deparse.c File Reference

#include "postgres.h"
#include "postgres_fdw.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "access/sysattr.h"
#include "catalog/pg_aggregate.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_operator.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/clauses.h"
#include "optimizer/prep.h"
#include "optimizer/tlist.h"
#include "optimizer/var.h"
#include "parser/parsetree.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#include "utils/syscache.h"
#include "utils/typcache.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)
static char *	deparse_type_name (Oid type_oid, int32 typemod)
static void	deparseTargetList (StringInfo buf, PlannerInfo *root, Index rtindex, Relation rel, bool is_returning, Bitmapset *attrs_used, bool qualify_col, List **retrieved_attrs)
static void	deparseExplicitTargetList (List *tlist, List **retrieved_attrs, deparse_expr_cxt *context)
static void	deparseSubqueryTargetList (deparse_expr_cxt *context)
static void	deparseReturningList (StringInfo buf, PlannerInfo *root, Index rtindex, Relation rel, bool trig_after_row, List *returningList, List **retrieved_attrs)
static void	deparseColumnRef (StringInfo buf, int varno, int varattno, PlannerInfo *root, 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	deparseArrayRef (ArrayRef *node, deparse_expr_cxt *context)
static void	deparseFuncExpr (FuncExpr *node, deparse_expr_cxt *context)
static void	deparseOpExpr (OpExpr *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	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, deparse_expr_cxt *context)
static void	appendConditions (List *exprs, deparse_expr_cxt *context)
static void	deparseFromExprForRel (StringInfo buf, PlannerInfo *root, RelOptInfo *joinrel, bool use_alias, List **params_list)
static void	deparseFromExpr (List *quals, deparse_expr_cxt *context)
static void	deparseRangeTblRef (StringInfo buf, PlannerInfo *root, RelOptInfo *foreignrel, bool make_subquery, List **params_list)
static void	deparseAggref (Aggref *node, deparse_expr_cxt *context)
static void	appendGroupByClause (List *tlist, 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, 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)
List *	build_tlist_to_deparse (RelOptInfo *foreignrel)
void	deparseSelectStmtForRel (StringInfo buf, PlannerInfo *root, RelOptInfo *rel, List *tlist, List *remote_conds, List *pathkeys, bool is_subquery, List **retrieved_attrs, List **params_list)
const char *	get_jointype_name (JoinType jointype)
void	deparseInsertSql (StringInfo buf, PlannerInfo *root, Index rtindex, Relation rel, List *targetAttrs, bool doNothing, List *returningList, List **retrieved_attrs)
void	deparseUpdateSql (StringInfo buf, PlannerInfo *root, Index rtindex, Relation rel, List *targetAttrs, List *returningList, List **retrieved_attrs)
void	deparseDirectUpdateSql (StringInfo buf, PlannerInfo *root, Index rtindex, Relation rel, List *targetlist, List *targetAttrs, List *remote_conds, List **params_list, List *returningList, List **retrieved_attrs)
void	deparseDeleteSql (StringInfo buf, PlannerInfo *root, Index rtindex, Relation rel, List *returningList, List **retrieved_attrs)
void	deparseDirectDeleteSql (StringInfo buf, PlannerInfo *root, Index rtindex, Relation rel, 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	deparseStringLiteral (StringInfo buf, const char *val)

Macro Definition Documentation

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

Definition at line 110 of file deparse.c.

Referenced by deparseColumnRef(), and deparseTargetList().

#define REL_ALIAS_PREFIX   "r"

Definition at line 108 of file deparse.c.

Referenced by deparseFromExprForRel(), and deparseLockingClause().

#define SUBQUERY_COL_ALIAS_PREFIX   "c"

Definition at line 113 of file deparse.c.

Referenced by deparseRangeTblRef(), and deparseVar().

#define SUBQUERY_REL_ALIAS_PREFIX   "s"

Definition at line 112 of file deparse.c.

Referenced by deparseRangeTblRef(), and deparseVar().

Typedef Documentation

typedef struct deparse_expr_cxt deparse_expr_cxt

typedef struct foreign_glob_cxt foreign_glob_cxt

typedef struct foreign_loc_cxt foreign_loc_cxt

Enumeration Type Documentation

enum FDWCollateState

Enumerator
FDW_COLLATE_NONE
FDW_COLLATE_SAFE
FDW_COLLATE_UNSAFE

Definition at line 78 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

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

static

Definition at line 2838 of file deparse.c.

