plancat.c File Reference

#include "postgres.h"
#include <math.h>
#include "access/genam.h"
#include "access/htup_details.h"
#include "access/nbtree.h"
#include "access/sysattr.h"
#include "access/table.h"
#include "access/tableam.h"
#include "access/transam.h"
#include "access/xlog.h"
#include "catalog/catalog.h"
#include "catalog/heap.h"
#include "catalog/pg_am.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_statistic_ext.h"
#include "catalog/pg_statistic_ext_data.h"
#include "foreign/fdwapi.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "nodes/supportnodes.h"
#include "optimizer/clauses.h"
#include "optimizer/cost.h"
#include "optimizer/optimizer.h"
#include "optimizer/plancat.h"
#include "optimizer/prep.h"
#include "parser/parse_relation.h"
#include "parser/parsetree.h"
#include "partitioning/partdesc.h"
#include "rewrite/rewriteManip.h"
#include "statistics/statistics.h"
#include "storage/bufmgr.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/partcache.h"
#include "utils/rel.h"
#include "utils/snapmgr.h"
#include "utils/syscache.h"

Include dependency graph for plancat.c:

Go to the source code of this file.

Functions
static void	get_relation_foreign_keys (PlannerInfo *root, RelOptInfo *rel, Relation relation, bool inhparent)
static bool	infer_collation_opclass_match (InferenceElem *elem, Relation idxRel, List *idxExprs)
static List *	get_relation_constraints (PlannerInfo *root, Oid relationObjectId, RelOptInfo *rel, bool include_noinherit, bool include_notnull, bool include_partition)
static List *	build_index_tlist (PlannerInfo *root, IndexOptInfo *index, Relation heapRelation)
static List *	get_relation_statistics (RelOptInfo *rel, Relation relation)
static void	set_relation_partition_info (PlannerInfo *root, RelOptInfo *rel, Relation relation)
static PartitionScheme	find_partition_scheme (PlannerInfo *root, Relation relation)
static void	set_baserel_partition_key_exprs (Relation relation, RelOptInfo *rel)
static void	set_baserel_partition_constraint (Relation relation, RelOptInfo *rel)
void	get_relation_info (PlannerInfo *root, Oid relationObjectId, bool inhparent, RelOptInfo *rel)
List *	infer_arbiter_indexes (PlannerInfo *root)
void	estimate_rel_size (Relation rel, int32 *attr_widths, BlockNumber *pages, double *tuples, double *allvisfrac)
int32	get_rel_data_width (Relation rel, int32 *attr_widths)
int32	get_relation_data_width (Oid relid, int32 *attr_widths)
static void	get_relation_statistics_worker (List **stainfos, RelOptInfo *rel, Oid statOid, bool inh, Bitmapset *keys, List *exprs)
bool	relation_excluded_by_constraints (PlannerInfo *root, RelOptInfo *rel, RangeTblEntry *rte)
List *	build_physical_tlist (PlannerInfo *root, RelOptInfo *rel)
Selectivity	restriction_selectivity (PlannerInfo *root, Oid operatorid, List *args, Oid inputcollid, int varRelid)
Selectivity	join_selectivity (PlannerInfo *root, Oid operatorid, List *args, Oid inputcollid, JoinType jointype, SpecialJoinInfo *sjinfo)
Selectivity	function_selectivity (PlannerInfo *root, Oid funcid, List *args, Oid inputcollid, bool is_join, int varRelid, JoinType jointype, SpecialJoinInfo *sjinfo)
void	add_function_cost (PlannerInfo *root, Oid funcid, Node *node, QualCost *cost)
double	get_function_rows (PlannerInfo *root, Oid funcid, Node *node)
bool	has_unique_index (RelOptInfo *rel, AttrNumber attno)
bool	has_row_triggers (PlannerInfo *root, Index rti, CmdType event)
bool	has_stored_generated_columns (PlannerInfo *root, Index rti)
Bitmapset *	get_dependent_generated_columns (PlannerInfo *root, Index rti, Bitmapset *target_cols)

Variables
int	constraint_exclusion = CONSTRAINT_EXCLUSION_PARTITION
get_relation_info_hook_type	get_relation_info_hook = NULL

Function Documentation

add_function_cost()

void add_function_cost	(	PlannerInfo *	root,
		Oid	funcid,
		Node *	node,
		QualCost *	cost
	)

Definition at line 2043 of file plancat.c.

{
    HeapTuple   proctup;
    Form_pg_proc procform;
 
    proctup = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcid));
    if (!HeapTupleIsValid(proctup))
        elog(ERROR, "cache lookup failed for function %u", funcid);
    procform = (Form_pg_proc) GETSTRUCT(proctup);
 
    if (OidIsValid(procform->prosupport))
    {
        SupportRequestCost req;
        SupportRequestCost *sresult;
 
        req.type = T_SupportRequestCost;
        req.root = root;
        req.funcid = funcid;
        req.node = node;
 
        /* Initialize cost fields so that support function doesn't have to */
        req.startup = 0;
        req.per_tuple = 0;
 
        sresult = (SupportRequestCost *)
            DatumGetPointer(OidFunctionCall1(procform->prosupport,
                                             PointerGetDatum(&req)));
 
        if (sresult == &req)
        {
            /* Success, so accumulate support function's estimate into *cost */
            cost->startup += req.startup;
            cost->per_tuple += req.per_tuple;
            ReleaseSysCache(proctup);
            return;
        }
    }
 
    /* No support function, or it failed, so rely on procost */
    cost->per_tuple += procform->procost * cpu_operator_cost;
 
    ReleaseSysCache(proctup);
}

References cpu_operator_cost, DatumGetPointer(), elog(), ERROR, SupportRequestCost::funcid, GETSTRUCT, HeapTupleIsValid, SupportRequestCost::node, ObjectIdGetDatum(), OidFunctionCall1, OidIsValid, QualCost::per_tuple, SupportRequestCost::per_tuple, PointerGetDatum(), PROCOID, ReleaseSysCache(), SupportRequestCost::root, SearchSysCache1(), QualCost::startup, SupportRequestCost::startup, and SupportRequestCost::type.

Referenced by cost_qual_eval_walker(), cost_windowagg(), and get_agg_clause_costs().

build_index_tlist()

static List * build_index_tlist ( PlannerInfo *  root, IndexOptInfo *  index, Relation  heapRelation  )

static

Definition at line 1839 of file plancat.c.

{
    List       *tlist = NIL;
    Index       varno = index->rel->relid;
    ListCell   *indexpr_item;
    int         i;
 
    indexpr_item = list_head(index->indexprs);
    for (i = 0; i < index->ncolumns; i++)
    {
        int         indexkey = index->indexkeys[i];
        Expr       *indexvar;
 
        if (indexkey != 0)
        {
            /* simple column */
            const FormData_pg_attribute *att_tup;
 
            if (indexkey < 0)
                att_tup = SystemAttributeDefinition(indexkey);
            else
                att_tup = TupleDescAttr(heapRelation->rd_att, indexkey - 1);
 
            indexvar = (Expr *) makeVar(varno,
                                        indexkey,
                                        att_tup->atttypid,
                                        att_tup->atttypmod,
                                        att_tup->attcollation,
                                        0);
        }
        else
        {
            /* expression column */
            if (indexpr_item == NULL)
                elog(ERROR, "wrong number of index expressions");
            indexvar = (Expr *) lfirst(indexpr_item);
            indexpr_item = lnext(index->indexprs, indexpr_item);
        }
 
        tlist = lappend(tlist,
                        makeTargetEntry(indexvar,
                                        i + 1,
                                        NULL,
                                        false));
    }
    if (indexpr_item != NULL)
        elog(ERROR, "wrong number of index expressions");
 
    return tlist;
}

References elog(), ERROR, FormData_pg_attribute, i, lappend(), lfirst, list_head(), lnext(), makeTargetEntry(), makeVar(), NIL, RelationData::rd_att, SystemAttributeDefinition(), and TupleDescAttr.

Referenced by get_relation_info().

build_physical_tlist()

List* build_physical_tlist	(	PlannerInfo *	root,
		RelOptInfo *	rel
	)

Definition at line 1718 of file plancat.c.

