntry *  rte, bool  qualify_col  )

static

Definition at line 2400 of file deparse.c.

{
    /* We support fetching the remote side's CTID and OID. */
    if (varattno == SelfItemPointerAttributeNumber)
    {
        if (qualify_col)
            ADD_REL_QUALIFIER(buf, varno);
        appendStringInfoString(buf, "ctid");
    }
    else if (varattno < 0)
    {
        /*
         * All other system attributes are fetched as 0, except for table OID,
         * which is fetched as the local table OID.  However, we must be
         * careful; the table could be beneath an outer join, in which case it
         * must go to NULL whenever the rest of the row does.
         */
        Oid         fetchval = 0;
 
        if (varattno == TableOidAttributeNumber)
            fetchval = rte->relid;
 
        if (qualify_col)
        {
            appendStringInfoString(buf, "CASE WHEN (");
            ADD_REL_QUALIFIER(buf, varno);
            appendStringInfo(buf, "*)::text IS NOT NULL THEN %u END", fetchval);
        }
        else
            appendStringInfo(buf, "%u", fetchval);
    }
    else if (varattno == 0)
    {
        /* Whole row reference */
        Relation    rel;
        Bitmapset  *attrs_used;
 
        /* Required only to be passed down to deparseTargetList(). */
        List       *retrieved_attrs;
 
        /*
         * The lock on the relation will be held by upper callers, so it's
         * fine to open it with no lock here.
         */
        rel = table_open(rte->relid, NoLock);
 
        /*
         * The local name of the foreign table can not be recognized by the
         * foreign server and the table it references on foreign server might
         * have different column ordering or different columns than those
         * declared locally. Hence we have to deparse whole-row reference as
         * ROW(columns referenced locally). Construct this by deparsing a
         * "whole row" attribute.
         */
        attrs_used = bms_add_member(NULL,
                                    0 - FirstLowInvalidHeapAttributeNumber);
 
        /*
         * In case the whole-row reference is under an outer join then it has
         * to go NULL whenever the rest of the row goes NULL. Deparsing a join
         * query would always involve multiple relations, thus qualify_col
         * would be true.
         */
        if (qualify_col)
        {
            appendStringInfoString(buf, "CASE WHEN (");
            ADD_REL_QUALIFIER(buf, varno);
            appendStringInfoString(buf, "*)::text IS NOT NULL THEN ");
        }
 
        appendStringInfoString(buf, "ROW(");
        deparseTargetList(buf, rte, varno, rel, false, attrs_used, qualify_col,
                          &retrieved_attrs);
        appendStringInfoChar(buf, ')');
 
        /* Complete the CASE WHEN statement started above. */
        if (qualify_col)
            appendStringInfoString(buf, " END");
 
        table_close(rel, NoLock);
        bms_free(attrs_used);
    }
    else
    {
        char       *colname = NULL;
        List       *options;
        ListCell   *lc;
 
        /* varno must not be any of OUTER_VAR, INNER_VAR and INDEX_VAR. */
        Assert(!IS_SPECIAL_VARNO(varno));
 
        /*
         * If it's a column of a foreign table, and it has the column_name FDW
         * option, use that value.
         */
        options = GetForeignColumnOptions(rte->relid, varattno);
        foreach(lc, options)
        {
            DefElem    *def = (DefElem *) lfirst(lc);
 
            if (strcmp(def->defname, "column_name") == 0)
            {
                colname = defGetString(def);
                break;
            }
        }
 
        /*
         * If it's a column of a regular table or it doesn't have column_name
         * FDW option, use attribute name.
         */
        if (colname == NULL)
            colname = get_attname(rte->relid, varattno, false);
 
        if (qualify_col)
            ADD_REL_QUALIFIER(buf, varno);
 
        appendStringInfoString(buf, quote_identifier(colname));
    }
}

References ADD_REL_QUALIFIER, appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), Assert(), bms_add_member(), bms_free(), buf, defGetString(), DefElem::defname, deparseTargetList(), FirstLowInvalidHeapAttributeNumber, get_attname(), GetForeignColumnOptions(), IS_SPECIAL_VARNO, lfirst, NoLock, options, quote_identifier(), RangeTblEntry::relid, SelfItemPointerAttributeNumber, table_close(), table_open(), and TableOidAttributeNumber.

Referenced by deparseDirectUpdateSql(), deparseInsertSql(), deparseTargetList(), deparseUpdateSql(), and deparseVar().

deparseConst()

static void deparseConst ( Const *  node, deparse_expr_cxt *  context, int  showtype  )

static

Definition at line 2739 of file deparse.c.

{
    StringInfo  buf = context->buf;
    Oid         typoutput;
    bool        typIsVarlena;
    char       *extval;
    bool        isfloat = false;
    bool        isstring = false;
    bool        needlabel;
 
    if (node->constisnull)
    {
        appendStringInfoString(buf, "NULL");
        if (showtype >= 0)
            appendStringInfo(buf, "::%s",
                             deparse_type_name(node->consttype,
                                               node->consttypmod));
        return;
    }
 
    getTypeOutputInfo(node->consttype,
                      &typoutput, &typIsVarlena);
    extval = OidOutputFunctionCall(typoutput, node->constvalue);
 
    switch (node->consttype)
    {
        case INT2OID:
        case INT4OID:
        case INT8OID:
        case OIDOID:
        case FLOAT4OID:
        case FLOAT8OID:
        case NUMERICOID:
            {
                /*
                 * No need to quote unless it's a special value such as 'NaN'.
                 * See comments in get_const_expr().
                 */
                if (strspn(extval, "0123456789+-eE.") == strlen(extval))
                {
                    if (extval[0] == '+' || extval[0] == '-')
                        appendStringInfo(buf, "(%s)", extval);
                    else
                        appendStringInfoString(buf, extval);
                    if (strcspn(extval, "eE.") != strlen(extval))
                        isfloat = true; /* it looks like a float */
                }
                else
                    appendStringInfo(buf, "'%s'", extval);
            }
            break;
        case BITOID:
        case VARBITOID:
            appendStringInfo(buf, "B'%s'", extval);
            break;
        case BOOLOID:
            if (strcmp(extval, "t") == 0)
                appendStringInfoString(buf, "true");
            else
                appendStringInfoString(buf, "false");
            break;
        default:
            deparseStringLiteral(buf, extval);
            isstring = true;
            break;
    }
 
    pfree(extval);
 
    if (showtype == -1)
        return;                 /* never print type label */
 
    /*
     * For showtype == 0, append ::typename unless the constant will be
     * implicitly typed as the right type when it is read in.
     *
     * XXX this code has to be kept in sync with the behavior of the parser,
     * especially make_const.
     */
    switch (node->consttype)
    {
        case BOOLOID:
        case INT4OID:
        case UNKNOWNOID:
            needlabel = false;
            break;
        case NUMERICOID:
            needlabel = !isfloat || (node->consttypmod >= 0);
            break;
        default:
            if (showtype == -2)
            {
                /* label unless we printed it as an untyped string */
                needlabel = !isstring;
            }
            else
                needlabel = true;
            break;
    }
    if (needlabel || showtype > 0)
        appendStringInfo(buf, "::%s",
                         deparse_type_name(node->consttype,
                                           node->consttypmod));
}

References appendStringInfo(), appendStringInfoString(), deparse_expr_cxt::buf, buf, Const::constisnull, Const::consttype, Const::consttypmod, Const::constvalue, deparse_type_name(), deparseStringLiteral(), getTypeOutputInfo(), OidOutputFunctionCall(), and pfree().

Referenced by deparseExpr(), deparseOpExpr(), and deparseSortGroupClause().

deparseDeleteSql()

void deparseDeleteSql	(	StringInfo	buf,
		RangeTblEntry *	rte,
		Index	rtindex,
		Relation	rel,
		List *	returningList,
		List **	retrieved_attrs
	)

Definition at line 2150 of file deparse.c.

{
    appendStringInfoString(buf, "DELETE FROM ");
    deparseRelation(buf, rel);
    appendStringInfoString(buf, " WHERE ctid = $1");
 
    deparseReturningList(buf, rte, rtindex, rel,
                         rel->trigdesc && rel->trigdesc->trig_delete_after_row,
                         NIL, returningList, retrieved_attrs);
}

References appendStringInfoString(), buf, deparseRelation(), deparseReturningList(), NIL, TriggerDesc::trig_delete_after_row, and RelationData::trigdesc.

Referenced by postgresPlanForeignModify().

deparseDirectDeleteSql()

void deparseDirectDeleteSql	(	StringInfo	buf,
		PlannerInfo *	root,
		Index	rtindex,
		Relation	rel,
		RelOptInfo *	foreignrel,
		List *	remote_conds,
		List **	params_list,
		List *	returningList,
		List **	retrieved_attrs
	)

Definition at line 2179 of file deparse.c.

{
    deparse_expr_cxt context;
 
    /* Set up context struct for recursion */
    context.root = root;
    context.foreignrel = foreignrel;
    context.scanrel = foreignrel;
    context.buf = buf;
    context.params_list = params_list;
 
    appendStringInfoString(buf, "DELETE FROM ");
    deparseRelation(buf, rel);
    if (foreignrel->reloptkind == RELOPT_JOINREL)
        appendStringInfo(buf, " %s%d", REL_ALIAS_PREFIX, rtindex);
 
    if (foreignrel->reloptkind == RELOPT_JOINREL)
    {
        List       *ignore_conds = NIL;
 
        appendStringInfoString(buf, " USING ");
        deparseFromExprForRel(buf, root, foreignrel, true, rtindex,
                              &ignore_conds, params_list);
        remote_conds = list_concat(remote_conds, ignore_conds);
    }
 
    if (remote_conds)
    {
        appendStringInfoString(buf, " WHERE ");
        appendConditions(remote_conds, &context);
    }
 
    if (foreignrel->reloptkind == RELOPT_JOINREL)
        deparseExplicitTargetList(returningList, true, retrieved_attrs,
                                  &context);
    else
        deparseReturningList(buf, planner_rt_fetch(rtindex, root),
                             rtindex, rel, false,
                             NIL, returningList, retrieved_attrs);
}

References appendConditions(), appendStringInfo(), appendStringInfoString(), deparse_expr_cxt::buf, buf, deparseExplicitTargetList(), deparseFromExprForRel(), deparseRelation(), deparseReturningList(), deparse_expr_cxt::foreignrel, list_concat(), NIL, deparse_expr_cxt::params_list, planner_rt_fetch, REL_ALIAS_PREFIX, RELOPT_JOINREL, RelOptInfo::reloptkind, deparse_expr_cxt::root, and deparse_expr_cxt::scanrel.

Referenced by postgresPlanDirectModify().

deparseDirectUpdateSql()

void deparseDirectUpdateSql	(	StringInfo	buf,
		PlannerInfo *	root,
		Index	rtindex,
		Relation	rel,
		RelOptInfo *	foreignrel,
		List *	targetlist,
		List *	targetAttrs,
		List *	remote_conds,
		List **	params_list,
		List *	returningList,
		List **	retrieved_attrs
	)

Definition at line 2065 of file deparse.c.

{
    deparse_expr_cxt context;
    int         nestlevel;
    bool        first;
    RangeTblEntry *rte = planner_rt_fetch(rtindex, root);
    ListCell   *lc,
               *lc2;
 
    /* Set up context struct for recursion */
    context.root = root;
    context.foreignrel = foreignrel;
    context.scanrel = foreignrel;
    context.buf = buf;
    context.params_list = params_list;
 
    appendStringInfoString(buf, "UPDATE ");
    deparseRelation(buf, rel);
    if (foreignrel->reloptkind == RELOPT_JOINREL)
        appendStringInfo(buf, " %s%d", REL_ALIAS_PREFIX, rtindex);
    appendStringInfoString(buf, " SET ");
 
    /* Make sure any constants in the exprs are printed portably */
    nestlevel = set_transmission_modes();
 
    first = true;
    forboth(lc, targetlist, lc2, targetAttrs)
    {
        TargetEntry *tle = lfirst_node(TargetEntry, lc);
        int         attnum = lfirst_int(lc2);
 
        /* update's new-value expressions shouldn't be resjunk */
        Assert(!tle->resjunk);
 
        if (!first)
            appendStringInfoString(buf, ", ");
        first = false;
 
        deparseColumnRef(buf, rtindex, attnum, rte, false);
        appendStringInfoString(buf, " = ");
        deparseExpr((Expr *) tle->expr, &context);
    }
 
    reset_transmission_modes(nestlevel);
 
    if (foreignrel->reloptkind == RELOPT_JOINREL)
    {
        List       *ignore_conds = NIL;
 
        appendStringInfoString(buf, " FROM ");
        deparseFromExprForRel(buf, root, foreignrel, true, rtindex,
                              &ignore_conds, params_list);
        remote_conds = list_concat(remote_conds, ignore_conds);
    }
 
    if (remote_conds)
    {
        appendStringInfoString(buf, " WHERE ");
        appendConditions(remote_conds, &context);
    }
 
    if (foreignrel->reloptkind == RELOPT_JOINREL)
        deparseExplicitTargetList(returningList, true, retrieved_attrs,
                                  &context);
    else
        deparseReturningList(buf, rte, rtindex, rel, false,
                             NIL, returningList, retrieved_attrs);
}

References appendConditions(), appendStringInfo(), appendStringInfoString(), Assert(), attnum, deparse_expr_cxt::buf, buf, deparseColumnRef(), deparseExplicitTargetList(), deparseExpr(), deparseFromExprForRel(), deparseRelation(), deparseReturningList(), TargetEntry::expr, forboth, deparse_expr_cxt::foreignrel, lfirst_int, lfirst_node, list_concat(), NIL, deparse_expr_cxt::params_list, planner_rt_fetch, REL_ALIAS_PREFIX, RELOPT_JOINREL, RelOptInfo::reloptkind, reset_transmission_modes(), TargetEntry::resjunk, deparse_expr_cxt::root, deparse_expr_cxt::scanrel, and set_transmission_modes().