References appendStringInfoString(), buf, deparse_expr_cxt::buf, deparseOperatorName(), deparseSortGroupClause(), elog, ERROR, exprType(), GETSTRUCT, TypeCacheEntry::gt_opr, HeapTupleIsValid, lfirst, lookup_type_cache(), TypeCacheEntry::lt_opr, SortGroupClause::nulls_first, ObjectIdGetDatum, OPEROID, ReleaseSysCache(), SearchSysCache1, SortGroupClause::sortop, SortGroupClause::tleSortGroupRef, TYPECACHE_GT_OPR, and TYPECACHE_LT_OPR.

Referenced by deparseAggref().

{
    StringInfo  buf = context->buf;
    ListCell   *lc;
    bool        first = true;

    foreach(lc, orderList)
    {
        SortGroupClause *srt = (SortGroupClause *) lfirst(lc);
        Node       *sortexpr;
        Oid         sortcoltype;
        TypeCacheEntry *typentry;

        if (!first)
            appendStringInfoString(buf, ", ");
        first = false;

        sortexpr = deparseSortGroupClause(srt->tleSortGroupRef, targetList,
                                          context);
        sortcoltype = exprType(sortexpr);
        /* See whether operator is default < or > for datatype */
        typentry = lookup_type_cache(sortcoltype,
                                     TYPECACHE_LT_OPR | TYPECACHE_GT_OPR);
        if (srt->sortop == typentry->lt_opr)
            appendStringInfoString(buf, " ASC");
        else if (srt->sortop == typentry->gt_opr)
            appendStringInfoString(buf, " DESC");
        else
        {
            HeapTuple   opertup;
            Form_pg_operator operform;

            appendStringInfoString(buf, " USING ");

            /* Append operator name. */
            opertup = SearchSysCache1(OPEROID, ObjectIdGetDatum(srt->sortop));
            if (!HeapTupleIsValid(opertup))
                elog(ERROR, "cache lookup failed for operator %u", srt->sortop);
            operform = (Form_pg_operator) GETSTRUCT(opertup);
            deparseOperatorName(buf, operform);
            ReleaseSysCache(opertup);
        }

        if (srt->nulls_first)
            appendStringInfoString(buf, " NULLS FIRST");
        else
            appendStringInfoString(buf, " NULLS LAST");
    }
}

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

static

Definition at line 1277 of file deparse.c.

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

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

{
    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);
}

static void appendFunctionName ( Oid  funcid, deparse_expr_cxt *  context  )

static

Definition at line 3015 of file deparse.c.

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

Referenced by deparseAggref(), and deparseFuncExpr().

{
    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);
}

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

static

Definition at line 2936 of file deparse.c.

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

Referenced by deparseSelectStmtForRel().

{
    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, context);
    }
}

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

static

Definition at line 2973 of file deparse.c.

References appendStringInfoString(), Assert, BTLessStrategyNumber, buf, deparse_expr_cxt::buf, deparseExpr(), find_em_expr_for_rel(), lfirst, PathKey::pk_eclass, PathKey::pk_nulls_first, PathKey::pk_strategy, reset_transmission_modes(), deparse_expr_cxt::scanrel, and set_transmission_modes().

Referenced by deparseSelectStmtForRel().

{
    ListCell   *lcell;
    int         nestlevel;
    char       *delim = " ";
    RelOptInfo *baserel = context->scanrel;
    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);
        Expr       *em_expr;

        em_expr = find_em_expr_for_rel(pathkey->pk_eclass, baserel);
        Assert(em_expr != NULL);

        appendStringInfoString(buf, delim);
        deparseExpr(em_expr, context);
        if (pathkey->pk_strategy == BTLessStrategyNumber)
            appendStringInfoString(buf, " ASC");
        else
            appendStringInfoString(buf, " DESC");

        if (pathkey->pk_nulls_first)
            appendStringInfoString(buf, " NULLS FIRST");
        else
            appendStringInfoString(buf, " NULLS LAST");

        delim = ", ";
    }
    reset_transmission_modes(nestlevel);
}

List* build_tlist_to_deparse

(

RelOptInfo *

foreignrel

)

Definition at line 868 of file deparse.c.