{
    List       *tlist = NIL;
    Index       varno = rel->relid;
    RangeTblEntry *rte = planner_rt_fetch(varno, root);
    Relation    relation;
    Query      *subquery;
    Var        *var;
    ListCell   *l;
    int         attrno,
                numattrs;
    List       *colvars;
 
    switch (rte->rtekind)
    {
        case RTE_RELATION:
            /* Assume we already have adequate lock */
            relation = table_open(rte->relid, NoLock);
 
            numattrs = RelationGetNumberOfAttributes(relation);
            for (attrno = 1; attrno <= numattrs; attrno++)
            {
                Form_pg_attribute att_tup = TupleDescAttr(relation->rd_att,
                                                          attrno - 1);
 
                if (att_tup->attisdropped || att_tup->atthasmissing)
                {
                    /* found a dropped or missing col, so punt */
                    tlist = NIL;
                    break;
                }
 
                var = makeVar(varno,
                              attrno,
                              att_tup->atttypid,
                              att_tup->atttypmod,
                              att_tup->attcollation,
                              0);
 
                tlist = lappend(tlist,
                                makeTargetEntry((Expr *) var,
                                                attrno,
                                                NULL,
                                                false));
            }
 
            table_close(relation, NoLock);
            break;
 
        case RTE_SUBQUERY:
            subquery = rte->subquery;
            foreach(l, subquery->targetList)
            {
                TargetEntry *tle = (TargetEntry *) lfirst(l);
 
                /*
                 * A resjunk column of the subquery can be reflected as
                 * resjunk in the physical tlist; we need not punt.
                 */
                var = makeVarFromTargetEntry(varno, tle);
 
                tlist = lappend(tlist,
                                makeTargetEntry((Expr *) var,
                                                tle->resno,
                                                NULL,
                                                tle->resjunk));
            }
            break;
 
        case RTE_FUNCTION:
        case RTE_TABLEFUNC:
        case RTE_VALUES:
        case RTE_CTE:
        case RTE_NAMEDTUPLESTORE:
        case RTE_RESULT:
            /* Not all of these can have dropped cols, but share code anyway */
            expandRTE(rte, varno, 0, -1, true /* include dropped */ ,
                      NULL, &colvars);
            foreach(l, colvars)
            {
                var = (Var *) lfirst(l);
 
                /*
                 * A non-Var in expandRTE's output means a dropped column;
                 * must punt.
                 */
                if (!IsA(var, Var))
                {
                    tlist = NIL;
                    break;
                }
 
                tlist = lappend(tlist,
                                makeTargetEntry((Expr *) var,
                                                var->varattno,
                                                NULL,
                                                false));
            }
            break;
 
        default:
            /* caller error */
            elog(ERROR, "unsupported RTE kind %d in build_physical_tlist",
                 (int) rte->rtekind);
            break;
    }
 
    return tlist;
}

References elog(), ERROR, expandRTE(), IsA, lappend(), lfirst, makeTargetEntry(), makeVar(), makeVarFromTargetEntry(), NIL, NoLock, planner_rt_fetch, RelationData::rd_att, RelationGetNumberOfAttributes, RangeTblEntry::relid, RelOptInfo::relid, TargetEntry::resno, RTE_CTE, RTE_FUNCTION, RTE_NAMEDTUPLESTORE, RTE_RELATION, RTE_RESULT, RTE_SUBQUERY, RTE_TABLEFUNC, RTE_VALUES, RangeTblEntry::rtekind, RangeTblEntry::subquery, table_close(), table_open(), Query::targetList, and TupleDescAttr.

Referenced by create_scan_plan().

estimate_rel_size()

void estimate_rel_size	(	Relation	rel,
		int32 *	attr_widths,
		BlockNumber *	pages,
		double *	tuples,
		double *	allvisfrac
	)

Definition at line 1013 of file plancat.c.

{
    BlockNumber curpages;
    BlockNumber relpages;
    double      reltuples;
    BlockNumber relallvisible;
    double      density;
 
    if (RELKIND_HAS_TABLE_AM(rel->rd_rel->relkind))
    {
        table_relation_estimate_size(rel, attr_widths, pages, tuples,
                                     allvisfrac);
    }
    else if (rel->rd_rel->relkind == RELKIND_INDEX)
    {
        /*
         * XXX: It'd probably be good to move this into a callback, individual
         * index types e.g. know if they have a metapage.
         */
 
        /* it has storage, ok to call the smgr */
        curpages = RelationGetNumberOfBlocks(rel);
 
        /* report estimated # pages */
        *pages = curpages;
        /* quick exit if rel is clearly empty */
        if (curpages == 0)
        {
            *tuples = 0;
            *allvisfrac = 0;
            return;
        }
 
        /* coerce values in pg_class to more desirable types */
        relpages = (BlockNumber) rel->rd_rel->relpages;
        reltuples = (double) rel->rd_rel->reltuples;
        relallvisible = (BlockNumber) rel->rd_rel->relallvisible;
 
        /*
         * Discount the metapage while estimating the number of tuples. This
         * is a kluge because it assumes more than it ought to about index
         * structure.  Currently it's OK for btree, hash, and GIN indexes but
         * suspect for GiST indexes.
         */
        if (relpages > 0)
        {
            curpages--;
            relpages--;
        }
 
        /* estimate number of tuples from previous tuple density */
        if (reltuples >= 0 && relpages > 0)
            density = reltuples / (double) relpages;
        else
        {
            /*
             * If we have no data because the relation was never vacuumed,
             * estimate tuple width from attribute datatypes.  We assume here
             * that the pages are completely full, which is OK for tables
             * (since they've presumably not been VACUUMed yet) but is
             * probably an overestimate for indexes.  Fortunately
             * get_relation_info() can clamp the overestimate to the parent
             * table's size.
             *
             * Note: this code intentionally disregards alignment
             * considerations, because (a) that would be gilding the lily
             * considering how crude the estimate is, and (b) it creates
             * platform dependencies in the default plans which are kind of a
             * headache for regression testing.
             *
             * XXX: Should this logic be more index specific?
             */
            int32       tuple_width;
 
            tuple_width = get_rel_data_width(rel, attr_widths);
            tuple_width += MAXALIGN(SizeofHeapTupleHeader);
            tuple_width += sizeof(ItemIdData);
            /* note: integer division is intentional here */
            density = (BLCKSZ - SizeOfPageHeaderData) / tuple_width;
        }
        *tuples = rint(density * (double) curpages);
 
        /*
         * We use relallvisible as-is, rather than scaling it up like we do
         * for the pages and tuples counts, on the theory that any pages added
         * since the last VACUUM are most likely not marked all-visible.  But
         * costsize.c wants it converted to a fraction.
         */
        if (relallvisible == 0 || curpages <= 0)
            *allvisfrac = 0;
        else if ((double) relallvisible >= curpages)
            *allvisfrac = 1;
        else
            *allvisfrac = (double) relallvisible / curpages;
    }
    else
    {
        /*
         * Just use whatever's in pg_class.  This covers foreign tables,
         * sequences, and also relkinds without storage (shouldn't get here?);
         * see initializations in AddNewRelationTuple().  Note that FDW must
         * cope if reltuples is -1!
         */
        *pages = rel->rd_rel->relpages;
        *tuples = rel->rd_rel->reltuples;
        *allvisfrac = 0;
    }
}

References get_rel_data_width(), if(), MAXALIGN, RelationData::rd_rel, RelationGetNumberOfBlocks, SizeofHeapTupleHeader, SizeOfPageHeaderData, and table_relation_estimate_size().

Referenced by get_relation_info(), hashbuild(), and plan_create_index_workers().

find_partition_scheme()

static PartitionScheme find_partition_scheme ( PlannerInfo *  root, Relation  relation  )

static

Definition at line 2349 of file plancat.c.