Referenced by postgresPlanDirectModify().

deparseDistinctExpr()

static void deparseDistinctExpr ( DistinctExpr *  node, deparse_expr_cxt *  context  )

static

Definition at line 3153 of file deparse.c.

{
    StringInfo  buf = context->buf;
 
    Assert(list_length(node->args) == 2);
 
    appendStringInfoChar(buf, '(');
    deparseExpr(linitial(node->args), context);
    appendStringInfoString(buf, " IS DISTINCT FROM ");
    deparseExpr(lsecond(node->args), context);
    appendStringInfoChar(buf, ')');
}

References appendStringInfoChar(), appendStringInfoString(), OpExpr::args, Assert(), deparse_expr_cxt::buf, buf, deparseExpr(), linitial, list_length(), and lsecond.

Referenced by deparseExpr().

deparseExplicitTargetList()

static void deparseExplicitTargetList ( List *  tlist, bool  is_returning, List **  retrieved_attrs, deparse_expr_cxt *  context  )

static

Definition at line 1570 of file deparse.c.

{
    ListCell   *lc;
    StringInfo  buf = context->buf;
    int         i = 0;
 
    *retrieved_attrs = NIL;
 
    foreach(lc, tlist)
    {
        TargetEntry *tle = lfirst_node(TargetEntry, lc);
 
        if (i > 0)
            appendStringInfoString(buf, ", ");
        else if (is_returning)
            appendStringInfoString(buf, " RETURNING ");
 
        deparseExpr((Expr *) tle->expr, context);
 
        *retrieved_attrs = lappend_int(*retrieved_attrs, i + 1);
        i++;
    }
 
    if (i == 0 && !is_returning)
        appendStringInfoString(buf, "NULL");
}

References appendStringInfoString(), deparse_expr_cxt::buf, buf, deparseExpr(), TargetEntry::expr, i, lappend_int(), lfirst_node, and NIL.

Referenced by deparseDirectDeleteSql(), deparseDirectUpdateSql(), and deparseSelectSql().

deparseExpr()

static void deparseExpr ( Expr *  expr, deparse_expr_cxt *  context  )

static

Definition at line 2603 of file deparse.c.

{
    if (node == NULL)
        return;
 
    switch (nodeTag(node))
    {
        case T_Var:
            deparseVar((Var *) node, context);
            break;
        case T_Const:
            deparseConst((Const *) node, context, 0);
            break;
        case T_Param:
            deparseParam((Param *) node, context);
            break;
        case T_SubscriptingRef:
            deparseSubscriptingRef((SubscriptingRef *) node, context);
            break;
        case T_FuncExpr:
            deparseFuncExpr((FuncExpr *) node, context);
            break;
        case T_OpExpr:
            deparseOpExpr((OpExpr *) node, context);
            break;
        case T_DistinctExpr:
            deparseDistinctExpr((DistinctExpr *) node, context);
            break;
        case T_ScalarArrayOpExpr:
            deparseScalarArrayOpExpr((ScalarArrayOpExpr *) node, context);
            break;
        case T_RelabelType:
            deparseRelabelType((RelabelType *) node, context);
            break;
        case T_BoolExpr:
            deparseBoolExpr((BoolExpr *) node, context);
            break;
        case T_NullTest:
            deparseNullTest((NullTest *) node, context);
            break;
        case T_CaseExpr:
            deparseCaseExpr((CaseExpr *) node, context);
            break;
        case T_ArrayExpr:
            deparseArrayExpr((ArrayExpr *) node, context);
            break;
        case T_Aggref:
            deparseAggref((Aggref *) node, context);
            break;
        default:
            elog(ERROR, "unsupported expression type for deparse: %d",
                 (int) nodeTag(node));
            break;
    }
}

References deparseAggref(), deparseArrayExpr(), deparseBoolExpr(), deparseCaseExpr(), deparseConst(), deparseDistinctExpr(), deparseFuncExpr(), deparseNullTest(), deparseOpExpr(), deparseParam(), deparseRelabelType(), deparseScalarArrayOpExpr(), deparseSubscriptingRef(), deparseVar(), elog(), ERROR, nodeTag, T_Aggref, T_ArrayExpr, T_BoolExpr, T_CaseExpr, T_Const, T_DistinctExpr, T_FuncExpr, T_NullTest, T_OpExpr, T_Param, T_RelabelType, T_ScalarArrayOpExpr, T_SubscriptingRef, and T_Var.

Referenced by appendConditions(), appendLimitClause(), appendOrderByClause(), deparseAggref(), deparseArrayExpr(), deparseBoolExpr(), deparseCaseExpr(), deparseDirectUpdateSql(), deparseDistinctExpr(), deparseExplicitTargetList(), deparseFuncExpr(), deparseNullTest(), deparseOpExpr(), deparseRelabelType(), deparseScalarArrayOpExpr(), deparseSortGroupClause(), deparseSubqueryTargetList(), and deparseSubscriptingRef().

deparseFromExpr()

static void deparseFromExpr ( List *  quals, deparse_expr_cxt *  context  )

static

Definition at line 1299 of file deparse.c.

{
    StringInfo  buf = context->buf;
    RelOptInfo *scanrel = context->scanrel;
 
    /* For upper relations, scanrel must be either a joinrel or a baserel */
    Assert(!IS_UPPER_REL(context->foreignrel) ||
           IS_JOIN_REL(scanrel) || IS_SIMPLE_REL(scanrel));
 
    /* Construct FROM clause */
    appendStringInfoString(buf, " FROM ");
    deparseFromExprForRel(buf, context->root, scanrel,
                          (bms_membership(scanrel->relids) == BMS_MULTIPLE),
                          (Index) 0, NULL, context->params_list);
 
    /* Construct WHERE clause */
    if (quals != NIL)
    {
        appendStringInfoString(buf, " WHERE ");
        appendConditions(quals, context);
    }
}

References appendConditions(), appendStringInfoString(), Assert(), bms_membership(), BMS_MULTIPLE, deparse_expr_cxt::buf, buf, deparseFromExprForRel(), deparse_expr_cxt::foreignrel, IS_JOIN_REL, IS_SIMPLE_REL, IS_UPPER_REL, NIL, deparse_expr_cxt::params_list, RelOptInfo::relids, deparse_expr_cxt::root, and deparse_expr_cxt::scanrel.

Referenced by deparseSelectStmtForRel().

deparseFromExprForRel()

static void deparseFromExprForRel ( StringInfo  buf, PlannerInfo *  root, RelOptInfo *  foreignrel, bool  use_alias, Index  ignore_rel, List **  ignore_conds, List **  params_list  )

static

Definition at line 1647 of file deparse.c.

{
    PgFdwRelationInfo *fpinfo = (PgFdwRelationInfo *) foreignrel->fdw_private;
 
    if (IS_JOIN_REL(foreignrel))
    {
        StringInfoData join_sql_o;
        StringInfoData join_sql_i;
        RelOptInfo *outerrel = fpinfo->outerrel;
        RelOptInfo *innerrel = fpinfo->innerrel;
        bool        outerrel_is_target = false;
        bool        innerrel_is_target = false;
 
        if (ignore_rel > 0 && bms_is_member(ignore_rel, foreignrel->relids))
        {
            /*
             * If this is an inner join, add joinclauses to *ignore_conds and
             * set it to empty so that those can be deparsed into the WHERE
             * clause.  Note that since the target relation can never be
             * within the nullable side of an outer join, those could safely
             * be pulled up into the WHERE clause (see foreign_join_ok()).
             * Note also that since the target relation is only inner-joined
             * to any other relation in the query, all conditions in the join
             * tree mentioning the target relation could be deparsed into the
             * WHERE clause by doing this recursively.
             */
            if (fpinfo->jointype == JOIN_INNER)
            {
                *ignore_conds = list_concat(*ignore_conds,
                                            fpinfo->joinclauses);
                fpinfo->joinclauses = NIL;
            }
 
            /*
             * Check if either of the input relations is the target relation.
             */
            if (outerrel->relid == ignore_rel)
                outerrel_is_target = true;
            else if (innerrel->relid == ignore_rel)
                innerrel_is_target = true;
        }
 
        /* Deparse outer relation if not the target relation. */
        if (!outerrel_is_target)
        {
            initStringInfo(&join_sql_o);
            deparseRangeTblRef(&join_sql_o, root, outerrel,
                               fpinfo->make_outerrel_subquery,
                               ignore_rel, ignore_conds, params_list);
 
            /*
             * If inner relation is the target relation, skip deparsing it.
             * Note that since the join of the target relation with any other
             * relation in the query is an inner join and can never be within
             * the nullable side of an outer join, the join could be
             * interchanged with higher-level joins (cf. identity 1 on outer
             * join reordering shown in src/backend/optimizer/README), which
             * means it's safe to skip the target-relation deparsing here.
             */
            if (innerrel_is_target)
            {
                Assert(fpinfo->jointype == JOIN_INNER);
                Assert(fpinfo->joinclauses == NIL);
                appendBinaryStringInfo(buf, join_sql_o.data, join_sql_o.len);
                return;
            }
        }
 
        /* Deparse inner relation if not the target relation. */
        if (!innerrel_is_target)
        {
            initStringInfo(&join_sql_i);
            deparseRangeTblRef(&join_sql_i, root, innerrel,
                               fpinfo->make_innerrel_subquery,
                               ignore_rel, ignore_conds, params_list);
 
            /*
             * If outer relation is the target relation, skip deparsing it.
             * See the above note about safety.
             */
            if (outerrel_is_target)
            {
                Assert(fpinfo->jointype == JOIN_INNER);
                Assert(fpinfo->joinclauses == NIL);
                appendBinaryStringInfo(buf, join_sql_i.data, join_sql_i.len);
                return;
            }
        }
 
        /* Neither of the relations is the target relation. */
        Assert(!outerrel_is_target && !innerrel_is_target);
 
        /*
         * For a join relation FROM clause entry is deparsed as
         *
         * ((outer relation) <join type> (inner relation) ON (joinclauses))
         */
        appendStringInfo(buf, "(%s %s JOIN %s ON ", join_sql_o.data,
                         get_jointype_name(fpinfo->jointype), join_sql_i.data);
 
        /* Append join clause; (TRUE) if no join clause */
        if (fpinfo->joinclauses)
        {
            deparse_expr_cxt context;
 
            context.buf = buf;
            context.foreignrel = foreignrel;
            context.scanrel = foreignrel;
            context.root = root;
            context.params_list = params_list;
 
            appendStringInfoChar(buf, '(');
            appendConditions(fpinfo->joinclauses, &context);
            appendStringInfoChar(buf, ')');
        }
        else
            appendStringInfoString(buf, "(TRUE)");
 
        /* End the FROM clause entry. */
        appendStringInfoChar(buf, ')');
    }
    else
    {
        RangeTblEntry *rte = planner_rt_fetch(foreignrel->relid, root);
 
        /*
         * Core code already has some lock on each rel being planned, so we
         * can use NoLock here.
         */
        Relation    rel = table_open(rte->relid, NoLock);
 
        deparseRelation(buf, rel);
 
        /*
         * Add a unique alias to avoid any conflict in relation names due to
         * pulled up subqueries in the query being built for a pushed down
         * join.
         */
        if (use_alias)
            appendStringInfo(buf, " %s%d", REL_ALIAS_PREFIX, foreignrel->relid);
 
        table_close(rel, NoLock);
    }
}

References appendBinaryStringInfo(), appendConditions(), appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), Assert(), bms_is_member(), deparse_expr_cxt::buf, buf, StringInfoData::data, deparseRangeTblRef(), deparseRelation(), RelOptInfo::fdw_private, deparse_expr_cxt::foreignrel, get_jointype_name(), if(), initStringInfo(), PgFdwRelationInfo::innerrel, IS_JOIN_REL, JOIN_INNER, PgFdwRelationInfo::joinclauses, PgFdwRelationInfo::jointype, StringInfoData::len, list_concat(), PgFdwRelationInfo::make_innerrel_subquery, PgFdwRelationInfo::make_outerrel_subquery, NIL, NoLock, PgFdwRelationInfo::outerrel, deparse_expr_cxt::params_list, planner_rt_fetch, REL_ALIAS_PREFIX, RangeTblEntry::relid, RelOptInfo::relid, RelOptInfo::relids, deparse_expr_cxt::root, deparse_expr_cxt::scanrel, table_close(), and table_open().

Referenced by deparseDirectDeleteSql(), deparseDirectUpdateSql(), deparseFromExpr(), and deparseRangeTblRef().

deparseFuncExpr()

static void deparseFuncExpr ( FuncExpr *  node, deparse_expr_cxt *  context  )

static

Definition at line 2932 of file deparse.c.