References add_to_flat_tlist(), RestrictInfo::clause, PathTarget::exprs, RelOptInfo::fdw_private, PgFdwRelationInfo::grouped_tlist, 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().

{
    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;
}

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

Definition at line 200 of file deparse.c.

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

Referenced by estimate_path_cost_size(), and postgresGetForeignRelSize().

{
    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);
    }
}

static char * deparse_type_name ( Oid  type_oid, int32  typemod  )

static

Definition at line 851 of file deparse.c.

References format_type_with_typemod(), format_type_with_typemod_qualified(), and is_builtin().

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

{
    if (is_builtin(type_oid))
        return format_type_with_typemod(type_oid, typemod);
    else
        return format_type_with_typemod_qualified(type_oid, typemod);
}

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

static

Definition at line 2746 of file deparse.c.

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

Referenced by deparseExpr().

{
    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(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, ')');
}

void deparseAnalyzeSizeSql	(	StringInfo	buf,
		Relation	rel
	)

Definition at line 1818 of file deparse.c.

References appendStringInfo(), appendStringInfoString(), StringInfoData::data, deparseRelation(), deparseStringLiteral(), and initStringInfo().

Referenced by postgresAnalyzeForeignTable().

{
    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);
}

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

Definition at line 1838 of file deparse.c.

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

Referenced by postgresAcquireSampleRowsFunc().

{
    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);
}

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

static

Definition at line 2720 of file deparse.c.

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

Referenced by deparseExpr().

{
    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));
}

static void deparseArrayRef ( ArrayRef *  node, deparse_expr_cxt *  context  )

static

Definition at line 2385 of file deparse.c.

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

Referenced by deparseExpr().

{
    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(lowlist_item);
        }
        deparseExpr(lfirst(uplist_item), context);
        appendStringInfoChar(buf, ']');
    }

    appendStringInfoChar(buf, ')');
}

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

static

Definition at line 2649 of file deparse.c.

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

Referenced by deparseExpr().

{
    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, ')');
}

static void deparseColumnRef ( StringInfo  buf, int  varno, int  varattno, PlannerInfo *  root, bool  qualify_col  )

static

Definition at line 1899 of file deparse.c.

References ADD_REL_QUALIFIER, appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), Assert, bms_add_member(), bms_free(), defGetString(), DefElem::defname, deparseTargetList(), FirstLowInvalidHeapAttributeNumber, get_relid_attribute_name(), GetForeignColumnOptions(), heap_close, heap_open(), IS_SPECIAL_VARNO, lfirst, NoLock, ObjectIdAttributeNumber, options, planner_rt_fetch, quote_identifier(), RangeTblEntry::relid, SelfItemPointerAttributeNumber, and TableOidAttributeNumber.

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

{
    RangeTblEntry *rte;

    /* 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 == ObjectIdAttributeNumber)
    {
        if (qualify_col)
            ADD_REL_QUALIFIER(buf, varno);
        appendStringInfoString(buf, "oid");
    }
    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)
        {
            rte = planner_rt_fetch(varno, root);
            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;

        /* Get RangeTblEntry from array in PlannerInfo. */
        rte = planner_rt_fetch(varno, root);

        /*
         * The lock on the relation will be held by upper callers, so it's
         * fine to open it with no lock here.
         */
        rel = heap_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, root, varno, rel, false, attrs_used, qualify_col,
                          &retrieved_attrs);
        appendStringInfoChar(buf, ')');

        /* Complete the CASE WHEN statement started above. */
        if (qualify_col)
            appendStringInfoString(buf, " END");

        heap_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));

        /* Get RangeTblEntry from array in PlannerInfo. */
        rte = planner_rt_fetch(varno, root);

        /*
         * 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_relid_attribute_name(rte->relid, varattno);

        if (qualify_col)
            ADD_REL_QUALIFIER(buf, varno);

        appendStringInfoString(buf, quote_identifier(colname));
    }
}

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

static

Definition at line 2246 of file deparse.c.

References appendStringInfo(), appendStringInfoString(), BITOID, BOOLOID, buf, deparse_expr_cxt::buf, Const::constisnull, Const::consttype, Const::consttypmod, Const::constvalue, deparse_type_name(), deparseStringLiteral(), FLOAT4OID, FLOAT8OID, getTypeOutputInfo(), INT2OID, INT4OID, INT8OID, NUMERICOID, OIDOID, OidOutputFunctionCall(), pfree(), UNKNOWNOID, and VARBITOID.