{
    PartitionKey partkey = RelationGetPartitionKey(relation);
    ListCell   *lc;
    int         partnatts,
                i;
    PartitionScheme part_scheme;
 
    /* A partitioned table should have a partition key. */
    Assert(partkey != NULL);
 
    partnatts = partkey->partnatts;
 
    /* Search for a matching partition scheme and return if found one. */
    foreach(lc, root->part_schemes)
    {
        part_scheme = lfirst(lc);
 
        /* Match partitioning strategy and number of keys. */
        if (partkey->strategy != part_scheme->strategy ||
            partnatts != part_scheme->partnatts)
            continue;
 
        /* Match partition key type properties. */
        if (memcmp(partkey->partopfamily, part_scheme->partopfamily,
                   sizeof(Oid) * partnatts) != 0 ||
            memcmp(partkey->partopcintype, part_scheme->partopcintype,
                   sizeof(Oid) * partnatts) != 0 ||
            memcmp(partkey->partcollation, part_scheme->partcollation,
                   sizeof(Oid) * partnatts) != 0)
            continue;
 
        /*
         * Length and byval information should match when partopcintype
         * matches.
         */
        Assert(memcmp(partkey->parttyplen, part_scheme->parttyplen,
                      sizeof(int16) * partnatts) == 0);
        Assert(memcmp(partkey->parttypbyval, part_scheme->parttypbyval,
                      sizeof(bool) * partnatts) == 0);
 
        /*
         * If partopfamily and partopcintype matched, must have the same
         * partition comparison functions.  Note that we cannot reliably
         * Assert the equality of function structs themselves for they might
         * be different across PartitionKey's, so just Assert for the function
         * OIDs.
         */
#ifdef USE_ASSERT_CHECKING
        for (i = 0; i < partkey->partnatts; i++)
            Assert(partkey->partsupfunc[i].fn_oid ==
                   part_scheme->partsupfunc[i].fn_oid);
#endif
 
        /* Found matching partition scheme. */
        return part_scheme;
    }
 
    /*
     * Did not find matching partition scheme. Create one copying relevant
     * information from the relcache. We need to copy the contents of the
     * array since the relcache entry may not survive after we have closed the
     * relation.
     */
    part_scheme = (PartitionScheme) palloc0(sizeof(PartitionSchemeData));
    part_scheme->strategy = partkey->strategy;
    part_scheme->partnatts = partkey->partnatts;
 
    part_scheme->partopfamily = (Oid *) palloc(sizeof(Oid) * partnatts);
    memcpy(part_scheme->partopfamily, partkey->partopfamily,
           sizeof(Oid) * partnatts);
 
    part_scheme->partopcintype = (Oid *) palloc(sizeof(Oid) * partnatts);
    memcpy(part_scheme->partopcintype, partkey->partopcintype,
           sizeof(Oid) * partnatts);
 
    part_scheme->partcollation = (Oid *) palloc(sizeof(Oid) * partnatts);
    memcpy(part_scheme->partcollation, partkey->partcollation,
           sizeof(Oid) * partnatts);
 
    part_scheme->parttyplen = (int16 *) palloc(sizeof(int16) * partnatts);
    memcpy(part_scheme->parttyplen, partkey->parttyplen,
           sizeof(int16) * partnatts);
 
    part_scheme->parttypbyval = (bool *) palloc(sizeof(bool) * partnatts);
    memcpy(part_scheme->parttypbyval, partkey->parttypbyval,
           sizeof(bool) * partnatts);
 
    part_scheme->partsupfunc = (FmgrInfo *)
        palloc(sizeof(FmgrInfo) * partnatts);
    for (i = 0; i < partnatts; i++)
        fmgr_info_copy(&part_scheme->partsupfunc[i], &partkey->partsupfunc[i],
                       CurrentMemoryContext);
 
    /* Add the partitioning scheme to PlannerInfo. */
    root->part_schemes = lappend(root->part_schemes, part_scheme);
 
    return part_scheme;
}

References Assert(), CurrentMemoryContext, fmgr_info_copy(), FmgrInfo::fn_oid, i, lappend(), lfirst, palloc(), palloc0(), PartitionSchemeData::partcollation, PartitionKeyData::partcollation, PartitionSchemeData::partnatts, PartitionKeyData::partnatts, PartitionSchemeData::partopcintype, PartitionKeyData::partopcintype, PartitionSchemeData::partopfamily, PartitionKeyData::partopfamily, PartitionSchemeData::partsupfunc, PartitionKeyData::partsupfunc, PartitionSchemeData::parttypbyval, PartitionKeyData::parttypbyval, PartitionSchemeData::parttyplen, PartitionKeyData::parttyplen, RelationGetPartitionKey(), PartitionSchemeData::strategy, and PartitionKeyData::strategy.

Referenced by set_relation_partition_info().

function_selectivity()

Selectivity function_selectivity	(	PlannerInfo *	root,
		Oid	funcid,
		List *	args,
		Oid	inputcollid,
		bool	is_join,
		int	varRelid,
		JoinType	jointype,
		SpecialJoinInfo *	sjinfo
	)

Definition at line 1981 of file plancat.c.

{
    RegProcedure prosupport = get_func_support(funcid);
    SupportRequestSelectivity req;
    SupportRequestSelectivity *sresult;
 
    /*
     * If no support function is provided, use our historical default
     * estimate, 0.3333333.  This seems a pretty unprincipled choice, but
     * Postgres has been using that estimate for function calls since 1992.
     * The hoariness of this behavior suggests that we should not be in too
     * much hurry to use another value.
     */
    if (!prosupport)
        return (Selectivity) 0.3333333;
 
    req.type = T_SupportRequestSelectivity;
    req.root = root;
    req.funcid = funcid;
    req.args = args;
    req.inputcollid = inputcollid;
    req.is_join = is_join;
    req.varRelid = varRelid;
    req.jointype = jointype;
    req.sjinfo = sjinfo;
    req.selectivity = -1;       /* to catch failure to set the value */
 
    sresult = (SupportRequestSelectivity *)
        DatumGetPointer(OidFunctionCall1(prosupport,
                                         PointerGetDatum(&req)));
 
    /* If support function fails, use default */
    if (sresult != &req)
        return (Selectivity) 0.3333333;
 
    if (req.selectivity < 0.0 || req.selectivity > 1.0)
        elog(ERROR, "invalid function selectivity: %f", req.selectivity);
 
    return (Selectivity) req.selectivity;
}

References generate_unaccent_rules::args, SupportRequestSelectivity::args, DatumGetPointer(), elog(), ERROR, SupportRequestSelectivity::funcid, get_func_support(), SupportRequestSelectivity::inputcollid, SupportRequestSelectivity::is_join, SupportRequestSelectivity::jointype, OidFunctionCall1, PointerGetDatum(), SupportRequestSelectivity::root, SupportRequestSelectivity::selectivity, SupportRequestSelectivity::sjinfo, SupportRequestSelectivity::type, and SupportRequestSelectivity::varRelid.

Referenced by clause_selectivity_ext().

get_dependent_generated_columns()

Bitmapset* get_dependent_generated_columns	(	PlannerInfo *	root,
		Index	rti,
		Bitmapset *	target_cols
	)

Definition at line 2271 of file plancat.c.

{
    Bitmapset  *dependentCols = NULL;
    RangeTblEntry *rte = planner_rt_fetch(rti, root);
    Relation    relation;
    TupleDesc   tupdesc;
    TupleConstr *constr;
 
    /* Assume we already have adequate lock */
    relation = table_open(rte->relid, NoLock);
 
    tupdesc = RelationGetDescr(relation);
    constr = tupdesc->constr;
 
    if (constr && constr->has_generated_stored)
    {
        for (int i = 0; i < constr->num_defval; i++)
        {
            AttrDefault *defval = &constr->defval[i];
            Node       *expr;
            Bitmapset  *attrs_used = NULL;
 
            /* skip if not generated column */
            if (!TupleDescAttr(tupdesc, defval->adnum - 1)->attgenerated)
                continue;
 
            /* identify columns this generated column depends on */
            expr = stringToNode(defval->adbin);
            pull_varattnos(expr, 1, &attrs_used);
 
            if (bms_overlap(target_cols, attrs_used))
                dependentCols = bms_add_member(dependentCols,
                                               defval->adnum - FirstLowInvalidHeapAttributeNumber);
        }
    }
 
    table_close(relation, NoLock);
 
    return dependentCols;
}

References AttrDefault::adbin, AttrDefault::adnum, bms_add_member(), bms_overlap(), TupleDescData::constr, TupleConstr::defval, FirstLowInvalidHeapAttributeNumber, TupleConstr::has_generated_stored, i, NoLock, TupleConstr::num_defval, planner_rt_fetch, pull_varattnos(), RelationGetDescr, RangeTblEntry::relid, stringToNode(), table_close(), table_open(), and TupleDescAttr.