{
    StringInfo  buf = context->buf;
    bool        use_variadic;
    bool        first;
    ListCell   *arg;
 
    /*
     * If the function call came from an implicit coercion, then just show the
     * first argument.
     */
    if (node->funcformat == COERCE_IMPLICIT_CAST)
    {
        deparseExpr((Expr *) linitial(node->args), context);
        return;
    }
 
    /*
     * If the function call came from a cast, then show the first argument
     * plus an explicit cast operation.
     */
    if (node->funcformat == COERCE_EXPLICIT_CAST)
    {
        Oid         rettype = node->funcresulttype;
        int32       coercedTypmod;
 
        /* Get the typmod if this is a length-coercion function */
        (void) exprIsLengthCoercion((Node *) node, &coercedTypmod);
 
        deparseExpr((Expr *) linitial(node->args), context);
        appendStringInfo(buf, "::%s",
                         deparse_type_name(rettype, coercedTypmod));
        return;
    }
 
    /* Check if need to print VARIADIC (cf. ruleutils.c) */
    use_variadic = node->funcvariadic;
 
    /*
     * Normal function: display as proname(args).
     */
    appendFunctionName(node->funcid, context);
    appendStringInfoChar(buf, '(');
 
    /* ... and all the arguments */
    first = true;
    foreach(arg, node->args)
    {
        if (!first)
            appendStringInfoString(buf, ", ");
        if (use_variadic && lnext(node->args, arg) == NULL)
            appendStringInfoString(buf, "VARIADIC ");
        deparseExpr((Expr *) lfirst(arg), context);
        first = false;
    }
    appendStringInfoChar(buf, ')');
}

References appendFunctionName(), appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), arg, FuncExpr::args, deparse_expr_cxt::buf, buf, COERCE_EXPLICIT_CAST, COERCE_IMPLICIT_CAST, deparse_type_name(), deparseExpr(), exprIsLengthCoercion(), FuncExpr::funcformat, FuncExpr::funcid, FuncExpr::funcresulttype, FuncExpr::funcvariadic, lfirst, linitial, and lnext().

Referenced by deparseExpr().

deparseInsertSql()

void deparseInsertSql	(	StringInfo	buf,
		RangeTblEntry *	rte,
		Index	rtindex,
		Relation	rel,
		List *	targetAttrs,
		bool	doNothing,
		List *	withCheckOptionList,
		List *	returningList,
		List **	retrieved_attrs,
		int *	values_end_len
	)

Definition at line 1872 of file deparse.c.

{
    TupleDesc   tupdesc = RelationGetDescr(rel);
    AttrNumber  pindex;
    bool        first;
    ListCell   *lc;
 
    appendStringInfoString(buf, "INSERT INTO ");
    deparseRelation(buf, rel);
 
    if (targetAttrs)
    {
        appendStringInfoChar(buf, '(');
 
        first = true;
        foreach(lc, targetAttrs)
        {
            int         attnum = lfirst_int(lc);
 
            if (!first)
                appendStringInfoString(buf, ", ");
            first = false;
 
            deparseColumnRef(buf, rtindex, attnum, rte, false);
        }
 
        appendStringInfoString(buf, ") VALUES (");
 
        pindex = 1;
        first = true;
        foreach(lc, targetAttrs)
        {
            int         attnum = lfirst_int(lc);
            Form_pg_attribute attr = TupleDescAttr(tupdesc, attnum - 1);
 
            if (!first)
                appendStringInfoString(buf, ", ");
            first = false;
 
            if (attr->attgenerated)
                appendStringInfoString(buf, "DEFAULT");
            else
            {
                appendStringInfo(buf, "$%d", pindex);
                pindex++;
            }
        }
 
        appendStringInfoChar(buf, ')');
    }
    else
        appendStringInfoString(buf, " DEFAULT VALUES");
    *values_end_len = buf->len;
 
    if (doNothing)
        appendStringInfoString(buf, " ON CONFLICT DO NOTHING");
 
    deparseReturningList(buf, rte, rtindex, rel,
                         rel->trigdesc && rel->trigdesc->trig_insert_after_row,
                         withCheckOptionList, returningList, retrieved_attrs);
}

References appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), attnum, buf, deparseColumnRef(), deparseRelation(), deparseReturningList(), lfirst_int, RelationGetDescr, TriggerDesc::trig_insert_after_row, RelationData::trigdesc, and TupleDescAttr.

Referenced by postgresBeginForeignInsert(), and postgresPlanForeignModify().

deparseLockingClause()

static void deparseLockingClause ( deparse_expr_cxt *  context )

static

Definition at line 1409 of file deparse.c.

{
    StringInfo  buf = context->buf;
    PlannerInfo *root = context->root;
    RelOptInfo *rel = context->scanrel;
    PgFdwRelationInfo *fpinfo = (PgFdwRelationInfo *) rel->fdw_private;
    int         relid = -1;
 
    while ((relid = bms_next_member(rel->relids, relid)) >= 0)
    {
        /*
         * Ignore relation if it appears in a lower subquery.  Locking clause
         * for such a relation is included in the subquery if necessary.
         */
        if (bms_is_member(relid, fpinfo->lower_subquery_rels))
            continue;
 
        /*
         * Add FOR UPDATE/SHARE if appropriate.  We apply locking during the
         * initial row fetch, rather than later on as is done for local
         * tables. The extra roundtrips involved in trying to duplicate the
         * local semantics exactly don't seem worthwhile (see also comments
         * for RowMarkType).
         *
         * Note: because we actually run the query as a cursor, this assumes
         * that DECLARE CURSOR ... FOR UPDATE is supported, which it isn't
         * before 8.3.
         */
        if (bms_is_member(relid, root->all_result_relids) &&
            (root->parse->commandType == CMD_UPDATE ||
             root->parse->commandType == CMD_DELETE))
        {
            /* Relation is UPDATE/DELETE target, so use FOR UPDATE */
            appendStringInfoString(buf, " FOR UPDATE");
 
            /* Add the relation alias if we are here for a join relation */
            if (IS_JOIN_REL(rel))
                appendStringInfo(buf, " OF %s%d", REL_ALIAS_PREFIX, relid);
        }
        else
        {
            PlanRowMark *rc = get_plan_rowmark(root->rowMarks, relid);
 
            if (rc)
            {
                /*
                 * Relation is specified as a FOR UPDATE/SHARE target, so
                 * handle that.  (But we could also see LCS_NONE, meaning this
                 * isn't a target relation after all.)
                 *
                 * For now, just ignore any [NO] KEY specification, since (a)
                 * it's not clear what that means for a remote table that we
                 * don't have complete information about, and (b) it wouldn't
                 * work anyway on older remote servers.  Likewise, we don't
                 * worry about NOWAIT.
                 */
                switch (rc->strength)
                {
                    case LCS_NONE:
                        /* No locking needed */
                        break;
                    case LCS_FORKEYSHARE:
                    case LCS_FORSHARE:
                        appendStringInfoString(buf, " FOR SHARE");
                        break;
                    case LCS_FORNOKEYUPDATE:
                    case LCS_FORUPDATE:
                        appendStringInfoString(buf, " FOR UPDATE");
                        break;
                }
 
                /* Add the relation alias if we are here for a join relation */
                if (bms_membership(rel->relids) == BMS_MULTIPLE &&
                    rc->strength != LCS_NONE)
                    appendStringInfo(buf, " OF %s%d", REL_ALIAS_PREFIX, relid);
            }
        }
    }
}

References PlannerInfo::all_result_relids, appendStringInfo(), appendStringInfoString(), bms_is_member(), bms_membership(), BMS_MULTIPLE, bms_next_member(), deparse_expr_cxt::buf, buf, CMD_DELETE, CMD_UPDATE, Query::commandType, RelOptInfo::fdw_private, get_plan_rowmark(), IS_JOIN_REL, LCS_FORKEYSHARE, LCS_FORNOKEYUPDATE, LCS_FORSHARE, LCS_FORUPDATE, LCS_NONE, PgFdwRelationInfo::lower_subquery_rels, PlannerInfo::parse, REL_ALIAS_PREFIX, RelOptInfo::relids, deparse_expr_cxt::root, PlannerInfo::rowMarks, deparse_expr_cxt::scanrel, PlanRowMark::strength, and while().

Referenced by deparseSelectStmtForRel().

deparseNullTest()

static void deparseNullTest ( NullTest *  node, deparse_expr_cxt *  context  )

static

Definition at line 3267 of file deparse.c.

{
    StringInfo  buf = context->buf;
 
    appendStringInfoChar(buf, '(');
    deparseExpr(node->arg, context);
 
    /*
     * For scalar inputs, we prefer to print as IS [NOT] NULL, which is
     * shorter and traditional.  If it's a rowtype input but we're applying a
     * scalar test, must print IS [NOT] DISTINCT FROM NULL to be semantically
     * correct.
     */
    if (node->argisrow || !type_is_rowtype(exprType((Node *) node->arg)))
    {
        if (node->nulltesttype == IS_NULL)
            appendStringInfoString(buf, " IS NULL)");
        else
            appendStringInfoString(buf, " IS NOT NULL)");
    }
    else
    {
        if (node->nulltesttype == IS_NULL)
            appendStringInfoString(buf, " IS NOT DISTINCT FROM NULL)");
        else
            appendStringInfoString(buf, " IS DISTINCT FROM NULL)");
    }
}

References appendStringInfoChar(), appendStringInfoString(), NullTest::arg, NullTest::argisrow, deparse_expr_cxt::buf, buf, deparseExpr(), exprType(), IS_NULL, NullTest::nulltesttype, and type_is_rowtype().

Referenced by deparseExpr().

deparseOperatorName()

static void deparseOperatorName ( StringInfo  buf, Form_pg_operator  opform  )

static

Definition at line 3125 of file deparse.c.

{
    char       *opname;
 
    /* opname is not a SQL identifier, so we should not quote it. */
    opname = NameStr(opform->oprname);
 
    /* Print schema name only if it's not pg_catalog */
    if (opform->oprnamespace != PG_CATALOG_NAMESPACE)
    {
        const char *opnspname;
 
        opnspname = get_namespace_name(opform->oprnamespace);
        /* Print fully qualified operator name. */
        appendStringInfo(buf, "OPERATOR(%s.%s)",
                         quote_identifier(opnspname), opname);
    }
    else
    {
        /* Just print operator name. */
        appendStringInfoString(buf, opname);
    }
}

References appendStringInfo(), appendStringInfoString(), buf, get_namespace_name(), NameStr, and quote_identifier().

Referenced by appendOrderBySuffix(), deparseOpExpr(), and deparseScalarArrayOpExpr().

deparseOpExpr()

static void deparseOpExpr ( OpExpr *  node, deparse_expr_cxt *  context  )

static

Definition at line 2995 of file deparse.c.

{
    StringInfo  buf = context->buf;
    HeapTuple   tuple;
    Form_pg_operator form;
    Expr       *right;
    bool        canSuppressRightConstCast = false;
    char        oprkind;
 
    /* Retrieve information about the operator from system catalog. */
    tuple = SearchSysCache1(OPEROID, ObjectIdGetDatum(node->opno));
    if (!HeapTupleIsValid(tuple))
        elog(ERROR, "cache lookup failed for operator %u", node->opno);
    form = (Form_pg_operator) GETSTRUCT(tuple);
    oprkind = form->oprkind;
 
    /* Sanity check. */
    Assert((oprkind == 'l' && list_length(node->args) == 1) ||
           (oprkind == 'b' && list_length(node->args) == 2));
 
    right = llast(node->args);
 
    /* Always parenthesize the expression. */
    appendStringInfoChar(buf, '(');
 
    /* Deparse left operand, if any. */
    if (oprkind == 'b')
    {
        Expr       *left = linitial(node->args);
        Oid         leftType = exprType((Node *) left);
        Oid         rightType = exprType((Node *) right);
        bool        canSuppressLeftConstCast = false;
 
        /*
         * When considering a binary operator, if one operand is a Const that
         * can be printed as a bare string literal or NULL (i.e., it will look
         * like type UNKNOWN to the remote parser), the Const normally
         * receives an explicit cast to the operator's input type.  However,
         * in Const-to-Var comparisons where both operands are of the same
         * type, we prefer to suppress the explicit cast, leaving the Const's
         * type resolution up to the remote parser.  The remote's resolution
         * heuristic will assume that an unknown input type being compared to
         * a known input type is of that known type as well.
         *
         * This hack allows some cases to succeed where a remote column is
         * declared with a different type in the local (foreign) table.  By
         * emitting "foreigncol = 'foo'" not "foreigncol = 'foo'::text" or the
         * like, we allow the remote parser to pick an "=" operator that's
         * compatible with whatever type the remote column really is, such as
         * an enum.
         *
         * We allow cast suppression to happen only when the other operand is
         * a plain foreign Var.  Although the remote's unknown-type heuristic
         * would apply to other cases just as well, we would be taking a
         * bigger risk that the inferred type is something unexpected.  With
         * this restriction, if anything goes wrong it's the user's fault for
         * not declaring the local column with the same type as the remote
         * column.
         */
        if (leftType == rightType)
        {
            if (IsA(left, Const))
                canSuppressLeftConstCast = isPlainForeignVar(right, context);
            else if (IsA(right, Const))
                canSuppressRightConstCast = isPlainForeignVar(left, context);
        }
 
        if (canSuppressLeftConstCast)
            deparseConst((Const *) left, context, -2);
        else
            deparseExpr(left, context);
 
        appendStringInfoChar(buf, ' ');
    }
 
    /* Deparse operator name. */
    deparseOperatorName(buf, form);
 
    /* Deparse right operand. */
    appendStringInfoChar(buf, ' ');
 
    if (canSuppressRightConstCast)
        deparseConst((Const *) right, context, -2);
    else
        deparseExpr(right, context);
 
    appendStringInfoChar(buf, ')');
 
    ReleaseSysCache(tuple);
}

References appendStringInfoChar(), OpExpr::args, Assert(), deparse_expr_cxt::buf, buf, deparseConst(), deparseExpr(), deparseOperatorName(), elog(), ERROR, exprType(), GETSTRUCT, HeapTupleIsValid, IsA, isPlainForeignVar(), linitial, list_length(), llast, ObjectIdGetDatum, OPEROID, OpExpr::opno, ReleaseSysCache(), and SearchSysCache1().