Referenced by deparseExpr(), and deparseSortGroupClause().

{
    StringInfo  buf = context->buf;
    Oid         typoutput;
    bool        typIsVarlena;
    char       *extval;
    bool        isfloat = 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);
            break;
    }

    pfree(extval);

    if (showtype < 0)
        return;

    /*
     * 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:
            needlabel = true;
            break;
    }
    if (needlabel || showtype > 0)
        appendStringInfo(buf, "::%s",
                         deparse_type_name(node->consttype,
                                           node->consttypmod));
}

void deparseDeleteSql	(	StringInfo	buf,
		PlannerInfo *	root,
		Index	rtindex,
		Relation	rel,
		List *	returningList,
		List **	retrieved_attrs
	)

Definition at line 1721 of file deparse.c.

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

Referenced by postgresPlanForeignModify().

{
    appendStringInfoString(buf, "DELETE FROM ");
    deparseRelation(buf, rel);
    appendStringInfoString(buf, " WHERE ctid = $1");

    deparseReturningList(buf, root, rtindex, rel,
                         rel->trigdesc && rel->trigdesc->trig_delete_after_row,
                         returningList, retrieved_attrs);
}

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

Definition at line 1743 of file deparse.c.

References appendConditions(), appendStringInfoString(), buf, deparse_expr_cxt::buf, deparseRelation(), deparseReturningList(), deparse_expr_cxt::foreignrel, deparse_expr_cxt::params_list, deparse_expr_cxt::root, deparse_expr_cxt::scanrel, and PlannerInfo::simple_rel_array.

Referenced by postgresPlanDirectModify().

{
    RelOptInfo *baserel = root->simple_rel_array[rtindex];
    deparse_expr_cxt context;

    /* Set up context struct for recursion */
    context.root = root;
    context.foreignrel = baserel;
    context.scanrel = baserel;
    context.buf = buf;
    context.params_list = params_list;

    appendStringInfoString(buf, "DELETE FROM ");
    deparseRelation(buf, rel);

    if (remote_conds)
    {
        appendStringInfoString(buf, " WHERE ");
        appendConditions(remote_conds, &context);
    }

    deparseReturningList(buf, root, rtindex, rel, false,
                         returningList, retrieved_attrs);
}

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

Definition at line 1653 of file deparse.c.

References appendConditions(), appendStringInfoString(), buf, deparse_expr_cxt::buf, deparseColumnRef(), deparseExpr(), deparseRelation(), deparseReturningList(), elog, ERROR, TargetEntry::expr, deparse_expr_cxt::foreignrel, get_tle_by_resno(), lfirst_int, deparse_expr_cxt::params_list, reset_transmission_modes(), deparse_expr_cxt::root, deparse_expr_cxt::scanrel, set_transmission_modes(), and PlannerInfo::simple_rel_array.

Referenced by postgresPlanDirectModify().

{
    RelOptInfo *baserel = root->simple_rel_array[rtindex];
    deparse_expr_cxt context;
    int         nestlevel;
    bool        first;
    ListCell   *lc;

    /* Set up context struct for recursion */
    context.root = root;
    context.foreignrel = baserel;
    context.scanrel = baserel;
    context.buf = buf;
    context.params_list = params_list;

    appendStringInfoString(buf, "UPDATE ");
    deparseRelation(buf, rel);
    appendStringInfoString(buf, " SET ");

    /* Make sure any constants in the exprs are printed portably */
    nestlevel = set_transmission_modes();

    first = true;
    foreach(lc, targetAttrs)
    {
        int         attnum = lfirst_int(lc);
        TargetEntry *tle = get_tle_by_resno(targetlist, attnum);

        if (!tle)
            elog(ERROR, "attribute number %d not found in UPDATE targetlist",
                 attnum);

        if (!first)
            appendStringInfoString(buf, ", ");
        first = false;

        deparseColumnRef(buf, rtindex, attnum, root, false);
        appendStringInfoString(buf, " = ");
        deparseExpr((Expr *) tle->expr, &context);
    }

    reset_transmission_modes(nestlevel);

    if (remote_conds)
    {
        appendStringInfoString(buf, " WHERE ");
        appendConditions(remote_conds, &context);
    }

    deparseReturningList(buf, root, rtindex, rel, false,
                         returningList, retrieved_attrs);
}

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

static

Definition at line 2573 of file deparse.c.