Referenced by get_rel_all_updated_cols().

get_function_rows()

double get_function_rows	(	PlannerInfo *	root,
		Oid	funcid,
		Node *	node
	)

Definition at line 2104 of file plancat.c.

{
    HeapTuple   proctup;
    Form_pg_proc procform;
    double      result;
 
    proctup = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcid));
    if (!HeapTupleIsValid(proctup))
        elog(ERROR, "cache lookup failed for function %u", funcid);
    procform = (Form_pg_proc) GETSTRUCT(proctup);
 
    Assert(procform->proretset);    /* else caller error */
 
    if (OidIsValid(procform->prosupport))
    {
        SupportRequestRows req;
        SupportRequestRows *sresult;
 
        req.type = T_SupportRequestRows;
        req.root = root;
        req.funcid = funcid;
        req.node = node;
 
        req.rows = 0;           /* just for sanity */
 
        sresult = (SupportRequestRows *)
            DatumGetPointer(OidFunctionCall1(procform->prosupport,
                                             PointerGetDatum(&req)));
 
        if (sresult == &req)
        {
            /* Success */
            ReleaseSysCache(proctup);
            return req.rows;
        }
    }
 
    /* No support function, or it failed, so rely on prorows */
    result = procform->prorows;
 
    ReleaseSysCache(proctup);
 
    return result;
}

References Assert(), DatumGetPointer(), elog(), ERROR, SupportRequestRows::funcid, GETSTRUCT, HeapTupleIsValid, SupportRequestRows::node, ObjectIdGetDatum(), OidFunctionCall1, OidIsValid, PointerGetDatum(), PROCOID, ReleaseSysCache(), SupportRequestRows::root, SupportRequestRows::rows, SearchSysCache1(), and SupportRequestRows::type.

Referenced by expression_returns_set_rows().

get_rel_data_width()

int32 get_rel_data_width	(	Relation	rel,
		int32 *	attr_widths
	)

Definition at line 1138 of file plancat.c.

{
    int32       tuple_width = 0;
    int         i;
 
    for (i = 1; i <= RelationGetNumberOfAttributes(rel); i++)
    {
        Form_pg_attribute att = TupleDescAttr(rel->rd_att, i - 1);
        int32       item_width;
 
        if (att->attisdropped)
            continue;
 
        /* use previously cached data, if any */
        if (attr_widths != NULL && attr_widths[i] > 0)
        {
            tuple_width += attr_widths[i];
            continue;
        }
 
        /* This should match set_rel_width() in costsize.c */
        item_width = get_attavgwidth(RelationGetRelid(rel), i);
        if (item_width <= 0)
        {
            item_width = get_typavgwidth(att->atttypid, att->atttypmod);
            Assert(item_width > 0);
        }
        if (attr_widths != NULL)
            attr_widths[i] = item_width;
        tuple_width += item_width;
    }
 
    return tuple_width;
}

References Assert(), get_attavgwidth(), get_typavgwidth(), i, RelationData::rd_att, RelationGetNumberOfAttributes, RelationGetRelid, and TupleDescAttr.

Referenced by estimate_rel_size(), get_relation_data_width(), and table_block_relation_estimate_size().

get_relation_constraints()

static List * get_relation_constraints ( PlannerInfo *  root, Oid  relationObjectId, RelOptInfo *  rel, bool  include_noinherit, bool  include_notnull, bool  include_partition  )

static

Definition at line 1220 of file plancat.c.

{
    List       *result = NIL;
    Index       varno = rel->relid;
    Relation    relation;
    TupleConstr *constr;
 
    /*
     * We assume the relation has already been safely locked.
     */
    relation = table_open(relationObjectId, NoLock);
 
    constr = relation->rd_att->constr;
    if (constr != NULL)
    {
        int         num_check = constr->num_check;
        int         i;
 
        for (i = 0; i < num_check; i++)
        {
            Node       *cexpr;
 
            /*
             * If this constraint hasn't been fully validated yet, we must
             * ignore it here.  Also ignore if NO INHERIT and we weren't told
             * that that's safe.
             */
            if (!constr->check[i].ccvalid)
                continue;
            if (constr->check[i].ccnoinherit && !include_noinherit)
                continue;
 
            cexpr = stringToNode(constr->check[i].ccbin);
 
            /*
             * Run each expression through const-simplification and
             * canonicalization.  This is not just an optimization, but is
             * necessary, because we will be comparing it to
             * similarly-processed qual clauses, and may fail to detect valid
             * matches without this.  This must match the processing done to
             * qual clauses in preprocess_expression()!  (We can skip the
             * stuff involving subqueries, however, since we don't allow any
             * in check constraints.)
             */
            cexpr = eval_const_expressions(root, cexpr);
 
            cexpr = (Node *) canonicalize_qual((Expr *) cexpr, true);
 
            /* Fix Vars to have the desired varno */
            if (varno != 1)
                ChangeVarNodes(cexpr, 1, varno, 0);
 
            /*
             * Finally, convert to implicit-AND format (that is, a List) and
             * append the resulting item(s) to our output list.
             */
            result = list_concat(result,
                                 make_ands_implicit((Expr *) cexpr));
        }
 
        /* Add NOT NULL constraints in expression form, if requested */
        if (include_notnull && constr->has_not_null)
        {
            int         natts = relation->rd_att->natts;
 
            for (i = 1; i <= natts; i++)
            {
                Form_pg_attribute att = TupleDescAttr(relation->rd_att, i - 1);
 
                if (att->attnotnull && !att->attisdropped)
                {
                    NullTest   *ntest = makeNode(NullTest);
 
                    ntest->arg = (Expr *) makeVar(varno,
                                                  i,
                                                  att->atttypid,
                                                  att->atttypmod,
                                                  att->attcollation,
                                                  0);
                    ntest->nulltesttype = IS_NOT_NULL;
 
                    /*
                     * argisrow=false is correct even for a composite column,
                     * because attnotnull does not represent a SQL-spec IS NOT
                     * NULL test in such a case, just IS DISTINCT FROM NULL.
                     */
                    ntest->argisrow = false;
                    ntest->location = -1;
                    result = lappend(result, ntest);
                }
            }
        }
    }
 
    /*
     * Add partitioning constraints, if requested.
     */
    if (include_partition && relation->rd_rel->relispartition)
    {
        /* make sure rel->partition_qual is set */
        set_baserel_partition_constraint(relation, rel);
        result = list_concat(result, rel->partition_qual);
    }
 
    table_close(relation, NoLock);
 
    return result;
}

References NullTest::arg, canonicalize_qual(), ConstrCheck::ccbin, ConstrCheck::ccnoinherit, ConstrCheck::ccvalid, ChangeVarNodes(), TupleConstr::check, TupleDescData::constr, eval_const_expressions(), TupleConstr::has_not_null, i, IS_NOT_NULL, lappend(), list_concat(), NullTest::location, make_ands_implicit(), makeNode, makeVar(), TupleDescData::natts, NIL, NoLock, NullTest::nulltesttype, TupleConstr::num_check, RelOptInfo::partition_qual, RelationData::rd_att, RelationData::rd_rel, RelOptInfo::relid, set_baserel_partition_constraint(), stringToNode(), table_close(), table_open(), and TupleDescAttr.

Referenced by relation_excluded_by_constraints().

get_relation_data_width()

int32 get_relation_data_width	(	Oid	relid,
		int32 *	attr_widths
	)

Definition at line 1180 of file plancat.c.

{
    int32       result;
    Relation    relation;
 
    /* As above, assume relation is already locked */
    relation = table_open(relid, NoLock);
 
    result = get_rel_data_width(relation, attr_widths);
 
    table_close(relation, NoLock);
 
    return result;
}

References get_rel_data_width(), NoLock, table_close(), and table_open().

Referenced by plan_cluster_use_sort(), and set_rel_width().

get_relation_foreign_keys()

static void get_relation_foreign_keys ( PlannerInfo *  root, RelOptInfo *  rel, Relation  relation, bool  inhparent  )

static

Definition at line 550 of file plancat.c.