Referenced by deparseExpr().

deparseParam()

static void deparseParam ( Param *  node, deparse_expr_cxt *  context  )

static

Definition at line 2853 of file deparse.c.

{
    if (context->params_list)
    {
        int         pindex = 0;
        ListCell   *lc;
 
        /* find its index in params_list */
        foreach(lc, *context->params_list)
        {
            pindex++;
            if (equal(node, (Node *) lfirst(lc)))
                break;
        }
        if (lc == NULL)
        {
            /* not in list, so add it */
            pindex++;
            *context->params_list = lappend(*context->params_list, node);
        }
 
        printRemoteParam(pindex, node->paramtype, node->paramtypmod, context);
    }
    else
    {
        printRemotePlaceholder(node->paramtype, node->paramtypmod, context);
    }
}

References equal(), lappend(), lfirst, deparse_expr_cxt::params_list, Param::paramtype, Param::paramtypmod, printRemoteParam(), and printRemotePlaceholder().

Referenced by deparseExpr().

deparseRangeTblRef()

static void deparseRangeTblRef ( StringInfo  buf, PlannerInfo *  root, RelOptInfo *  foreignrel, bool  make_subquery, Index  ignore_rel, List **  ignore_conds, List **  params_list  )

static

Definition at line 1798 of file deparse.c.

{
    PgFdwRelationInfo *fpinfo = (PgFdwRelationInfo *) foreignrel->fdw_private;
 
    /* Should only be called in these cases. */
    Assert(IS_SIMPLE_REL(foreignrel) || IS_JOIN_REL(foreignrel));
 
    Assert(fpinfo->local_conds == NIL);
 
    /* If make_subquery is true, deparse the relation as a subquery. */
    if (make_subquery)
    {
        List       *retrieved_attrs;
        int         ncols;
 
        /*
         * The given relation shouldn't contain the target relation, because
         * this should only happen for input relations for a full join, and
         * such relations can never contain an UPDATE/DELETE target.
         */
        Assert(ignore_rel == 0 ||
               !bms_is_member(ignore_rel, foreignrel->relids));
 
        /* Deparse the subquery representing the relation. */
        appendStringInfoChar(buf, '(');
        deparseSelectStmtForRel(buf, root, foreignrel, NIL,
                                fpinfo->remote_conds, NIL,
                                false, false, true,
                                &retrieved_attrs, params_list);
        appendStringInfoChar(buf, ')');
 
        /* Append the relation alias. */
        appendStringInfo(buf, " %s%d", SUBQUERY_REL_ALIAS_PREFIX,
                         fpinfo->relation_index);
 
        /*
         * Append the column aliases if needed.  Note that the subquery emits
         * expressions specified in the relation's reltarget (see
         * deparseSubqueryTargetList).
         */
        ncols = list_length(foreignrel->reltarget->exprs);
        if (ncols > 0)
        {
            int         i;
 
            appendStringInfoChar(buf, '(');
            for (i = 1; i <= ncols; i++)
            {
                if (i > 1)
                    appendStringInfoString(buf, ", ");
 
                appendStringInfo(buf, "%s%d", SUBQUERY_COL_ALIAS_PREFIX, i);
            }
            appendStringInfoChar(buf, ')');
        }
    }
    else
        deparseFromExprForRel(buf, root, foreignrel, true, ignore_rel,
                              ignore_conds, params_list);
}

References appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), Assert(), bms_is_member(), buf, deparseFromExprForRel(), deparseSelectStmtForRel(), PathTarget::exprs, RelOptInfo::fdw_private, i, IS_JOIN_REL, IS_SIMPLE_REL, list_length(), PgFdwRelationInfo::local_conds, NIL, PgFdwRelationInfo::relation_index, RelOptInfo::relids, RelOptInfo::reltarget, PgFdwRelationInfo::remote_conds, SUBQUERY_COL_ALIAS_PREFIX, and SUBQUERY_REL_ALIAS_PREFIX.

Referenced by deparseFromExprForRel().

deparseRelabelType()

static void deparseRelabelType ( RelabelType *  node, deparse_expr_cxt *  context  )

static

Definition at line 3216 of file deparse.c.

{
    deparseExpr(node->arg, context);
    if (node->relabelformat != COERCE_IMPLICIT_CAST)
        appendStringInfo(context->buf, "::%s",
                         deparse_type_name(node->resulttype,
                                           node->resulttypmod));
}

References appendStringInfo(), RelabelType::arg, deparse_expr_cxt::buf, COERCE_IMPLICIT_CAST, deparse_type_name(), deparseExpr(), RelabelType::relabelformat, RelabelType::resulttype, and RelabelType::resulttypmod.

Referenced by deparseExpr().

deparseRelation()

static void deparseRelation ( StringInfo  buf, Relation  rel  )

static

Definition at line 2528 of file deparse.c.

{
    ForeignTable *table;
    const char *nspname = NULL;
    const char *relname = NULL;
    ListCell   *lc;
 
    /* obtain additional catalog information. */
    table = GetForeignTable(RelationGetRelid(rel));
 
    /*
     * Use value of FDW options if any, instead of the name of object itself.
     */
    foreach(lc, table->options)
    {
        DefElem    *def = (DefElem *) lfirst(lc);
 
        if (strcmp(def->defname, "schema_name") == 0)
            nspname = defGetString(def);
        else if (strcmp(def->defname, "table_name") == 0)
            relname = defGetString(def);
    }
 
    /*
     * Note: we could skip printing the schema name if it's pg_catalog, but
     * that doesn't seem worth the trouble.
     */
    if (nspname == NULL)
        nspname = get_namespace_name(RelationGetNamespace(rel));
    if (relname == NULL)
        relname = RelationGetRelationName(rel);
 
    appendStringInfo(buf, "%s.%s",
                     quote_identifier(nspname), quote_identifier(relname));
}

References appendStringInfo(), buf, defGetString(), DefElem::defname, get_namespace_name(), GetForeignTable(), lfirst, ForeignTable::options, quote_identifier(), RelationGetNamespace, RelationGetRelationName, RelationGetRelid, and relname.

Referenced by deparseAnalyzeSizeSql(), deparseAnalyzeSql(), deparseDeleteSql(), deparseDirectDeleteSql(), deparseDirectUpdateSql(), deparseFromExprForRel(), deparseInsertSql(), deparseTruncateSql(), and deparseUpdateSql().

deparseReturningList()

static void deparseReturningList ( StringInfo  buf, RangeTblEntry *  rte, Index  rtindex, Relation  rel, bool  trig_after_row, List *  withCheckOptionList, List *  returningList, List **  retrieved_attrs  )

static

Definition at line 2230 of file deparse.c.

{
    Bitmapset  *attrs_used = NULL;
 
    if (trig_after_row)
    {
        /* whole-row reference acquires all non-system columns */
        attrs_used =
            bms_make_singleton(0 - FirstLowInvalidHeapAttributeNumber);
    }
 
    if (withCheckOptionList != NIL)
    {
        /*
         * We need the attrs, non-system and system, mentioned in the local
         * query's WITH CHECK OPTION list.
         *
         * Note: we do this to ensure that WCO constraints will be evaluated
         * on the data actually inserted/updated on the remote side, which
         * might differ from the data supplied by the core code, for example
         * as a result of remote triggers.
         */
        pull_varattnos((Node *) withCheckOptionList, rtindex,
                       &attrs_used);
    }
 
    if (returningList != NIL)
    {
        /*
         * We need the attrs, non-system and system, mentioned in the local
         * query's RETURNING list.
         */
        pull_varattnos((Node *) returningList, rtindex,
                       &attrs_used);
    }
 
    if (attrs_used != NULL)
        deparseTargetList(buf, rte, rtindex, rel, true, attrs_used, false,
                          retrieved_attrs);
    else
        *retrieved_attrs = NIL;
}

References bms_make_singleton(), buf, deparseTargetList(), FirstLowInvalidHeapAttributeNumber, NIL, and pull_varattnos().

Referenced by deparseDeleteSql(), deparseDirectDeleteSql(), deparseDirectUpdateSql(), deparseInsertSql(), and deparseUpdateSql().

deparseScalarArrayOpExpr()

static void deparseScalarArrayOpExpr ( ScalarArrayOpExpr *  node, deparse_expr_cxt *  context  )

static

Definition at line 3171 of file deparse.c.

{
    StringInfo  buf = context->buf;
    HeapTuple   tuple;
    Form_pg_operator form;
    Expr       *arg1;
    Expr       *arg2;
 
    /* Retrieve information about the operator from system catalog. */
    tuple = SearchSysCache1(OPEROID, ObjectIdGetDatum(node->opno));
    if (!HeapTupleIsValid(tuple))
        elog(ERROR, "cache lookup failed for operator %u", node->opno);
    form = (Form_pg_operator) GETSTRUCT(tuple);
 
    /* Sanity check. */
    Assert(list_length(node->args) == 2);
 
    /* Always parenthesize the expression. */
    appendStringInfoChar(buf, '(');
 
    /* Deparse left operand. */
    arg1 = linitial(node->args);
    deparseExpr(arg1, context);
    appendStringInfoChar(buf, ' ');
 
    /* Deparse operator name plus decoration. */
    deparseOperatorName(buf, form);
    appendStringInfo(buf, " %s (", node->useOr ? "ANY" : "ALL");
 
    /* Deparse right operand. */
    arg2 = lsecond(node->args);
    deparseExpr(arg2, context);
 
    appendStringInfoChar(buf, ')');
 
    /* Always parenthesize the expression. */
    appendStringInfoChar(buf, ')');
 
    ReleaseSysCache(tuple);
}

References appendStringInfo(), appendStringInfoChar(), ScalarArrayOpExpr::args, Assert(), deparse_expr_cxt::buf, buf, deparseExpr(), deparseOperatorName(), elog(), ERROR, GETSTRUCT, HeapTupleIsValid, linitial, list_length(), lsecond, ObjectIdGetDatum, OPEROID, ScalarArrayOpExpr::opno, ReleaseSysCache(), SearchSysCache1(), and ScalarArrayOpExpr::useOr.

Referenced by deparseExpr().

deparseSelectSql()

static void deparseSelectSql ( List *  tlist, bool  is_subquery, List **  retrieved_attrs, deparse_expr_cxt *  context  )

static

Definition at line 1241 of file deparse.c.

{
    StringInfo  buf = context->buf;
    RelOptInfo *foreignrel = context->foreignrel;
    PlannerInfo *root = context->root;
    PgFdwRelationInfo *fpinfo = (PgFdwRelationInfo *) foreignrel->fdw_private;
 
    /*
     * Construct SELECT list
     */
    appendStringInfoString(buf, "SELECT ");
 
    if (is_subquery)
    {
        /*
         * For a relation that is deparsed as a subquery, emit expressions
         * specified in the relation's reltarget.  Note that since this is for
         * the subquery, no need to care about *retrieved_attrs.
         */
        deparseSubqueryTargetList(context);
    }
    else if (IS_JOIN_REL(foreignrel) || IS_UPPER_REL(foreignrel))
    {
        /*
         * For a join or upper relation the input tlist gives the list of
         * columns required to be fetched from the foreign server.
         */
        deparseExplicitTargetList(tlist, false, retrieved_attrs, context);
    }
    else
    {
        /*
         * For a base relation fpinfo->attrs_used gives the list of columns
         * required to be fetched from the foreign server.
         */
        RangeTblEntry *rte = planner_rt_fetch(foreignrel->relid, root);
 
        /*
         * Core code already has some lock on each rel being planned, so we
         * can use NoLock here.
         */
        Relation    rel = table_open(rte->relid, NoLock);
 
        deparseTargetList(buf, rte, foreignrel->relid, rel, false,
                          fpinfo->attrs_used, false, retrieved_attrs);
        table_close(rel, NoLock);
    }
}

References appendStringInfoString(), PgFdwRelationInfo::attrs_used, deparse_expr_cxt::buf, buf, deparseExplicitTargetList(), deparseSubqueryTargetList(), deparseTargetList(), RelOptInfo::fdw_private, deparse_expr_cxt::foreignrel, IS_JOIN_REL, IS_UPPER_REL, NoLock, planner_rt_fetch, RangeTblEntry::relid, RelOptInfo::relid, deparse_expr_cxt::root, table_close(), and table_open().

Referenced by deparseSelectStmtForRel().

deparseSelectStmtForRel()

void deparseSelectStmtForRel	(	StringInfo	buf,
		PlannerInfo *	root,
		RelOptInfo *	rel,
		List *	tlist,
		List *	remote_conds,
		List *	pathkeys,
		bool	has_final_sort,
		bool	has_limit,
		bool	is_subquery,
		List **	retrieved_attrs,
		List **	params_list
	)

Definition at line 1159 of file deparse.c.