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

Referenced by deparseExpr().

{
    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, ')');
}

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

static

Definition at line 1345 of file deparse.c.

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

Referenced by deparseSelectSql().

{
    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, ", ");
        deparseExpr((Expr *) tle->expr, context);

        *retrieved_attrs = lappend_int(*retrieved_attrs, i + 1);
        i++;
    }

    if (i == 0)
        appendStringInfoString(buf, "NULL");
}

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

static

Definition at line 2119 of file deparse.c.

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

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

{
    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_ArrayRef:
            deparseArrayRef((ArrayRef *) 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_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;
    }
}

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

static

Definition at line 1061 of file deparse.c.

References appendConditions(), appendStringInfoString(), Assert, bms_num_members(), buf, deparse_expr_cxt::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().

{
    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_num_members(scanrel->relids) > 1),
                          context->params_list);

    /* Construct WHERE clause */
    if (quals != NIL)
    {
        appendStringInfoString(buf, " WHERE ");
        appendConditions(quals, context);
    }
}

static void deparseFromExprForRel ( StringInfo  buf, PlannerInfo *  root, RelOptInfo *  joinrel, bool  use_alias, List **  params_list  )

static

Definition at line 1411 of file deparse.c.

References appendConditions(), appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), buf, deparse_expr_cxt::buf, StringInfoData::data, deparseRangeTblRef(), deparseRelation(), RelOptInfo::fdw_private, deparse_expr_cxt::foreignrel, get_jointype_name(), heap_close, heap_open(), initStringInfo(), PgFdwRelationInfo::innerrel, IS_JOIN_REL, PgFdwRelationInfo::joinclauses, PgFdwRelationInfo::jointype, PgFdwRelationInfo::make_innerrel_subquery, PgFdwRelationInfo::make_outerrel_subquery, NoLock, PgFdwRelationInfo::outerrel, deparse_expr_cxt::params_list, planner_rt_fetch, REL_ALIAS_PREFIX, RelOptInfo::relid, RangeTblEntry::relid, deparse_expr_cxt::root, and deparse_expr_cxt::scanrel.

Referenced by deparseFromExpr(), and deparseRangeTblRef().

{
    PgFdwRelationInfo *fpinfo = (PgFdwRelationInfo *) foreignrel->fdw_private;

    if (IS_JOIN_REL(foreignrel))
    {
        StringInfoData join_sql_o;
        StringInfoData join_sql_i;

        /* Deparse outer relation */
        initStringInfo(&join_sql_o);
        deparseRangeTblRef(&join_sql_o, root, fpinfo->outerrel,
                           fpinfo->make_outerrel_subquery, params_list);

        /* Deparse inner relation */
        initStringInfo(&join_sql_i);
        deparseRangeTblRef(&join_sql_i, root, fpinfo->innerrel,
                           fpinfo->make_innerrel_subquery, params_list);

        /*
         * 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 = heap_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);

        heap_close(rel, NoLock);
    }
}

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

static

Definition at line 2431 of file deparse.c.

References appendFunctionName(), appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), arg, FuncExpr::args, buf, deparse_expr_cxt::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().

{
    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(arg) == NULL)
            appendStringInfoString(buf, "VARIADIC ");
        deparseExpr((Expr *) lfirst(arg), context);
        first = false;
    }
    appendStringInfoChar(buf, ')');
}

void deparseInsertSql	(	StringInfo	buf,
		PlannerInfo *	root,
		Index	rtindex,
		Relation	rel,
		List *	targetAttrs,
		bool	doNothing,
		List *	returningList,
		List **	retrieved_attrs
	)

Definition at line 1548 of file deparse.c.

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

Referenced by postgresPlanForeignModify().

{
    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, root, false);
        }

        appendStringInfoString(buf, ") VALUES (");

        pindex = 1;
        first = true;
        foreach(lc, targetAttrs)
        {
            if (!first)
                appendStringInfoString(buf, ", ");
            first = false;

            appendStringInfo(buf, "$%d", pindex);
            pindex++;
        }

        appendStringInfoChar(buf, ')');
    }
    else
        appendStringInfoString(buf, " DEFAULT VALUES");

    if (doNothing)
        appendStringInfoString(buf, " ON CONFLICT DO NOTHING");

    deparseReturningList(buf, root, rtindex, rel,
                         rel->trigdesc && rel->trigdesc->trig_insert_after_row,
                         returningList, retrieved_attrs);
}

static void deparseLockingClause ( deparse_expr_cxt *  context )

static

Definition at line 1187 of file deparse.c.