{
    List       *rtable = root->parse->rtable;
    List       *cachedfkeys;
    ListCell   *lc;
 
    /*
     * If it's not a baserel, we don't care about its FKs.  Also, if the query
     * references only a single relation, we can skip the lookup since no FKs
     * could satisfy the requirements below.
     */
    if (rel->reloptkind != RELOPT_BASEREL ||
        list_length(rtable) < 2)
        return;
 
    /*
     * If it's the parent of an inheritance tree, ignore its FKs.  We could
     * make useful FK-based deductions if we found that all members of the
     * inheritance tree have equivalent FK constraints, but detecting that
     * would require code that hasn't been written.
     */
    if (inhparent)
        return;
 
    /*
     * Extract data about relation's FKs from the relcache.  Note that this
     * list belongs to the relcache and might disappear in a cache flush, so
     * we must not do any further catalog access within this function.
     */
    cachedfkeys = RelationGetFKeyList(relation);
 
    /*
     * Figure out which FKs are of interest for this query, and create
     * ForeignKeyOptInfos for them.  We want only FKs that reference some
     * other RTE of the current query.  In queries containing self-joins,
     * there might be more than one other RTE for a referenced table, and we
     * should make a ForeignKeyOptInfo for each occurrence.
     *
     * Ideally, we would ignore RTEs that correspond to non-baserels, but it's
     * too hard to identify those here, so we might end up making some useless
     * ForeignKeyOptInfos.  If so, match_foreign_keys_to_quals() will remove
     * them again.
     */
    foreach(lc, cachedfkeys)
    {
        ForeignKeyCacheInfo *cachedfk = (ForeignKeyCacheInfo *) lfirst(lc);
        Index       rti;
        ListCell   *lc2;
 
        /* conrelid should always be that of the table we're considering */
        Assert(cachedfk->conrelid == RelationGetRelid(relation));
 
        /* Scan to find other RTEs matching confrelid */
        rti = 0;
        foreach(lc2, rtable)
        {
            RangeTblEntry *rte = (RangeTblEntry *) lfirst(lc2);
            ForeignKeyOptInfo *info;
 
            rti++;
            /* Ignore if not the correct table */
            if (rte->rtekind != RTE_RELATION ||
                rte->relid != cachedfk->confrelid)
                continue;
            /* Ignore if it's an inheritance parent; doesn't really match */
            if (rte->inh)
                continue;
            /* Ignore self-referential FKs; we only care about joins */
            if (rti == rel->relid)
                continue;
 
            /* OK, let's make an entry */
            info = makeNode(ForeignKeyOptInfo);
            info->con_relid = rel->relid;
            info->ref_relid = rti;
            info->nkeys = cachedfk->nkeys;
            memcpy(info->conkey, cachedfk->conkey, sizeof(info->conkey));
            memcpy(info->confkey, cachedfk->confkey, sizeof(info->confkey));
            memcpy(info->conpfeqop, cachedfk->conpfeqop, sizeof(info->conpfeqop));
            /* zero out fields to be filled by match_foreign_keys_to_quals */
            info->nmatched_ec = 0;
            info->nconst_ec = 0;
            info->nmatched_rcols = 0;
            info->nmatched_ri = 0;
            memset(info->eclass, 0, sizeof(info->eclass));
            memset(info->fk_eclass_member, 0, sizeof(info->fk_eclass_member));
            memset(info->rinfos, 0, sizeof(info->rinfos));
 
            root->fkey_list = lappend(root->fkey_list, info);
        }
    }
}

References Assert(), ForeignKeyOptInfo::con_relid, ForeignKeyCacheInfo::confrelid, ForeignKeyCacheInfo::conrelid, ForeignKeyOptInfo::eclass, ForeignKeyOptInfo::fk_eclass_member, PlannerInfo::fkey_list, RangeTblEntry::inh, lappend(), lfirst, list_length(), makeNode, ForeignKeyOptInfo::nconst_ec, ForeignKeyOptInfo::nkeys, ForeignKeyCacheInfo::nkeys, ForeignKeyOptInfo::nmatched_ec, ForeignKeyOptInfo::nmatched_rcols, ForeignKeyOptInfo::nmatched_ri, PlannerInfo::parse, ForeignKeyOptInfo::ref_relid, RelationGetFKeyList(), RelationGetRelid, RangeTblEntry::relid, RelOptInfo::relid, RELOPT_BASEREL, RelOptInfo::reloptkind, ForeignKeyOptInfo::rinfos, Query::rtable, RTE_RELATION, and RangeTblEntry::rtekind.

Referenced by get_relation_info().

get_relation_info()

void get_relation_info	(	PlannerInfo *	root,
		Oid	relationObjectId,
		bool	inhparent,
		RelOptInfo *	rel
	)

Definition at line 117 of file plancat.c.

{
    Index       varno = rel->relid;
    Relation    relation;
    bool        hasindex;
    List       *indexinfos = NIL;
 
    /*
     * We need not lock the relation since it was already locked, either by
     * the rewriter or when expand_inherited_rtentry() added it to the query's
     * rangetable.
     */
    relation = table_open(relationObjectId, NoLock);
 
    /*
     * Relations without a table AM can be used in a query only if they are of
     * special-cased relkinds.  This check prevents us from crashing later if,
     * for example, a view's ON SELECT rule has gone missing.  Note that
     * table_open() already rejected indexes and composite types; spell the
     * error the same way it does.
     */
    if (!relation->rd_tableam)
    {
        if (!(relation->rd_rel->relkind == RELKIND_FOREIGN_TABLE ||
              relation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE))
            ereport(ERROR,
                    (errcode(ERRCODE_WRONG_OBJECT_TYPE),
                     errmsg("cannot open relation \"%s\"",
                            RelationGetRelationName(relation)),
                     errdetail_relkind_not_supported(relation->rd_rel->relkind)));
    }
 
    /* Temporary and unlogged relations are inaccessible during recovery. */
    if (!RelationIsPermanent(relation) && RecoveryInProgress())
        ereport(ERROR,
                (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                 errmsg("cannot access temporary or unlogged relations during recovery")));
 
    rel->min_attr = FirstLowInvalidHeapAttributeNumber + 1;
    rel->max_attr = RelationGetNumberOfAttributes(relation);
    rel->reltablespace = RelationGetForm(relation)->reltablespace;
 
    Assert(rel->max_attr >= rel->min_attr);
    rel->attr_needed = (Relids *)
        palloc0((rel->max_attr - rel->min_attr + 1) * sizeof(Relids));
    rel->attr_widths = (int32 *)
        palloc0((rel->max_attr - rel->min_attr + 1) * sizeof(int32));
 
    /*
     * Estimate relation size --- unless it's an inheritance parent, in which
     * case the size we want is not the rel's own size but the size of its
     * inheritance tree.  That will be computed in set_append_rel_size().
     */
    if (!inhparent)
        estimate_rel_size(relation, rel->attr_widths - rel->min_attr,
                          &rel->pages, &rel->tuples, &rel->allvisfrac);
 
    /* Retrieve the parallel_workers reloption, or -1 if not set. */
    rel->rel_parallel_workers = RelationGetParallelWorkers(relation, -1);
 
    /*
     * Make list of indexes.  Ignore indexes on system catalogs if told to.
     * Don't bother with indexes from traditional inheritance parents.  For
     * partitioned tables, we need a list of at least unique indexes as these
     * serve as unique proofs for certain planner optimizations.  However,
     * let's not discriminate here and just record all partitioned indexes
     * whether they're unique indexes or not.
     */
    if ((inhparent && relation->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
        || (IgnoreSystemIndexes && IsSystemRelation(relation)))
        hasindex = false;
    else
        hasindex = relation->rd_rel->relhasindex;
 
    if (hasindex)
    {
        List       *indexoidlist;
        LOCKMODE    lmode;
        ListCell   *l;
 
        indexoidlist = RelationGetIndexList(relation);
 