{
    deparse_expr_cxt context;
    PgFdwRelationInfo *fpinfo = (PgFdwRelationInfo *) rel->fdw_private;
    List       *quals;
 
    /*
     * We handle relations for foreign tables, joins between those and upper
     * relations.
     */
    Assert(IS_JOIN_REL(rel) || IS_SIMPLE_REL(rel) || IS_UPPER_REL(rel));
 
    /* Fill portions of context common to upper, join and base relation */
    context.buf = buf;
    context.root = root;
    context.foreignrel = rel;
    context.scanrel = IS_UPPER_REL(rel) ? fpinfo->outerrel : rel;
    context.params_list = params_list;
 
    /* Construct SELECT clause */
    deparseSelectSql(tlist, is_subquery, retrieved_attrs, &context);
 
    /*
     * For upper relations, the WHERE clause is built from the remote
     * conditions of the underlying scan relation; otherwise, we can use the
     * supplied list of remote conditions directly.
     */
    if (IS_UPPER_REL(rel))
    {
        PgFdwRelationInfo *ofpinfo;
 
        ofpinfo = (PgFdwRelationInfo *) fpinfo->outerrel->fdw_private;
        quals = ofpinfo->remote_conds;
    }
    else
        quals = remote_conds;
 
    /* Construct FROM and WHERE clauses */
    deparseFromExpr(quals, &context);
 
    if (IS_UPPER_REL(rel))
    {
        /* Append GROUP BY clause */
        appendGroupByClause(tlist, &context);
 
        /* Append HAVING clause */
        if (remote_conds)
        {
            appendStringInfoString(buf, " HAVING ");
            appendConditions(remote_conds, &context);
        }
    }
 
    /* Add ORDER BY clause if we found any useful pathkeys */
    if (pathkeys)
        appendOrderByClause(pathkeys, has_final_sort, &context);
 
    /* Add LIMIT clause if necessary */
    if (has_limit)
        appendLimitClause(&context);
 
    /* Add any necessary FOR UPDATE/SHARE. */
    deparseLockingClause(&context);
}

References appendConditions(), appendGroupByClause(), appendLimitClause(), appendOrderByClause(), appendStringInfoString(), Assert(), deparse_expr_cxt::buf, buf, deparseFromExpr(), deparseLockingClause(), deparseSelectSql(), RelOptInfo::fdw_private, deparse_expr_cxt::foreignrel, IS_JOIN_REL, IS_SIMPLE_REL, IS_UPPER_REL, PgFdwRelationInfo::outerrel, deparse_expr_cxt::params_list, PgFdwRelationInfo::remote_conds, deparse_expr_cxt::root, and deparse_expr_cxt::scanrel.

Referenced by deparseRangeTblRef(), estimate_path_cost_size(), and postgresGetForeignPlan().

deparseSortGroupClause()

static Node * deparseSortGroupClause ( Index  ref, List *  tlist, bool  force_colno, deparse_expr_cxt *  context  )

static

Definition at line 3762 of file deparse.c.

{
    StringInfo  buf = context->buf;
    TargetEntry *tle;
    Expr       *expr;
 
    tle = get_sortgroupref_tle(ref, tlist);
    expr = tle->expr;
 
    if (force_colno)
    {
        /* Use column-number form when requested by caller. */
        Assert(!tle->resjunk);
        appendStringInfo(buf, "%d", tle->resno);
    }
    else if (expr && IsA(expr, Const))
    {
        /*
         * Force a typecast here so that we don't emit something like "GROUP
         * BY 2", which will be misconstrued as a column position rather than
         * a constant.
         */
        deparseConst((Const *) expr, context, 1);
    }
    else if (!expr || IsA(expr, Var))
        deparseExpr(expr, context);
    else
    {
        /* Always parenthesize the expression. */
        appendStringInfoChar(buf, '(');
        deparseExpr(expr, context);
        appendStringInfoChar(buf, ')');
    }
 
    return (Node *) expr;
}

References appendStringInfo(), appendStringInfoChar(), Assert(), deparse_expr_cxt::buf, buf, deparseConst(), deparseExpr(), TargetEntry::expr, get_sortgroupref_tle(), IsA, TargetEntry::resjunk, and TargetEntry::resno.

Referenced by appendAggOrderBy(), and appendGroupByClause().

deparseStringLiteral()

void deparseStringLiteral	(	StringInfo	buf,
		const char *	val
	)

Definition at line 2568 of file deparse.c.

{
    const char *valptr;
 
    /*
     * Rather than making assumptions about the remote server's value of
     * standard_conforming_strings, always use E'foo' syntax if there are any
     * backslashes.  This will fail on remote servers before 8.1, but those
     * are long out of support.
     */
    if (strchr(val, '\\') != NULL)
        appendStringInfoChar(buf, ESCAPE_STRING_SYNTAX);
    appendStringInfoChar(buf, '\'');
    for (valptr = val; *valptr; valptr++)
    {
        char        ch = *valptr;
 
        if (SQL_STR_DOUBLE(ch, true))
            appendStringInfoChar(buf, ch);
        appendStringInfoChar(buf, ch);
    }
    appendStringInfoChar(buf, '\'');
}

References appendStringInfoChar(), buf, ESCAPE_STRING_SYNTAX, SQL_STR_DOUBLE, and val.

Referenced by deparseAnalyzeSizeSql(), deparseConst(), and postgresImportForeignSchema().

deparseSubqueryTargetList()

static void deparseSubqueryTargetList ( deparse_expr_cxt *  context )

static

Definition at line 1606 of file deparse.c.

{
    StringInfo  buf = context->buf;
    RelOptInfo *foreignrel = context->foreignrel;
    bool        first;
    ListCell   *lc;
 
    /* Should only be called in these cases. */
    Assert(IS_SIMPLE_REL(foreignrel) || IS_JOIN_REL(foreignrel));
 
    first = true;
    foreach(lc, foreignrel->reltarget->exprs)
    {
        Node       *node = (Node *) lfirst(lc);
 
        if (!first)
            appendStringInfoString(buf, ", ");
        first = false;
 
        deparseExpr((Expr *) node, context);
    }
 
    /* Don't generate bad syntax if no expressions */
    if (first)
        appendStringInfoString(buf, "NULL");
}

References appendStringInfoString(), Assert(), deparse_expr_cxt::buf, buf, deparseExpr(), PathTarget::exprs, deparse_expr_cxt::foreignrel, IS_JOIN_REL, IS_SIMPLE_REL, lfirst, and RelOptInfo::reltarget.

Referenced by deparseSelectSql().

deparseSubscriptingRef()

static void deparseSubscriptingRef ( SubscriptingRef *  node, deparse_expr_cxt *  context  )

static

Definition at line 2886 of file deparse.c.

{
    StringInfo  buf = context->buf;
    ListCell   *lowlist_item;
    ListCell   *uplist_item;
 
    /* Always parenthesize the expression. */
    appendStringInfoChar(buf, '(');
 
    /*
     * Deparse referenced array expression first.  If that expression includes
     * a cast, we have to parenthesize to prevent the array subscript from
     * being taken as typename decoration.  We can avoid that in the typical
     * case of subscripting a Var, but otherwise do it.
     */
    if (IsA(node->refexpr, Var))
        deparseExpr(node->refexpr, context);
    else
    {
        appendStringInfoChar(buf, '(');
        deparseExpr(node->refexpr, context);
        appendStringInfoChar(buf, ')');
    }
 
    /* Deparse subscript expressions. */
    lowlist_item = list_head(node->reflowerindexpr);    /* could be NULL */
    foreach(uplist_item, node->refupperindexpr)
    {
        appendStringInfoChar(buf, '[');
        if (lowlist_item)
        {
            deparseExpr(lfirst(lowlist_item), context);
            appendStringInfoChar(buf, ':');
            lowlist_item = lnext(node->reflowerindexpr, lowlist_item);
        }
        deparseExpr(lfirst(uplist_item), context);
        appendStringInfoChar(buf, ']');
    }
 
    appendStringInfoChar(buf, ')');
}

References appendStringInfoChar(), deparse_expr_cxt::buf, buf, deparseExpr(), IsA, lfirst, list_head(), lnext(), SubscriptingRef::refexpr, SubscriptingRef::reflowerindexpr, and SubscriptingRef::refupperindexpr.

Referenced by deparseExpr().

deparseTargetList()

static void deparseTargetList ( StringInfo  buf, RangeTblEntry *  rte, Index  rtindex, Relation  rel, bool  is_returning, Bitmapset *  attrs_used, bool  qualify_col, List **  retrieved_attrs  )

static

Definition at line 1333 of file deparse.c.

{
    TupleDesc   tupdesc = RelationGetDescr(rel);
    bool        have_wholerow;
    bool        first;
    int         i;
 
    *retrieved_attrs = NIL;
 
    /* If there's a whole-row reference, we'll need all the columns. */
    have_wholerow = bms_is_member(0 - FirstLowInvalidHeapAttributeNumber,
                                  attrs_used);
 
    first = true;
    for (i = 1; i <= tupdesc->natts; i++)
    {
        Form_pg_attribute attr = TupleDescAttr(tupdesc, i - 1);
 
        /* Ignore dropped attributes. */
        if (attr->attisdropped)
            continue;
 
        if (have_wholerow ||
            bms_is_member(i - FirstLowInvalidHeapAttributeNumber,
                          attrs_used))
        {
            if (!first)
                appendStringInfoString(buf, ", ");
            else if (is_returning)
                appendStringInfoString(buf, " RETURNING ");
            first = false;
 
            deparseColumnRef(buf, rtindex, i, rte, qualify_col);
 
            *retrieved_attrs = lappend_int(*retrieved_attrs, i);
        }
    }
 
    /*
     * Add ctid if needed.  We currently don't support retrieving any other
     * system columns.
     */
    if (bms_is_member(SelfItemPointerAttributeNumber - FirstLowInvalidHeapAttributeNumber,
                      attrs_used))
    {
        if (!first)
            appendStringInfoString(buf, ", ");
        else if (is_returning)
            appendStringInfoString(buf, " RETURNING ");
        first = false;
 
        if (qualify_col)
            ADD_REL_QUALIFIER(buf, rtindex);
        appendStringInfoString(buf, "ctid");
 
        *retrieved_attrs = lappend_int(*retrieved_attrs,
                                       SelfItemPointerAttributeNumber);
    }
 
    /* Don't generate bad syntax if no undropped columns */
    if (first && !is_returning)
        appendStringInfoString(buf, "NULL");
}

References ADD_REL_QUALIFIER, appendStringInfoString(), bms_is_member(), buf, deparseColumnRef(), FirstLowInvalidHeapAttributeNumber, i, lappend_int(), TupleDescData::natts, NIL, RelationGetDescr, SelfItemPointerAttributeNumber, and TupleDescAttr.

Referenced by deparseColumnRef(), deparseReturningList(), and deparseSelectSql().

deparseTruncateSql()

void deparseTruncateSql	(	StringInfo	buf,
		List *	rels,
		DropBehavior	behavior,
		bool	restart_seqs
	)

Definition at line 2365 of file deparse.c.

{
    ListCell   *cell;
 
    appendStringInfoString(buf, "TRUNCATE ");
 
    foreach(cell, rels)
    {
        Relation    rel = lfirst(cell);
 
        if (cell != list_head(rels))
            appendStringInfoString(buf, ", ");
 
        deparseRelation(buf, rel);
    }
 
    appendStringInfo(buf, " %s IDENTITY",
                     restart_seqs ? "RESTART" : "CONTINUE");
 
    if (behavior == DROP_RESTRICT)
        appendStringInfoString(buf, " RESTRICT");
    else if (behavior == DROP_CASCADE)
        appendStringInfoString(buf, " CASCADE");
}

References appendStringInfo(), appendStringInfoString(), buf, deparseRelation(), DROP_CASCADE, DROP_RESTRICT, lfirst, and list_head().

Referenced by postgresExecForeignTruncate().

deparseUpdateSql()

void deparseUpdateSql	(	StringInfo	buf,
		RangeTblEntry *	rte,
		Index	rtindex,
		Relation	rel,
		List *	targetAttrs,
		List *	withCheckOptionList,
		List *	returningList,
		List **	retrieved_attrs
	)

Definition at line 2005 of file deparse.c.

{
    TupleDesc   tupdesc = RelationGetDescr(rel);
    AttrNumber  pindex;
    bool        first;
    ListCell   *lc;
 
    appendStringInfoString(buf, "UPDATE ");
    deparseRelation(buf, rel);
    appendStringInfoString(buf, " SET ");
 
    pindex = 2;                 /* ctid is always the first param */
    first = true;
    foreach(lc, targetAttrs)
    {
        int         attnum = lfirst_int(lc);
        Form_pg_attribute attr = TupleDescAttr(tupdesc, attnum - 1);
 
        if (!first)
            appendStringInfoString(buf, ", ");
        first = false;
 
        deparseColumnRef(buf, rtindex, attnum, rte, false);
        if (attr->attgenerated)
            appendStringInfoString(buf, " = DEFAULT");
        else
        {
            appendStringInfo(buf, " = $%d", pindex);
            pindex++;
        }
    }
    appendStringInfoString(buf, " WHERE ctid = $1");
 
    deparseReturningList(buf, rte, rtindex, rel,
                         rel->trigdesc && rel->trigdesc->trig_update_after_row,
                         withCheckOptionList, returningList, retrieved_attrs);
}

References appendStringInfo(), appendStringInfoString(), attnum, buf, deparseColumnRef(), deparseRelation(), deparseReturningList(), lfirst_int, RelationGetDescr, TriggerDesc::trig_update_after_row, RelationData::trigdesc, and TupleDescAttr.

Referenced by postgresPlanForeignModify().

deparseVar()

static void deparseVar ( Var *  node, deparse_expr_cxt *  context  )

static

Definition at line 2668 of file deparse.c.