References appendStringInfo(), appendStringInfoString(), bms_is_member(), bms_next_member(), bms_num_members(), buf, deparse_expr_cxt::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, Query::resultRelation, deparse_expr_cxt::root, PlannerInfo::rowMarks, deparse_expr_cxt::scanrel, and PlanRowMark::strength.

Referenced by deparseSelectStmtForRel().

{
    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 (relid == root->parse->resultRelation &&
            (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_num_members(rel->relids) > 1 &&
                    rc->strength != LCS_NONE)
                    appendStringInfo(buf, " OF %s%d", REL_ALIAS_PREFIX, relid);
            }
        }
    }
}

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

static

Definition at line 2687 of file deparse.c.

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

Referenced by deparseExpr().

{
    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)");
    }
}

static void deparseOperatorName ( StringInfo  buf, Form_pg_operator  opform  )

static

Definition at line 2545 of file deparse.c.

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

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

{
    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);
    }
}

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

static

Definition at line 2494 of file deparse.c.

References appendStringInfoChar(), arg, OpExpr::args, Assert, buf, deparse_expr_cxt::buf, deparseExpr(), deparseOperatorName(), elog, ERROR, GETSTRUCT, HeapTupleIsValid, lfirst, list_head(), list_length(), list_tail(), ObjectIdGetDatum, OPEROID, OpExpr::opno, ReleaseSysCache(), and SearchSysCache1.

Referenced by deparseExpr().

{
    StringInfo  buf = context->buf;
    HeapTuple   tuple;
    Form_pg_operator form;
    char        oprkind;
    ListCell   *arg;

    /* 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 == 'r' && list_length(node->args) == 1) ||
           (oprkind == 'l' && list_length(node->args) == 1) ||
           (oprkind == 'b' && list_length(node->args) == 2));

    /* Always parenthesize the expression. */
    appendStringInfoChar(buf, '(');

    /* Deparse left operand. */
    if (oprkind == 'r' || oprkind == 'b')
    {
        arg = list_head(node->args);
        deparseExpr(lfirst(arg), context);
        appendStringInfoChar(buf, ' ');
    }

    /* Deparse operator name. */
    deparseOperatorName(buf, form);

    /* Deparse right operand. */
    if (oprkind == 'l' || oprkind == 'b')
    {
        arg = list_tail(node->args);
        appendStringInfoChar(buf, ' ');
        deparseExpr(lfirst(arg), context);
    }

    appendStringInfoChar(buf, ')');

    ReleaseSysCache(tuple);
}

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

static

Definition at line 2352 of file deparse.c.

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

Referenced by deparseExpr().

{
    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);
    }
}

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

static

Definition at line 1488 of file deparse.c.

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

Referenced by deparseFromExprForRel().

{
    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;

        /* Deparse the subquery representing the relation. */
        appendStringInfoChar(buf, '(');
        deparseSelectStmtForRel(buf, root, foreignrel, NIL,
                                fpinfo->remote_conds, NIL, 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, params_list);
}

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

static

Definition at line 2636 of file deparse.c.

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().

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

static void deparseRelation ( StringInfo  buf, Relation  rel  )

static

Definition at line 2044 of file deparse.c.

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

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

{
    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));
}

static void deparseReturningList ( StringInfo  buf, PlannerInfo *  root, Index  rtindex, Relation  rel, bool  trig_after_row, List *  returningList, List **  retrieved_attrs  )

static

Definition at line 1777 of file deparse.c.

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

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

{
    Bitmapset  *attrs_used = NULL;

    if (trig_after_row)
    {
        /* whole-row reference acquires all non-system columns */
        attrs_used =
            bms_make_singleton(0 - FirstLowInvalidHeapAttributeNumber);
    }

    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, root, rtindex, rel, true, attrs_used, false,
                          retrieved_attrs);
    else
        *retrieved_attrs = NIL;
}

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

static

Definition at line 2591 of file deparse.c.

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

Referenced by deparseExpr().

{
    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);
}

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

static

Definition at line 1003 of file deparse.c.