        /*
         * For each index, we get the same type of lock that the executor will
         * need, and do not release it.  This saves a couple of trips to the
         * shared lock manager while not creating any real loss of
         * concurrency, because no schema changes could be happening on the
         * index while we hold lock on the parent rel, and no lock type used
         * for queries blocks any other kind of index operation.
         */
        lmode = root->simple_rte_array[varno]->rellockmode;
 
        foreach(l, indexoidlist)
        {
            Oid         indexoid = lfirst_oid(l);
            Relation    indexRelation;
            Form_pg_index index;
            IndexAmRoutine *amroutine;
            IndexOptInfo *info;
            int         ncolumns,
                        nkeycolumns;
            int         i;
 
            /*
             * Extract info from the relation descriptor for the index.
             */
            indexRelation = index_open(indexoid, lmode);
            index = indexRelation->rd_index;
 
            /*
             * Ignore invalid indexes, since they can't safely be used for
             * queries.  Note that this is OK because the data structure we
             * are constructing is only used by the planner --- the executor
             * still needs to insert into "invalid" indexes, if they're marked
             * indisready.
             */
            if (!index->indisvalid)
            {
                index_close(indexRelation, NoLock);
                continue;
            }
 
            /*
             * If the index is valid, but cannot yet be used, ignore it; but
             * mark the plan we are generating as transient. See
             * src/backend/access/heap/README.HOT for discussion.
             */
            if (index->indcheckxmin &&
                !TransactionIdPrecedes(HeapTupleHeaderGetXmin(indexRelation->rd_indextuple->t_data),
                                       TransactionXmin))
            {
                root->glob->transientPlan = true;
                index_close(indexRelation, NoLock);
                continue;
            }
 
            info = makeNode(IndexOptInfo);
 
            info->indexoid = index->indexrelid;
            info->reltablespace =
                RelationGetForm(indexRelation)->reltablespace;
            info->rel = rel;
            info->ncolumns = ncolumns = index->indnatts;
            info->nkeycolumns = nkeycolumns = index->indnkeyatts;
 
            info->indexkeys = (int *) palloc(sizeof(int) * ncolumns);
            info->indexcollations = (Oid *) palloc(sizeof(Oid) * nkeycolumns);
            info->opfamily = (Oid *) palloc(sizeof(Oid) * nkeycolumns);
            info->opcintype = (Oid *) palloc(sizeof(Oid) * nkeycolumns);
            info->canreturn = (bool *) palloc(sizeof(bool) * ncolumns);
 
            for (i = 0; i < ncolumns; i++)
            {
                info->indexkeys[i] = index->indkey.values[i];
                info->canreturn[i] = index_can_return(indexRelation, i + 1);
            }
 
            for (i = 0; i < nkeycolumns; i++)
            {
                info->opfamily[i] = indexRelation->rd_opfamily[i];
                info->opcintype[i] = indexRelation->rd_opcintype[i];
                info->indexcollations[i] = indexRelation->rd_indcollation[i];
            }
 
            info->relam = indexRelation->rd_rel->relam;
 
            /*
             * We don't have an AM for partitioned indexes, so we'll just
             * NULLify the AM related fields for those.
             */
            if (indexRelation->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
            {
                /* We copy just the fields we need, not all of rd_indam */
                amroutine = indexRelation->rd_indam;
                info->amcanorderbyop = amroutine->amcanorderbyop;
                info->amoptionalkey = amroutine->amoptionalkey;
                info->amsearcharray = amroutine->amsearcharray;
                info->amsearchnulls = amroutine->amsearchnulls;
                info->amcanparallel = amroutine->amcanparallel;
                info->amhasgettuple = (amroutine->amgettuple != NULL);
                info->amhasgetbitmap = amroutine->amgetbitmap != NULL &&
                    relation->rd_tableam->scan_bitmap_next_block != NULL;
                info->amcanmarkpos = (amroutine->ammarkpos != NULL &&
                                      amroutine->amrestrpos != NULL);
                info->amcostestimate = amroutine->amcostestimate;
                Assert(info->amcostestimate != NULL);
 
                /* Fetch index opclass options */
                info->opclassoptions = RelationGetIndexAttOptions(indexRelation, true);
 
                /*
                 * Fetch the ordering information for the index, if any.
                 */
                if (info->relam == BTREE_AM_OID)
                {
                    /*
                     * If it's a btree index, we can use its opfamily OIDs
                     * directly as the sort ordering opfamily OIDs.
                     */
                    Assert(amroutine->amcanorder);
 
                    info->sortopfamily = info->opfamily;
                    info->reverse_sort = (bool *) palloc(sizeof(bool) * nkeycolumns);
                    info->nulls_first = (bool *) palloc(sizeof(bool) * nkeycolumns);
 
                    for (i = 0; i < nkeycolumns; i++)
                    {
                        int16       opt = indexRelation->rd_indoption[i];
 
                        info->reverse_sort[i] = (opt & INDOPTION_DESC) != 0;
                        info->nulls_first[i] = (opt & INDOPTION_NULLS_FIRST) != 0;
                    }
                }
                else if (amroutine->amcanorder)
                {
                    /*
                     * Otherwise, identify the corresponding btree opfamilies
                     * by trying to map this index's "<" operators into btree.
                     * Since "<" uniquely defines the behavior of a sort
                     * order, this is a sufficient test.
                     *
                     * XXX This method is rather slow and also requires the
                     * undesirable assumption that the other index AM numbers
                     * its strategies the same as btree.  It'd be better to
                     * have a way to explicitly declare the corresponding
                     * btree opfamily for each opfamily of the other index
                     * type.  But given the lack of current or foreseeable
                     * amcanorder index types, it's not worth expending more
                     * effort on now.
                     */
                    info->sortopfamily = (Oid *) palloc(sizeof(Oid) * nkeycolumns);
                    info->reverse_sort = (bool *) palloc(sizeof(bool) * nkeycolumns);
                    info->nulls_first = (bool *) palloc(sizeof(bool) * nkeycolumns);
 
                    for (i = 0; i < nkeycolumns; i++)
                    {
                        int16       opt = indexRelation->rd_indoption[i];
                        Oid         ltopr;
                        Oid         btopfamily;
                        Oid         btopcintype;
                        int16       btstrategy;
 
                        info->reverse_sort[i] = (opt & INDOPTION_DESC) != 0;
                        info->nulls_first[i] = (opt & INDOPTION_NULLS_FIRST) != 0;
 
                        ltopr = get_opfamily_member(info->opfamily[i],
                                                    info->opcintype[i],
                                                    info->opcintype[i],
                                                    BTLessStrategyNumber);
                        if (OidIsValid(ltopr) &&
                            get_ordering_op_properties(ltopr,
                                                       &btopfamily,
                                                       &btopcintype,
                                                       &btstrategy) &&
                            btopcintype == info->opcintype[i] &&
                            btstrategy == BTLessStrategyNumber)
                        {
                            /* Successful mapping */
                            info->sortopfamily[i] = btopfamily;
                        }
                        else
                        {
                            /* Fail ... quietly treat index as unordered */
                            info->sortopfamily = NULL;
                            info->reverse_sort = NULL;
                            info->nulls_first = NULL;
                            break;
                        }
                    }
                }
                else
                {
                    info->sortopfamily = NULL;
                    info->reverse_sort = NULL;
                    info->nulls_first = NULL;
                }
            }
            else
            {
                info->amcanorderbyop = false;
                info->amoptionalkey = false;
                info->amsearcharray = false;
                info->amsearchnulls = false;
                info->amcanparallel = false;
                info->amhasgettuple = false;
                info->amhasgetbitmap = false;
                info->amcanmarkpos = false;
                info->amcostestimate = NULL;
 
                info->sortopfamily = NULL;
                info->reverse_sort = NULL;
                info->nulls_first = NULL;
            }
 
            /*
             * Fetch the index expressions and predicate, if any.  We must
             * modify the copies we obtain from the relcache to have the
             * correct varno for the parent relation, so that they match up
             * correctly against qual clauses.
             */
            info->indexprs = RelationGetIndexExpressions(indexRelation);
            info->indpred = RelationGetIndexPredicate(indexRelation);
            if (info->indexprs && varno != 1)
                ChangeVarNodes((Node *) info->indexprs, 1, varno, 0);
            if (info->indpred && varno != 1)
                ChangeVarNodes((Node *) info->indpred, 1, varno, 0);
 