{
    Relids      relids = context->scanrel->relids;
    int         relno;
    int         colno;
 
    /* Qualify columns when multiple relations are involved. */
    bool        qualify_col = (bms_membership(relids) == BMS_MULTIPLE);
 
    /*
     * If the Var belongs to the foreign relation that is deparsed as a
     * subquery, use the relation and column alias to the Var provided by the
     * subquery, instead of the remote name.
     */
    if (is_subquery_var(node, context->scanrel, &relno, &colno))
    {
        appendStringInfo(context->buf, "%s%d.%s%d",
                         SUBQUERY_REL_ALIAS_PREFIX, relno,
                         SUBQUERY_COL_ALIAS_PREFIX, colno);
        return;
    }
 
    if (bms_is_member(node->varno, relids) && node->varlevelsup == 0)
        deparseColumnRef(context->buf, node->varno, node->varattno,
                         planner_rt_fetch(node->varno, context->root),
                         qualify_col);
    else
    {
        /* Treat like a Param */
        if (context->params_list)
        {
            int         pindex = 0;
            ListCell   *lc;
 
            /* find its index in params_list */
            foreach(lc, *context->params_list)
            {
                pindex++;
                if (equal(node, (Node *) lfirst(lc)))
                    break;
            }
            if (lc == NULL)
            {
                /* not in list, so add it */
                pindex++;
                *context->params_list = lappend(*context->params_list, node);
            }
 
            printRemoteParam(pindex, node->vartype, node->vartypmod, context);
        }
        else
        {
            printRemotePlaceholder(node->vartype, node->vartypmod, context);
        }
    }
}

References appendStringInfo(), bms_is_member(), bms_membership(), BMS_MULTIPLE, deparse_expr_cxt::buf, deparseColumnRef(), equal(), is_subquery_var(), lappend(), lfirst, deparse_expr_cxt::params_list, planner_rt_fetch, printRemoteParam(), printRemotePlaceholder(), RelOptInfo::relids, deparse_expr_cxt::root, deparse_expr_cxt::scanrel, SUBQUERY_COL_ALIAS_PREFIX, SUBQUERY_REL_ALIAS_PREFIX, Var::varattno, Var::varlevelsup, Var::varno, Var::vartype, and Var::vartypmod.

Referenced by deparseExpr().

foreign_expr_walker()

static bool foreign_expr_walker ( Node *  node, foreign_glob_cxt *  glob_cxt, foreign_loc_cxt *  outer_cxt, foreign_loc_cxt *  case_arg_cxt  )

static

Definition at line 305 of file deparse.c.

{
    bool        check_type = true;
    PgFdwRelationInfo *fpinfo;
    foreign_loc_cxt inner_cxt;
    Oid         collation;
    FDWCollateState state;
 
    /* Need do nothing for empty subexpressions */
    if (node == NULL)
        return true;
 
    /* May need server info from baserel's fdw_private struct */
    fpinfo = (PgFdwRelationInfo *) (glob_cxt->foreignrel->fdw_private);
 
    /* Set up inner_cxt for possible recursion to child nodes */
    inner_cxt.collation = InvalidOid;
    inner_cxt.state = FDW_COLLATE_NONE;
 
    switch (nodeTag(node))
    {
        case T_Var:
            {
                Var        *var = (Var *) node;
 
                /*
                 * If the Var is from the foreign table, we consider its
                 * collation (if any) safe to use.  If it is from another
                 * table, we treat its collation the same way as we would a
                 * Param's collation, ie it's not safe for it to have a
                 * non-default collation.
                 */
                if (bms_is_member(var->varno, glob_cxt->relids) &&
                    var->varlevelsup == 0)
                {
                    /* Var belongs to foreign table */
 
                    /*
                     * System columns other than ctid should not be sent to
                     * the remote, since we don't make any effort to ensure
                     * that local and remote values match (tableoid, in
                     * particular, almost certainly doesn't match).
                     */
                    if (var->varattno < 0 &&
                        var->varattno != SelfItemPointerAttributeNumber)
                        return false;
 
                    /* Else check the collation */
                    collation = var->varcollid;
                    state = OidIsValid(collation) ? FDW_COLLATE_SAFE : FDW_COLLATE_NONE;
                }
                else
                {
                    /* Var belongs to some other table */
                    collation = var->varcollid;
                    if (collation == InvalidOid ||
                        collation == DEFAULT_COLLATION_OID)
                    {
                        /*
                         * It's noncollatable, or it's safe to combine with a
                         * collatable foreign Var, so set state to NONE.
                         */
                        state = FDW_COLLATE_NONE;
                    }
                    else
                    {
                        /*
                         * Do not fail right away, since the Var might appear
                         * in a collation-insensitive context.
                         */
                        state = FDW_COLLATE_UNSAFE;
                    }
                }
            }
            break;
        case T_Const:
            {
                Const      *c = (Const *) node;
 
                /*
                 * If the constant has nondefault collation, either it's of a
                 * non-builtin type, or it reflects folding of a CollateExpr.
                 * It's unsafe to send to the remote unless it's used in a
                 * non-collation-sensitive context.
                 */
                collation = c->constcollid;
                if (collation == InvalidOid ||
                    collation == DEFAULT_COLLATION_OID)
                    state = FDW_COLLATE_NONE;
                else
                    state = FDW_COLLATE_UNSAFE;
            }
            break;
        case T_Param:
            {
                Param      *p = (Param *) node;
 
                /*
                 * If it's a MULTIEXPR Param, punt.  We can't tell from here
                 * whether the referenced sublink/subplan contains any remote
                 * Vars; if it does, handling that is too complicated to
                 * consider supporting at present.  Fortunately, MULTIEXPR
                 * Params are not reduced to plain PARAM_EXEC until the end of
                 * planning, so we can easily detect this case.  (Normal
                 * PARAM_EXEC Params are safe to ship because their values
                 * come from somewhere else in the plan tree; but a MULTIEXPR
                 * references a sub-select elsewhere in the same targetlist,
                 * so we'd be on the hook to evaluate it somehow if we wanted
                 * to handle such cases as direct foreign updates.)
                 */
                if (p->paramkind == PARAM_MULTIEXPR)
                    return false;
 
                /*
                 * Collation rule is same as for Consts and non-foreign Vars.
                 */
                collation = p->paramcollid;
                if (collation == InvalidOid ||
                    collation == DEFAULT_COLLATION_OID)
                    state = FDW_COLLATE_NONE;
                else
                    state = FDW_COLLATE_UNSAFE;
            }
            break;
        case T_SubscriptingRef:
            {
                SubscriptingRef *sr = (SubscriptingRef *) node;
 
                /* Assignment should not be in restrictions. */
                if (sr->refassgnexpr != NULL)
                    return false;
 
                /*
                 * Recurse into the remaining subexpressions.  The container
                 * subscripts will not affect collation of the SubscriptingRef
                 * result, so do those first and reset inner_cxt afterwards.
                 */
                if (!foreign_expr_walker((Node *) sr->refupperindexpr,
                                         glob_cxt, &inner_cxt, case_arg_cxt))
                    return false;
                inner_cxt.collation = InvalidOid;
                inner_cxt.state = FDW_COLLATE_NONE;
                if (!foreign_expr_walker((Node *) sr->reflowerindexpr,
                                         glob_cxt, &inner_cxt, case_arg_cxt))
                    return false;
                inner_cxt.collation = InvalidOid;
                inner_cxt.state = FDW_COLLATE_NONE;
                if (!foreign_expr_walker((Node *) sr->refexpr,
                                         glob_cxt, &inner_cxt, case_arg_cxt))
                    return false;
 
                /*
                 * Container subscripting typically yields same collation as
                 * refexpr's, but in case it doesn't, use same logic as for
                 * function nodes.
                 */
                collation = sr->refcollid;
                if (collation == InvalidOid)
                    state = FDW_COLLATE_NONE;
                else if (inner_cxt.state == FDW_COLLATE_SAFE &&
                         collation == inner_cxt.collation)
                    state = FDW_COLLATE_SAFE;
                else if (collation == DEFAULT_COLLATION_OID)
                    state = FDW_COLLATE_NONE;
                else
                    state = FDW_COLLATE_UNSAFE;
            }
            break;
        case T_FuncExpr:
            {
                FuncExpr   *fe = (FuncExpr *) node;
 
                /*
                 * If function used by the expression is not shippable, it
                 * can't be sent to remote because it might have incompatible
                 * semantics on remote side.
                 */
                if (!is_shippable(fe->funcid, ProcedureRelationId, fpinfo))
                    return false;
 
                /*
                 * Recurse to input subexpressions.
                 */
                if (!foreign_expr_walker((Node *) fe->args,
                                         glob_cxt, &inner_cxt, case_arg_cxt))
                    return false;
 
                /*
                 * If function's input collation is not derived from a foreign
                 * Var, it can't be sent to remote.
                 */
                if (fe->inputcollid == InvalidOid)
                     /* OK, inputs are all noncollatable */ ;
                else if (inner_cxt.state != FDW_COLLATE_SAFE ||
                         fe->inputcollid != inner_cxt.collation)
                    return false;
 
                /*
                 * Detect whether node is introducing a collation not derived
                 * from a foreign Var.  (If so, we just mark it unsafe for now
                 * rather than immediately returning false, since the parent
                 * node might not care.)
                 */
                collation = fe->funccollid;
                if (collation == InvalidOid)
                    state = FDW_COLLATE_NONE;
                else if (inner_cxt.state == FDW_COLLATE_SAFE &&
                         collation == inner_cxt.collation)
                    state = FDW_COLLATE_SAFE;
                else if (collation == DEFAULT_COLLATION_OID)
                    state = FDW_COLLATE_NONE;
                else
                    state = FDW_COLLATE_UNSAFE;
            }
            break;
        case T_OpExpr:
        case T_DistinctExpr:    /* struct-equivalent to OpExpr */
            {
                OpExpr     *oe = (OpExpr *) node;
 
                /*
                 * Similarly, only shippable operators can be sent to remote.
                 * (If the operator is shippable, we assume its underlying
                 * function is too.)
                 */
                if (!is_shippable(oe->opno, OperatorRelationId, fpinfo))
                    return false;
 
                /*
                 * Recurse to input subexpressions.
                 */
                if (!foreign_expr_walker((Node *) oe->args,
                                         glob_cxt, &inner_cxt, case_arg_cxt))
                    return false;
 
                /*
                 * If operator's input collation is not derived from a foreign
                 * Var, it can't be sent to remote.
                 */
                if (oe->inputcollid == InvalidOid)
                     /* OK, inputs are all noncollatable */ ;
                else if (inner_cxt.state != FDW_COLLATE_SAFE ||
                         oe->inputcollid != inner_cxt.collation)
                    return false;
 
                /* Result-collation handling is same as for functions */
                collation = oe->opcollid;
                if (collation == InvalidOid)
                    state = FDW_COLLATE_NONE;
                else if (inner_cxt.state == FDW_COLLATE_SAFE &&
                         collation == inner_cxt.collation)
                    state = FDW_COLLATE_SAFE;
                else if (collation == DEFAULT_COLLATION_OID)
                    state = FDW_COLLATE_NONE;
                else
                    state = FDW_COLLATE_UNSAFE;
            }
            break;
        case T_ScalarArrayOpExpr:
            {
                ScalarArrayOpExpr *oe = (ScalarArrayOpExpr *) node;
 
                /*
                 * Again, only shippable operators can be sent to remote.
                 */
                if (!is_shippable(oe->opno, OperatorRelationId, fpinfo))
                    return false;
 
                /*
                 * Recurse to input subexpressions.
                 */
                if (!foreign_expr_walker((Node *) oe->args,
                                         glob_cxt, &inner_cxt, case_arg_cxt))
                    return false;
 
                /*
                 * If operator's input collation is not derived from a foreign
                 * Var, it can't be sent to remote.
                 */
                if (oe->inputcollid == InvalidOid)
                     /* OK, inputs are all noncollatable */ ;
                else if (inner_cxt.state != FDW_COLLATE_SAFE ||
                         oe->inputcollid != inner_cxt.collation)
                    return false;
 
                /* Output is always boolean and so noncollatable. */
                collation = InvalidOid;
                state = FDW_COLLATE_NONE;
            }
            break;
        case T_RelabelType:
            {
                RelabelType *r = (RelabelType *) node;
 
                /*
                 * Recurse to input subexpression.
                 */
                if (!foreign_expr_walker((Node *) r->arg,
                                         glob_cxt, &inner_cxt, case_arg_cxt))
                    return false;
 
                /*
                 * RelabelType must not introduce a collation not derived from
                 * an input foreign Var (same logic as for a real function).
                 */
                collation = r->resultcollid;
                if (collation == InvalidOid)
                    state = FDW_COLLATE_NONE;
                else if (inner_cxt.state == FDW_COLLATE_SAFE &&
                         collation == inner_cxt.collation)
                    state = FDW_COLLATE_SAFE;
                else if (collation == DEFAULT_COLLATION_OID)
                    state = FDW_COLLATE_NONE;
                else
                    state = FDW_COLLATE_UNSAFE;
            }
            break;
        case T_BoolExpr:
            {
                BoolExpr   *b = (BoolExpr *) node;
 
                /*
                 * Recurse to input subexpressions.
                 */
                if (!foreign_expr_walker((Node *) b->args,
                                         glob_cxt, &inner_cxt, case_arg_cxt))
                    return false;
 