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

Referenced by deparseSelectStmtForRel().

{
    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, 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 = heap_open(rte->relid, NoLock);

        deparseTargetList(buf, root, foreignrel->relid, rel, false,
                          fpinfo->attrs_used, false, retrieved_attrs);
        heap_close(rel, NoLock);
    }
}

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

Definition at line 925 of file deparse.c.

References appendConditions(), appendGroupByClause(), appendOrderByClause(), appendStringInfoString(), Assert, buf, deparse_expr_cxt::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().

{
    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, &context);

    /* Add any necessary FOR UPDATE/SHARE. */
    deparseLockingClause(&context);
}

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

static

Definition at line 3050 of file deparse.c.

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

Referenced by appendAggOrderBy(), and appendGroupByClause().

{
    StringInfo  buf = context->buf;
    TargetEntry *tle;
    Expr       *expr;

    tle = get_sortgroupref_tle(ref, tlist);
    expr = tle->expr;

    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;
}

void deparseStringLiteral	(	StringInfo	buf,
		const char *	val
	)

Definition at line 2084 of file deparse.c.

References appendStringInfoChar(), ESCAPE_STRING_SYNTAX, and SQL_STR_DOUBLE.

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

{
    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, '\'');
}

static void deparseSubqueryTargetList ( deparse_expr_cxt *  context )

static

Definition at line 1376 of file deparse.c.

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

Referenced by deparseSelectSql().

{
    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");
}

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

static

Definition at line 1095 of file deparse.c.

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

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

{
    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, root, qualify_col);

            *retrieved_attrs = lappend_int(*retrieved_attrs, i);
        }
    }

    /*
     * Add ctid and oid 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);
    }
    if (bms_is_member(ObjectIdAttributeNumber - 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, "oid");

        *retrieved_attrs = lappend_int(*retrieved_attrs,
                                       ObjectIdAttributeNumber);
    }

    /* Don't generate bad syntax if no undropped columns */
    if (first && !is_returning)
        appendStringInfoString(buf, "NULL");
}

void deparseUpdateSql	(	StringInfo	buf,
		PlannerInfo *	root,
		Index	rtindex,
		Relation	rel,
		List *	targetAttrs,
		List *	returningList,
		List **	retrieved_attrs
	)

Definition at line 1611 of file deparse.c.

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

Referenced by postgresPlanForeignModify().

{
    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);

        if (!first)
            appendStringInfoString(buf, ", ");
        first = false;

        deparseColumnRef(buf, rtindex, attnum, root, false);
        appendStringInfo(buf, " = $%d", pindex);
        pindex++;
    }
    appendStringInfoString(buf, " WHERE ctid = $1");

    deparseReturningList(buf, root, rtindex, rel,
                         rel->trigdesc && rel->trigdesc->trig_update_after_row,
                         returningList, retrieved_attrs);
}

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

static

Definition at line 2181 of file deparse.c.

References appendStringInfo(), bms_is_member(), bms_num_members(), deparse_expr_cxt::buf, deparseColumnRef(), equal(), is_subquery_var(), lappend(), lfirst, deparse_expr_cxt::params_list, 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().

{
    Relids      relids = context->scanrel->relids;
    int         relno;
    int         colno;

    /* Qualify columns when multiple relations are involved. */
    bool        qualify_col = (bms_num_members(relids) > 1);

    /*
     * 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,
                         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);
        }
    }
}

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

static

Definition at line 290 of file deparse.c.