            /* Build targetlist using the completed indexprs data */
            info->indextlist = build_index_tlist(root, info, relation);
 
            info->indrestrictinfo = NIL;    /* set later, in indxpath.c */
            info->predOK = false;   /* set later, in indxpath.c */
            info->unique = index->indisunique;
            info->immediate = index->indimmediate;
            info->hypothetical = false;
 
            /*
             * Estimate the index size.  If it's not a partial index, we lock
             * the number-of-tuples estimate to equal the parent table; if it
             * is partial then we have to use the same methods as we would for
             * a table, except we can be sure that the index is not larger
             * than the table.  We must ignore partitioned indexes here as
             * there are not physical indexes.
             */
            if (indexRelation->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
            {
                if (info->indpred == NIL)
                {
                    info->pages = RelationGetNumberOfBlocks(indexRelation);
                    info->tuples = rel->tuples;
                }
                else
                {
                    double      allvisfrac; /* dummy */
 
                    estimate_rel_size(indexRelation, NULL,
                                      &info->pages, &info->tuples, &allvisfrac);
                    if (info->tuples > rel->tuples)
                        info->tuples = rel->tuples;
                }
 
                if (info->relam == BTREE_AM_OID)
                {
                    /*
                     * For btrees, get tree height while we have the index
                     * open
                     */
                    info->tree_height = _bt_getrootheight(indexRelation);
                }
                else
                {
                    /* For other index types, just set it to "unknown" for now */
                    info->tree_height = -1;
                }
            }
            else
            {
                /* Zero these out for partitioned indexes */
                info->pages = 0;
                info->tuples = 0.0;
                info->tree_height = -1;
            }
 
            index_close(indexRelation, NoLock);
 
            /*
             * We've historically used lcons() here.  It'd make more sense to
             * use lappend(), but that causes the planner to change behavior
             * in cases where two indexes seem equally attractive.  For now,
             * stick with lcons() --- few tables should have so many indexes
             * that the O(N^2) behavior of lcons() is really a problem.
             */
            indexinfos = lcons(info, indexinfos);
        }
 
        list_free(indexoidlist);
    }
 
    rel->indexlist = indexinfos;
 
    rel->statlist = get_relation_statistics(rel, relation);
 
    /* Grab foreign-table info using the relcache, while we have it */
    if (relation->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
    {
        rel->serverid = GetForeignServerIdByRelId(RelationGetRelid(relation));
        rel->fdwroutine = GetFdwRoutineForRelation(relation, true);
    }
    else
    {
        rel->serverid = InvalidOid;
        rel->fdwroutine = NULL;
    }
 
    /* Collect info about relation's foreign keys, if relevant */
    get_relation_foreign_keys(root, rel, relation, inhparent);
 
    /* Collect info about functions implemented by the rel's table AM. */
    if (relation->rd_tableam &&
        relation->rd_tableam->scan_set_tidrange != NULL &&
        relation->rd_tableam->scan_getnextslot_tidrange != NULL)
        rel->amflags |= AMFLAG_HAS_TID_RANGE;
 
    /*
     * Collect info about relation's partitioning scheme, if any. Only
     * inheritance parents may be partitioned.
     */
    if (inhparent && relation->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
        set_relation_partition_info(root, rel, relation);
 
    table_close(relation, NoLock);
 
    /*
     * Allow a plugin to editorialize on the info we obtained from the
     * catalogs.  Actions might include altering the assumed relation size,
     * removing an index, or adding a hypothetical index to the indexlist.
     */
    if (get_relation_info_hook)
        (*get_relation_info_hook) (root, relationObjectId, inhparent, rel);
}

References _bt_getrootheight(), RelOptInfo::allvisfrac, IndexOptInfo::amcanmarkpos, IndexAmRoutine::amcanorder, IndexAmRoutine::amcanorderbyop, IndexOptInfo::amcanorderbyop, IndexAmRoutine::amcanparallel, IndexOptInfo::amcanparallel, IndexAmRoutine::amcostestimate, IndexOptInfo::amcostestimate, AMFLAG_HAS_TID_RANGE, RelOptInfo::amflags, IndexAmRoutine::amgetbitmap, IndexAmRoutine::amgettuple, IndexOptInfo::amhasgetbitmap, IndexOptInfo::amhasgettuple, IndexAmRoutine::ammarkpos, IndexAmRoutine::amoptionalkey, IndexOptInfo::amoptionalkey, IndexAmRoutine::amrestrpos, IndexAmRoutine::amsearcharray, IndexOptInfo::amsearcharray, IndexAmRoutine::amsearchnulls, IndexOptInfo::amsearchnulls, Assert(), BTLessStrategyNumber, build_index_tlist(), ChangeVarNodes(), ereport, errcode(), errdetail_relkind_not_supported(), errmsg(), ERROR, estimate_rel_size(), FirstLowInvalidHeapAttributeNumber, get_opfamily_member(), get_ordering_op_properties(), get_relation_foreign_keys(), get_relation_info_hook, get_relation_statistics(), GetFdwRoutineForRelation(), GetForeignServerIdByRelId(), PlannerInfo::glob, HeapTupleHeaderGetXmin, IndexOptInfo::hypothetical, i, IgnoreSystemIndexes, IndexOptInfo::immediate, index_can_return(), index_close(), index_open(), RelOptInfo::indexlist, IndexOptInfo::indexoid, IndexOptInfo::indextlist, IndexOptInfo::indpred, IndexOptInfo::indrestrictinfo, InvalidOid, IsSystemRelation(), lcons(), lfirst_oid, list_free(), makeNode, RelOptInfo::max_attr, RelOptInfo::min_attr, IndexOptInfo::ncolumns, NIL, IndexOptInfo::nkeycolumns, NoLock, OidIsValid, RelOptInfo::pages, IndexOptInfo::pages, palloc(), palloc0(), IndexOptInfo::predOK, RelationData::rd_indam, RelationData::rd_indcollation, RelationData::rd_index, RelationData::rd_indextuple, RelationData::rd_indoption, RelationData::rd_opcintype, RelationData::rd_opfamily, RelationData::rd_rel, RelationData::rd_tableam, RecoveryInProgress(), RelOptInfo::rel_parallel_workers, IndexOptInfo::relam, RelationGetForm, RelationGetIndexAttOptions(), RelationGetIndexExpressions(), RelationGetIndexList(), RelationGetIndexPredicate(), RelationGetNumberOfAttributes, RelationGetNumberOfBlocks, RelationGetParallelWorkers, RelationGetRelationName, RelationGetRelid, RelationIsPermanent, RelOptInfo::relid, RelOptInfo::reltablespace, IndexOptInfo::reltablespace, TableAmRoutine::scan_bitmap_next_block, TableAmRoutine::scan_getnextslot_tidrange, TableAmRoutine::scan_set_tidrange, RelOptInfo::serverid, set_relation_partition_info(), RelOptInfo::statlist, HeapTupleData::t_data, table_close(), table_open(), TransactionIdPrecedes(), TransactionXmin, PlannerGlobal::transientPlan, IndexOptInfo::tree_height, RelOptInfo::tuples, IndexOptInfo::tuples, and IndexOptInfo::unique.

Referenced by build_simple_rel().

get_relation_statistics()

static List * get_relation_statistics ( RelOptInfo *  rel, Relation  relation  )

static

Definition at line 1423 of file plancat.c.