                /* Output is always boolean and so noncollatable. */
                collation = InvalidOid;
                state = FDW_COLLATE_NONE;
            }
            break;
        case T_NullTest:
            {
                NullTest   *nt = (NullTest *) node;
 
                /*
                 * Recurse to input subexpressions.
                 */
                if (!foreign_expr_walker((Node *) nt->arg,
                                         glob_cxt, &inner_cxt, case_arg_cxt))
                    return false;
 
                /* Output is always boolean and so noncollatable. */
                collation = InvalidOid;
                state = FDW_COLLATE_NONE;
            }
            break;
        case T_CaseExpr:
            {
                CaseExpr   *ce = (CaseExpr *) node;
                foreign_loc_cxt arg_cxt;
                foreign_loc_cxt tmp_cxt;
                ListCell   *lc;
 
                /*
                 * Recurse to CASE's arg expression, if any.  Its collation
                 * has to be saved aside for use while examining CaseTestExprs
                 * within the WHEN expressions.
                 */
                arg_cxt.collation = InvalidOid;
                arg_cxt.state = FDW_COLLATE_NONE;
                if (ce->arg)
                {
                    if (!foreign_expr_walker((Node *) ce->arg,
                                             glob_cxt, &arg_cxt, case_arg_cxt))
                        return false;
                }
 
                /* Examine the CaseWhen subexpressions. */
                foreach(lc, ce->args)
                {
                    CaseWhen   *cw = lfirst_node(CaseWhen, lc);
 
                    if (ce->arg)
                    {
                        /*
                         * In a CASE-with-arg, the parser should have produced
                         * WHEN clauses of the form "CaseTestExpr = RHS",
                         * possibly with an implicit coercion inserted above
                         * the CaseTestExpr.  However in an expression that's
                         * been through the optimizer, the WHEN clause could
                         * be almost anything (since the equality operator
                         * could have been expanded into an inline function).
                         * In such cases forbid pushdown, because
                         * deparseCaseExpr can't handle it.
                         */
                        Node       *whenExpr = (Node *) cw->expr;
                        List       *opArgs;
 
                        if (!IsA(whenExpr, OpExpr))
                            return false;
 
                        opArgs = ((OpExpr *) whenExpr)->args;
                        if (list_length(opArgs) != 2 ||
                            !IsA(strip_implicit_coercions(linitial(opArgs)),
                                 CaseTestExpr))
                            return false;
                    }
 
                    /*
                     * Recurse to WHEN expression, passing down the arg info.
                     * Its collation doesn't affect the result (really, it
                     * should be boolean and thus not have a collation).
                     */
                    tmp_cxt.collation = InvalidOid;
                    tmp_cxt.state = FDW_COLLATE_NONE;
                    if (!foreign_expr_walker((Node *) cw->expr,
                                             glob_cxt, &tmp_cxt, &arg_cxt))
                        return false;
 
                    /* Recurse to THEN expression. */
                    if (!foreign_expr_walker((Node *) cw->result,
                                             glob_cxt, &inner_cxt, case_arg_cxt))
                        return false;
                }
 
                /* Recurse to ELSE expression. */
                if (!foreign_expr_walker((Node *) ce->defresult,
                                         glob_cxt, &inner_cxt, case_arg_cxt))
                    return false;
 
                /*
                 * Detect whether node is introducing a collation not derived
                 * from a foreign Var.  (If so, we just mark it unsafe for now
                 * rather than immediately returning false, since the parent
                 * node might not care.)  This is the same as for function
                 * nodes, except that the input collation is derived from only
                 * the THEN and ELSE subexpressions.
                 */
                collation = ce->casecollid;
                if (collation == InvalidOid)
                    state = FDW_COLLATE_NONE;
                else if (inner_cxt.state == FDW_COLLATE_SAFE &&
                         collation == inner_cxt.collation)
                    state = FDW_COLLATE_SAFE;
                else if (collation == DEFAULT_COLLATION_OID)
                    state = FDW_COLLATE_NONE;
                else
                    state = FDW_COLLATE_UNSAFE;
            }
            break;
        case T_CaseTestExpr:
            {
                CaseTestExpr *c = (CaseTestExpr *) node;
 
                /* Punt if we seem not to be inside a CASE arg WHEN. */
                if (!case_arg_cxt)
                    return false;
 
                /*
                 * Otherwise, any nondefault collation attached to the
                 * CaseTestExpr node must be derived from foreign Var(s) in
                 * the CASE arg.
                 */
                collation = c->collation;
                if (collation == InvalidOid)
                    state = FDW_COLLATE_NONE;
                else if (case_arg_cxt->state == FDW_COLLATE_SAFE &&
                         collation == case_arg_cxt->collation)
                    state = FDW_COLLATE_SAFE;
                else if (collation == DEFAULT_COLLATION_OID)
                    state = FDW_COLLATE_NONE;
                else
                    state = FDW_COLLATE_UNSAFE;
            }
            break;
        case T_ArrayExpr:
            {
                ArrayExpr  *a = (ArrayExpr *) node;
 
                /*
                 * Recurse to input subexpressions.
                 */
                if (!foreign_expr_walker((Node *) a->elements,
                                         glob_cxt, &inner_cxt, case_arg_cxt))
                    return false;
 
                /*
                 * ArrayExpr must not introduce a collation not derived from
                 * an input foreign Var (same logic as for a function).
                 */
                collation = a->array_collid;
                if (collation == InvalidOid)
                    state = FDW_COLLATE_NONE;
                else if (inner_cxt.state == FDW_COLLATE_SAFE &&
                         collation == inner_cxt.collation)
                    state = FDW_COLLATE_SAFE;
                else if (collation == DEFAULT_COLLATION_OID)
                    state = FDW_COLLATE_NONE;
                else
                    state = FDW_COLLATE_UNSAFE;
            }
            break;
        case T_List:
            {
                List       *l = (List *) node;
                ListCell   *lc;
 
                /*
                 * Recurse to component subexpressions.
                 */
                foreach(lc, l)
                {
                    if (!foreign_expr_walker((Node *) lfirst(lc),
                                             glob_cxt, &inner_cxt, case_arg_cxt))
                        return false;
                }
 
                /*
                 * When processing a list, collation state just bubbles up
                 * from the list elements.
                 */
                collation = inner_cxt.collation;
                state = inner_cxt.state;
 
                /* Don't apply exprType() to the list. */
                check_type = false;
            }
            break;
        case T_Aggref:
            {
                Aggref     *agg = (Aggref *) node;
                ListCell   *lc;
 
                /* Not safe to pushdown when not in grouping context */
                if (!IS_UPPER_REL(glob_cxt->foreignrel))
                    return false;
 
                /* Only non-split aggregates are pushable. */
                if (agg->aggsplit != AGGSPLIT_SIMPLE)
                    return false;
 
                /* As usual, it must be shippable. */
                if (!is_shippable(agg->aggfnoid, ProcedureRelationId, fpinfo))
                    return false;
 
                /*
                 * Recurse to input args. aggdirectargs, aggorder and
                 * aggdistinct are all present in args, so no need to check
                 * their shippability explicitly.
                 */
                foreach(lc, agg->args)
                {
                    Node       *n = (Node *) lfirst(lc);
 
                    /* If TargetEntry, extract the expression from it */
                    if (IsA(n, TargetEntry))
                    {
                        TargetEntry *tle = (TargetEntry *) n;
 
                        n = (Node *) tle->expr;
                    }
 
                    if (!foreign_expr_walker(n,
                                             glob_cxt, &inner_cxt, case_arg_cxt))
                        return false;
                }
 
                /*
                 * For aggorder elements, check whether the sort operator, if
                 * specified, is shippable or not.
                 */
                if (agg->aggorder)
                {
                    ListCell   *lc;
 
                    foreach(lc, agg->aggorder)
                    {
                        SortGroupClause *srt = (SortGroupClause *) lfirst(lc);
                        Oid         sortcoltype;
                        TypeCacheEntry *typentry;
                        TargetEntry *tle;
 
                        tle = get_sortgroupref_tle(srt->tleSortGroupRef,
                                                   agg->args);
                        sortcoltype = exprType((Node *) tle->expr);
                        typentry = lookup_type_cache(sortcoltype,
                                                     TYPECACHE_LT_OPR | TYPECACHE_GT_OPR);
                        /* Check shippability of non-default sort operator. */
                        if (srt->sortop != typentry->lt_opr &&
                            srt->sortop != typentry->gt_opr &&
                            !is_shippable(srt->sortop, OperatorRelationId,
                                          fpinfo))
                            return false;
                    }
                }
 
                /* Check aggregate filter */
                if (!foreign_expr_walker((Node *) agg->aggfilter,
                                         glob_cxt, &inner_cxt, case_arg_cxt))
                    return false;
 
                /*
                 * If aggregate's input collation is not derived from a
                 * foreign Var, it can't be sent to remote.
                 */
                if (agg->inputcollid == InvalidOid)
                     /* OK, inputs are all noncollatable */ ;
                else if (inner_cxt.state != FDW_COLLATE_SAFE ||
                         agg->inputcollid != inner_cxt.collation)
                    return false;
 
                /*
                 * Detect whether node is introducing a collation not derived
                 * from a foreign Var.  (If so, we just mark it unsafe for now
                 * rather than immediately returning false, since the parent
                 * node might not care.)
                 */
                collation = agg->aggcollid;
                if (collation == InvalidOid)
                    state = FDW_COLLATE_NONE;
                else if (inner_cxt.state == FDW_COLLATE_SAFE &&
                         collation == inner_cxt.collation)
                    state = FDW_COLLATE_SAFE;
                else if (collation == DEFAULT_COLLATION_OID)
                    state = FDW_COLLATE_NONE;
                else
                    state = FDW_COLLATE_UNSAFE;
            }
            break;
        default:
 
            /*
             * If it's anything else, assume it's unsafe.  This list can be
             * expanded later, but don't forget to add deparse support below.
             */
            return false;
    }
 
    /*
     * If result type of given expression is not shippable, it can't be sent
     * to remote because it might have incompatible semantics on remote side.
     */
    if (check_type && !is_shippable(exprType(node), TypeRelationId, fpinfo))
        return false;
 
    /*
     * Now, merge my collation information into my parent's state.
     */
    if (state > outer_cxt->state)
    {
        /* Override previous parent state */
        outer_cxt->collation = collation;
        outer_cxt->state = state;
    }
    else if (state == outer_cxt->state)
    {
        /* Merge, or detect error if there's a collation conflict */
        switch (state)
        {
            case FDW_COLLATE_NONE:
                /* Nothing + nothing is still nothing */
                break;
            case FDW_COLLATE_SAFE:
                if (collation != outer_cxt->collation)
                {
                    /*
                     * Non-default collation always beats default.
                     */
                    if (outer_cxt->collation == DEFAULT_COLLATION_OID)
                    {
                        /* Override previous parent state */
                        outer_cxt->collation = collation;
                    }
                    else if (collation != DEFAULT_COLLATION_OID)
                    {
                        /*
                         * Conflict; show state as indeterminate.  We don't
                         * want to "return false" right away, since parent
                         * node might not care about collation.
                         */
                        outer_cxt->state = FDW_COLLATE_UNSAFE;
                    }
                }
                break;
            case FDW_COLLATE_UNSAFE:
                /* We're still conflicted ... */
                break;
        }
    }
 
    /* It looks OK */
    return true;
}

References a, Aggref::aggcollid, Aggref::aggfilter, Aggref::aggfnoid, Aggref::aggorder, Aggref::aggsplit, AGGSPLIT_SIMPLE, RelabelType::arg, CaseExpr::arg, NullTest::arg, Aggref::args, OpExpr::args, ScalarArrayOpExpr::args, CaseExpr::args, b, bms_is_member(), CaseExpr::casecollid, foreign_loc_cxt::collation, CaseExpr::defresult, CaseWhen::expr, TargetEntry::expr, exprType(), FDW_COLLATE_NONE, FDW_COLLATE_SAFE, FDW_COLLATE_UNSAFE, RelOptInfo::fdw_private, fe(), foreign_glob_cxt::foreignrel, get_sortgroupref_tle(), TypeCacheEntry::gt_opr, if(), Aggref::inputcollid, OpExpr::inputcollid, ScalarArrayOpExpr::inputcollid, InvalidOid, is_shippable(), IS_UPPER_REL, IsA, lfirst, lfirst_node, linitial, list_length(), lookup_type_cache(), TypeCacheEntry::lt_opr, nodeTag, OidIsValid, OpExpr::opcollid, OpExpr::opno, ScalarArrayOpExpr::opno, PARAM_MULTIEXPR, Param::paramcollid, Param::paramkind, SubscriptingRef::refassgnexpr, SubscriptingRef::refcollid, SubscriptingRef::refexpr, SubscriptingRef::reflowerindexpr, SubscriptingRef::refupperindexpr, foreign_glob_cxt::relids, CaseWhen::result, RelabelType::resultcollid, SelfItemPointerAttributeNumber, SortGroupClause::sortop, foreign_loc_cxt::state, strip_implicit_coercions(), T_Aggref, T_ArrayExpr, T_BoolExpr, T_CaseExpr, T_CaseTestExpr, T_Const, T_DistinctExpr, T_FuncExpr, T_List, T_NullTest, T_OpExpr, T_Param, T_RelabelType, T_ScalarArrayOpExpr, T_SubscriptingRef, T_Var, SortGroupClause::tleSortGroupRef, TYPECACHE_GT_OPR, TYPECACHE_LT_OPR, Var::varattno, Var::varcollid, Var::varlevelsup, and Var::varno.