References Aggref::aggcollid, Aggref::aggfilter, Aggref::aggfnoid, Aggref::aggorder, Aggref::aggsplit, AGGSPLIT_SIMPLE, RelabelType::arg, NullTest::arg, Aggref::args, FuncExpr::args, OpExpr::args, ScalarArrayOpExpr::args, BoolExpr::args, ArrayExpr::array_collid, bms_is_member(), foreign_loc_cxt::collation, Const::constcollid, DEFAULT_COLLATION_OID, ArrayExpr::elements, TargetEntry::expr, exprType(), FDW_COLLATE_NONE, FDW_COLLATE_SAFE, FDW_COLLATE_UNSAFE, RelOptInfo::fdw_private, fe(), foreign_glob_cxt::foreignrel, FuncExpr::funccollid, FuncExpr::funcid, get_sortgroupref_tle(), TypeCacheEntry::gt_opr, Aggref::inputcollid, FuncExpr::inputcollid, OpExpr::inputcollid, ScalarArrayOpExpr::inputcollid, InvalidOid, is_shippable(), IS_UPPER_REL, IsA, lfirst, lookup_type_cache(), TypeCacheEntry::lt_opr, nodeTag, ObjectIdAttributeNumber, OidIsValid, OpExpr::opcollid, OperatorRelationId, OpExpr::opno, ScalarArrayOpExpr::opno, Param::paramcollid, ProcedureRelationId, ArrayRef::refassgnexpr, ArrayRef::refcollid, ArrayRef::refexpr, ArrayRef::reflowerindexpr, ArrayRef::refupperindexpr, foreign_glob_cxt::relids, RelabelType::resultcollid, SelfItemPointerAttributeNumber, SortGroupClause::sortop, foreign_loc_cxt::state, T_Aggref, T_ArrayExpr, T_ArrayRef, T_BoolExpr, T_Const, T_DistinctExpr, T_FuncExpr, T_List, T_NullTest, T_OpExpr, T_Param, T_RelabelType, T_ScalarArrayOpExpr, T_Var, SortGroupClause::tleSortGroupRef, TYPECACHE_GT_OPR, TYPECACHE_LT_OPR, TypeRelationId, Var::varattno, Var::varcollid, Var::varlevelsup, and Var::varno.

Referenced by is_foreign_expr().

{
    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 and oid 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 &&
                        var->varattno != ObjectIdAttributeNumber)
                        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;

                /*
                 * 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_ArrayRef:
            {
                ArrayRef   *ar = (ArrayRef *) node;

                /* Assignment should not be in restrictions. */
                if (ar->refassgnexpr != NULL)
                    return false;

                /*
                 * Recurse to remaining subexpressions.  Since the array
                 * subscripts must yield (noncollatable) integers, they won't
                 * affect the inner_cxt state.
                 */
                if (!foreign_expr_walker((Node *) ar->refupperindexpr,
                                         glob_cxt, &inner_cxt))
                    return false;
                if (!foreign_expr_walker((Node *) ar->reflowerindexpr,
                                         glob_cxt, &inner_cxt))
                    return false;
                if (!foreign_expr_walker((Node *) ar->refexpr,
                                         glob_cxt, &inner_cxt))
                    return false;

                /*
                 * Array subscripting should yield same collation as input,
                 * but for safety use same logic as for function nodes.
                 */
                collation = ar->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))
                    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))
                    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))
                    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))
                    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))
                    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))
                    return false;

                /* Output is always boolean and so noncollatable. */
                collation = InvalidOid;
                state = FDW_COLLATE_NONE;
            }
            break;
        case T_ArrayExpr:
            {
                ArrayExpr  *a = (ArrayExpr *) node;

                /*
                 * Recurse to input subexpressions.
                 */
                if (!foreign_expr_walker((Node *) a->elements,
                                         glob_cxt, &inner_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))
                        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))
                        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))
                    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;
}

const char* get_jointype_name

(

JoinType

jointype

)

Definition at line 1311 of file deparse.c.

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

Referenced by deparseFromExprForRel(), and foreign_join_ok().

{
    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;
}

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

static

Definition at line 3150 of file deparse.c.

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

Referenced by is_subquery_var().

{
    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");
}

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

Definition at line 226 of file deparse.c.

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

Referenced by classifyConditions(), foreign_grouping_ok(), foreign_join_ok(), get_useful_pathkeys_for_relation(), postgresGetForeignPaths(), postgresGetForeignPlan(), and postgresPlanDirectModify().

{
    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))
        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;
}

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

static

Definition at line 3088 of file deparse.c.

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().

{
    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);
    }
}

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

static

Definition at line 2897 of file deparse.c.

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

Referenced by deparseParam(), and deparseVar().

{
    StringInfo  buf = context->buf;
    char       *ptypename = deparse_type_name(paramtype, paramtypmod);

    appendStringInfo(buf, "$%d::%s", paramindex, ptypename);
}

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

static

Definition at line 2923 of file deparse.c.

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

Referenced by deparseParam(), and deparseVar().

{
    StringInfo  buf = context->buf;
    char       *ptypename = deparse_type_name(paramtype, paramtypmod);

    appendStringInfo(buf, "((SELECT null::%s)::%s)", ptypename, ptypename);
}