Referenced by is_foreign_expr().

get_jointype_name()

const char* get_jointype_name

(

JoinType

jointype

)

Definition at line 1533 of file deparse.c.

{
    switch (jointype)
    {
        case JOIN_INNER:
            return "INNER";
 
        case JOIN_LEFT:
            return "LEFT";
 
        case JOIN_RIGHT:
            return "RIGHT";
 
        case JOIN_FULL:
            return "FULL";
 
        default:
            /* Shouldn't come here, but protect from buggy code. */
            elog(ERROR, "unsupported join type %d", jointype);
    }
 
    /* Keep compiler happy */
    return NULL;
}

References elog(), ERROR, JOIN_FULL, JOIN_INNER, JOIN_LEFT, and JOIN_RIGHT.

Referenced by deparseFromExprForRel(), and foreign_join_ok().

get_relation_column_alias_ids()

static void get_relation_column_alias_ids ( Var *  node, RelOptInfo *  foreignrel, int *  relno, int *  colno  )

static

Definition at line 3869 of file deparse.c.

{
    PgFdwRelationInfo *fpinfo = (PgFdwRelationInfo *) foreignrel->fdw_private;
    int         i;
    ListCell   *lc;
 
    /* Get the relation alias ID */
    *relno = fpinfo->relation_index;
 
    /* Get the column alias ID */
    i = 1;
    foreach(lc, foreignrel->reltarget->exprs)
    {
        if (equal(lfirst(lc), (Node *) node))
        {
            *colno = i;
            return;
        }
        i++;
    }
 
    /* Shouldn't get here */
    elog(ERROR, "unexpected expression in subquery output");
}

References elog(), equal(), ERROR, PathTarget::exprs, RelOptInfo::fdw_private, i, lfirst, PgFdwRelationInfo::relation_index, and RelOptInfo::reltarget.

Referenced by is_subquery_var().

is_foreign_expr()

bool is_foreign_expr	(	PlannerInfo *	root,
		RelOptInfo *	baserel,
		Expr *	expr
	)

Definition at line 237 of file deparse.c.

{
    foreign_glob_cxt glob_cxt;
    foreign_loc_cxt loc_cxt;
    PgFdwRelationInfo *fpinfo = (PgFdwRelationInfo *) (baserel->fdw_private);
 
    /*
     * Check that the expression consists of nodes that are safe to execute
     * remotely.
     */
    glob_cxt.root = root;
    glob_cxt.foreignrel = baserel;
 
    /*
     * For an upper relation, use relids from its underneath scan relation,
     * because the upperrel's own relids currently aren't set to anything
     * meaningful by the core code.  For other relation, use their own relids.
     */
    if (IS_UPPER_REL(baserel))
        glob_cxt.relids = fpinfo->outerrel->relids;
    else
        glob_cxt.relids = baserel->relids;
    loc_cxt.collation = InvalidOid;
    loc_cxt.state = FDW_COLLATE_NONE;
    if (!foreign_expr_walker((Node *) expr, &glob_cxt, &loc_cxt, NULL))
        return false;
 
    /*
     * If the expression has a valid collation that does not arise from a
     * foreign var, the expression can not be sent over.
     */
    if (loc_cxt.state == FDW_COLLATE_UNSAFE)
        return false;
 
    /*
     * An expression which includes any mutable functions can't be sent over
     * because its result is not stable.  For example, sending now() remote
     * side could cause confusion from clock offsets.  Future versions might
     * be able to make this choice with more granularity.  (We check this last
     * because it requires a lot of expensive catalog lookups.)
     */
    if (contain_mutable_functions((Node *) expr))
        return false;
 
    /* OK to evaluate on the remote server */
    return true;
}

References foreign_loc_cxt::collation, contain_mutable_functions(), FDW_COLLATE_NONE, FDW_COLLATE_UNSAFE, RelOptInfo::fdw_private, foreign_expr_walker(), foreign_glob_cxt::foreignrel, if(), InvalidOid, IS_UPPER_REL, PgFdwRelationInfo::outerrel, foreign_glob_cxt::relids, RelOptInfo::relids, foreign_glob_cxt::root, and foreign_loc_cxt::state.

Referenced by add_foreign_final_paths(), classifyConditions(), find_em_for_rel(), find_em_for_rel_target(), foreign_grouping_ok(), foreign_join_ok(), postgresGetForeignPaths(), postgresGetForeignPlan(), and postgresPlanDirectModify().

is_foreign_param()

bool is_foreign_param	(	PlannerInfo *	root,
		RelOptInfo *	baserel,
		Expr *	expr
	)

Definition at line 1008 of file deparse.c.

{
    if (expr == NULL)
        return false;
 
    switch (nodeTag(expr))
    {
        case T_Var:
            {
                /* It would have to be sent unless it's a foreign Var */
                Var        *var = (Var *) expr;
                PgFdwRelationInfo *fpinfo = (PgFdwRelationInfo *) (baserel->fdw_private);
                Relids      relids;
 
                if (IS_UPPER_REL(baserel))
                    relids = fpinfo->outerrel->relids;
                else
                    relids = baserel->relids;
 
                if (bms_is_member(var->varno, relids) && var->varlevelsup == 0)
                    return false;   /* foreign Var, so not a param */
                else
                    return true;    /* it'd have to be a param */
                break;
            }
        case T_Param:
            /* Params always have to be sent to the foreign server */
            return true;
        default:
            break;
    }
    return false;
}

References bms_is_member(), RelOptInfo::fdw_private, if(), IS_UPPER_REL, nodeTag, PgFdwRelationInfo::outerrel, RelOptInfo::relids, T_Param, T_Var, Var::varlevelsup, and Var::varno.

Referenced by foreign_grouping_ok().

is_foreign_pathkey()

bool is_foreign_pathkey	(	PlannerInfo *	root,
		RelOptInfo *	baserel,
		PathKey *	pathkey
	)

Definition at line 1049 of file deparse.c.

{
    EquivalenceClass *pathkey_ec = pathkey->pk_eclass;
    PgFdwRelationInfo *fpinfo = (PgFdwRelationInfo *) baserel->fdw_private;
 
    /*
     * is_foreign_expr would detect volatile expressions as well, but checking
     * ec_has_volatile here saves some cycles.
     */
    if (pathkey_ec->ec_has_volatile)
        return false;
 
    /* can't push down the sort if the pathkey's opfamily is not shippable */
    if (!is_shippable(pathkey->pk_opfamily, OperatorFamilyRelationId, fpinfo))
        return false;
 
    /* can push if a suitable EC member exists */
    return (find_em_for_rel(root, pathkey_ec, baserel) != NULL);
}

References EquivalenceClass::ec_has_volatile, RelOptInfo::fdw_private, find_em_for_rel(), if(), is_shippable(), PathKey::pk_eclass, and PathKey::pk_opfamily.

Referenced by get_useful_pathkeys_for_relation().

is_subquery_var()

static bool is_subquery_var ( Var *  node, RelOptInfo *  foreignrel, int *  relno, int *  colno  )

static

Definition at line 3807 of file deparse.c.

{
    PgFdwRelationInfo *fpinfo = (PgFdwRelationInfo *) foreignrel->fdw_private;
    RelOptInfo *outerrel = fpinfo->outerrel;
    RelOptInfo *innerrel = fpinfo->innerrel;
 
    /* Should only be called in these cases. */
    Assert(IS_SIMPLE_REL(foreignrel) || IS_JOIN_REL(foreignrel));
 
    /*
     * If the given relation isn't a join relation, it doesn't have any lower
     * subqueries, so the Var isn't a subquery output column.
     */
    if (!IS_JOIN_REL(foreignrel))
        return false;
 
    /*
     * If the Var doesn't belong to any lower subqueries, it isn't a subquery
     * output column.
     */
    if (!bms_is_member(node->varno, fpinfo->lower_subquery_rels))
        return false;
 
    if (bms_is_member(node->varno, outerrel->relids))
    {
        /*
         * If outer relation is deparsed as a subquery, the Var is an output
         * column of the subquery; get the IDs for the relation/column alias.
         */
        if (fpinfo->make_outerrel_subquery)
        {
            get_relation_column_alias_ids(node, outerrel, relno, colno);
            return true;
        }
 
        /* Otherwise, recurse into the outer relation. */
        return is_subquery_var(node, outerrel, relno, colno);
    }
    else
    {
        Assert(bms_is_member(node->varno, innerrel->relids));
 
        /*
         * If inner relation is deparsed as a subquery, the Var is an output
         * column of the subquery; get the IDs for the relation/column alias.
         */
        if (fpinfo->make_innerrel_subquery)
        {
            get_relation_column_alias_ids(node, innerrel, relno, colno);
            return true;
        }
 
        /* Otherwise, recurse into the inner relation. */
        return is_subquery_var(node, innerrel, relno, colno);
    }
}

References Assert(), bms_is_member(), RelOptInfo::fdw_private, get_relation_column_alias_ids(), PgFdwRelationInfo::innerrel, IS_JOIN_REL, IS_SIMPLE_REL, PgFdwRelationInfo::lower_subquery_rels, PgFdwRelationInfo::make_innerrel_subquery, PgFdwRelationInfo::make_outerrel_subquery, PgFdwRelationInfo::outerrel, and Var::varno.

Referenced by deparseVar().

isPlainForeignVar()

static bool isPlainForeignVar ( Expr *  node, deparse_expr_cxt *  context  )

static

Definition at line 3090 of file deparse.c.

{
    /*
     * We allow the foreign Var to have an implicit RelabelType, mainly so
     * that this'll work with varchar columns.  Note that deparseRelabelType
     * will not print such a cast, so we're not breaking the restriction that
     * the expression print as a plain Var.  We won't risk it for an implicit
     * cast that requires a function, nor for non-implicit RelabelType; such
     * cases seem too likely to involve semantics changes compared to what
     * would happen on the remote side.
     */
    if (IsA(node, RelabelType) &&
        ((RelabelType *) node)->relabelformat == COERCE_IMPLICIT_CAST)
        node = ((RelabelType *) node)->arg;
 
    if (IsA(node, Var))
    {
        /*
         * The Var must be one that'll deparse as a foreign column reference
         * (cf. deparseVar).
         */
        Var        *var = (Var *) node;
        Relids      relids = context->scanrel->relids;
 
        if (bms_is_member(var->varno, relids) && var->varlevelsup == 0)
            return true;
    }
 
    return false;
}

References bms_is_member(), COERCE_IMPLICIT_CAST, IsA, RelOptInfo::relids, deparse_expr_cxt::scanrel, Var::varlevelsup, and Var::varno.

Referenced by deparseOpExpr().

printRemoteParam()

static void printRemoteParam ( int  paramindex, Oid  paramtype, int32  paramtypmod, deparse_expr_cxt *  context  )

static

Definition at line 3542 of file deparse.c.

{
    StringInfo  buf = context->buf;
    char       *ptypename = deparse_type_name(paramtype, paramtypmod);
 
    appendStringInfo(buf, "$%d::%s", paramindex, ptypename);
}

References appendStringInfo(), deparse_expr_cxt::buf, buf, and deparse_type_name().

Referenced by deparseParam(), and deparseVar().

printRemotePlaceholder()

static void printRemotePlaceholder ( Oid  paramtype, int32  paramtypmod, deparse_expr_cxt *  context  )

static

Definition at line 3568 of file deparse.c.

{
    StringInfo  buf = context->buf;
    char       *ptypename = deparse_type_name(paramtype, paramtypmod);
 
    appendStringInfo(buf, "((SELECT null::%s)::%s)", ptypename, ptypename);
}

References appendStringInfo(), deparse_expr_cxt::buf, buf, and deparse_type_name().

Referenced by deparseParam(), and deparseVar().

rebuildInsertSql()

void rebuildInsertSql	(	StringInfo	buf,
		Relation	rel,
		char *	orig_query,
		List *	target_attrs,
		int	values_end_len,
		int	num_params,
		int	num_rows
	)

Definition at line 1945 of file deparse.c.

{
    TupleDesc   tupdesc = RelationGetDescr(rel);
    int         i;
    int         pindex;
    bool        first;
    ListCell   *lc;
 
    /* Make sure the values_end_len is sensible */
    Assert((values_end_len > 0) && (values_end_len <= strlen(orig_query)));
 
    /* Copy up to the end of the first record from the original query */
    appendBinaryStringInfo(buf, orig_query, values_end_len);
 
    /*
     * Add records to VALUES clause (we already have parameters for the first
     * row, so start at the right offset).
     */
    pindex = num_params + 1;
    for (i = 0; i < num_rows; i++)
    {
        appendStringInfoString(buf, ", (");
 
        first = true;
        foreach(lc, target_attrs)
        {
            int         attnum = lfirst_int(lc);
            Form_pg_attribute attr = TupleDescAttr(tupdesc, attnum - 1);
 
            if (!first)
                appendStringInfoString(buf, ", ");
            first = false;
 
            if (attr->attgenerated)
                appendStringInfoString(buf, "DEFAULT");
            else
            {
                appendStringInfo(buf, "$%d", pindex);
                pindex++;
            }
        }
 
        appendStringInfoChar(buf, ')');
    }
 
    /* Copy stuff after VALUES clause from the original query */
    appendStringInfoString(buf, orig_query + values_end_len);
}

References appendBinaryStringInfo(), appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), Assert(), attnum, buf, i, lfirst_int, RelationGetDescr, and TupleDescAttr.

Referenced by execute_foreign_modify().