{
    Index       varno = rel->relid;
    List       *statoidlist;
    List       *stainfos = NIL;
    ListCell   *l;
 
    statoidlist = RelationGetStatExtList(relation);
 
    foreach(l, statoidlist)
    {
        Oid         statOid = lfirst_oid(l);
        Form_pg_statistic_ext staForm;
        HeapTuple   htup;
        Bitmapset  *keys = NULL;
        List       *exprs = NIL;
        int         i;
 
        htup = SearchSysCache1(STATEXTOID, ObjectIdGetDatum(statOid));
        if (!HeapTupleIsValid(htup))
            elog(ERROR, "cache lookup failed for statistics object %u", statOid);
        staForm = (Form_pg_statistic_ext) GETSTRUCT(htup);
 
        /*
         * First, build the array of columns covered.  This is ultimately
         * wasted if no stats within the object have actually been built, but
         * it doesn't seem worth troubling over that case.
         */
        for (i = 0; i < staForm->stxkeys.dim1; i++)
            keys = bms_add_member(keys, staForm->stxkeys.values[i]);
 
        /*
         * Preprocess expressions (if any). We read the expressions, run them
         * through eval_const_expressions, and fix the varnos.
         *
         * XXX We don't know yet if there are any data for this stats object,
         * with either stxdinherit value. But it's reasonable to assume there
         * is at least one of those, possibly both. So it's better to process
         * keys and expressions here.
         */
        {
            bool        isnull;
            Datum       datum;
 
            /* decode expression (if any) */
            datum = SysCacheGetAttr(STATEXTOID, htup,
                                    Anum_pg_statistic_ext_stxexprs, &isnull);
 
            if (!isnull)
            {
                char       *exprsString;
 
                exprsString = TextDatumGetCString(datum);
                exprs = (List *) stringToNode(exprsString);
                pfree(exprsString);
 
                /*
                 * Run the expressions through eval_const_expressions. This is
                 * not just an optimization, but is necessary, because the
                 * planner will be comparing them to similarly-processed qual
                 * clauses, and may fail to detect valid matches without this.
                 * We must not use canonicalize_qual, however, since these
                 * aren't qual expressions.
                 */
                exprs = (List *) eval_const_expressions(NULL, (Node *) exprs);
 
                /* May as well fix opfuncids too */
                fix_opfuncids((Node *) exprs);
 
                /*
                 * Modify the copies we obtain from the relcache to have the
                 * correct varno for the parent relation, so that they match
                 * up correctly against qual clauses.
                 */
                if (varno != 1)
                    ChangeVarNodes((Node *) exprs, 1, varno, 0);
            }
        }
 
        /* extract statistics for possible values of stxdinherit flag */
 
        get_relation_statistics_worker(&stainfos, rel, statOid, true, keys, exprs);
 
        get_relation_statistics_worker(&stainfos, rel, statOid, false, keys, exprs);
 
        ReleaseSysCache(htup);
        bms_free(keys);
    }
 
    list_free(statoidlist);
 
    return stainfos;
}

References bms_add_member(), bms_free(), ChangeVarNodes(), elog(), ERROR, eval_const_expressions(), fix_opfuncids(), get_relation_statistics_worker(), GETSTRUCT, HeapTupleIsValid, i, lfirst_oid, list_free(), NIL, ObjectIdGetDatum(), pfree(), RelationGetStatExtList(), ReleaseSysCache(), RelOptInfo::relid, SearchSysCache1(), STATEXTOID, stringToNode(), SysCacheGetAttr(), and TextDatumGetCString.

Referenced by get_relation_info().

get_relation_statistics_worker()

static void get_relation_statistics_worker ( List **  stainfos, RelOptInfo *  rel, Oid  statOid, bool  inh, Bitmapset *  keys, List *  exprs  )

static

Definition at line 1340 of file plancat.c.

{
    Form_pg_statistic_ext_data dataForm;
    HeapTuple   dtup;
 
    dtup = SearchSysCache2(STATEXTDATASTXOID,
                           ObjectIdGetDatum(statOid), BoolGetDatum(inh));
    if (!HeapTupleIsValid(dtup))
        return;
 
    dataForm = (Form_pg_statistic_ext_data) GETSTRUCT(dtup);
 
    /* add one StatisticExtInfo for each kind built */
    if (statext_is_kind_built(dtup, STATS_EXT_NDISTINCT))
    {
        StatisticExtInfo *info = makeNode(StatisticExtInfo);
 
        info->statOid = statOid;
        info->inherit = dataForm->stxdinherit;
        info->rel = rel;
        info->kind = STATS_EXT_NDISTINCT;
        info->keys = bms_copy(keys);
        info->exprs = exprs;
 
        *stainfos = lappend(*stainfos, info);
    }
 
    if (statext_is_kind_built(dtup, STATS_EXT_DEPENDENCIES))
    {
        StatisticExtInfo *info = makeNode(StatisticExtInfo);
 
        info->statOid = statOid;
        info->inherit = dataForm->stxdinherit;
        info->rel = rel;
        info->kind = STATS_EXT_DEPENDENCIES;
        info->keys = bms_copy(keys);
        info->exprs = exprs;
 
        *stainfos = lappend(*stainfos, info);
    }
 
    if (statext_is_kind_built(dtup, STATS_EXT_MCV))
    {
        StatisticExtInfo *info = makeNode(StatisticExtInfo);
 
        info->statOid = statOid;
        info->inherit = dataForm->stxdinherit;
        info->rel = rel;
        info->kind = STATS_EXT_MCV;
        info->keys = bms_copy(keys);
        info->exprs = exprs;
 
        *stainfos = lappend(*stainfos, info);
    }
 
    if (statext_is_kind_built(dtup, STATS_EXT_EXPRESSIONS))
    {
        StatisticExtInfo *info = makeNode(StatisticExtInfo);
 
        info->statOid = statOid;
        info->inherit = dataForm->stxdinherit;
        info->rel = rel;
        info->kind = STATS_EXT_EXPRESSIONS;
        info->keys = bms_copy(keys);
        info->exprs = exprs;
 
        *stainfos = lappend(*stainfos, info);
    }
 
    ReleaseSysCache(dtup);
}

References bms_copy(), BoolGetDatum(), StatisticExtInfo::exprs, GETSTRUCT, HeapTupleIsValid, StatisticExtInfo::inherit, StatisticExtInfo::keys, StatisticExtInfo::kind, lappend(), makeNode, ObjectIdGetDatum(), ReleaseSysCache(), SearchSysCache2(), statext_is_kind_built(), STATEXTDATASTXOID, and StatisticExtInfo::statOid.

Referenced by get_relation_statistics().

has_row_triggers()

bool has_row_triggers	(	PlannerInfo *	root,
		Index	rti,
		CmdType	event
	)

Definition at line 2194 of file plancat.c.

{
    RangeTblEntry *rte = planner_rt_fetch(rti, root);
    Relation    relation;
    TriggerDesc *trigDesc;
    bool        result = false;
 
    /* Assume we already have adequate lock */
    relation = table_open(rte->relid, NoLock);
 
    trigDesc = relation->trigdesc;
    switch (event)
    {
        case CMD_INSERT:
            if (trigDesc &&
                (trigDesc->trig_insert_after_row ||
                 trigDesc->trig_insert_before_row))
                result = true;
            break;
        case CMD_UPDATE:
            if (trigDesc &&
                (trigDesc->trig_update_after_row ||
                 trigDesc->trig_update_before_row))
                result = true;
            break;
        case CMD_DELETE:
            if (trigDesc &&
                (trigDesc->trig_delete_after_row ||
                 trigDesc->trig_delete_before_row))
                result = true;
            break;
            /* There is no separate event for MERGE, only INSERT/UPDATE/DELETE */
        case CMD_MERGE:
            result = false;
            break;
        default:
            elog(ERROR, "unrecognized CmdType: %d", (int) event);
            break;
    }
 
    table_close(relation, NoLock);
    return result;
}

References CMD_DELETE, CMD_INSERT, CMD_MERGE, CMD_UPDATE, elog(), ERROR, NoLock, planner_rt_fetch, RangeTblEntry::relid, table_close(), table_open(), TriggerDesc::trig_delete_after_row, TriggerDesc::trig_delete_before_row, TriggerDesc::trig_insert_after_row, TriggerDesc::trig_insert_before_row, TriggerDesc::trig_update_after_row, TriggerDesc::trig_update_before_row, and RelationData::trigdesc.

Referenced by make_modifytable().

has_stored_generated_columns()

bool has_stored_generated_columns	(	PlannerInfo *	root,
		Index	rti
	)

Definition at line 2244 of file plancat.c.

{
    RangeTblEntry *rte = planner_rt_fetch(rti, root);
    Relation    relation;
    TupleDesc   tupdesc;
    bool        result = false;
 
    /* Assume we already have adequate lock */
    relation = table_open(rte->relid, NoLock);
 
    tupdesc = RelationGetDescr(relation);
    result = tupdesc->constr && tupdesc->constr->has_generated_stored;
 
    table_close(relation, NoLock);
 
    return result;
}

References TupleDescData::constr, TupleConstr::has_generated_stored, NoLock, planner_rt_fetch, RelationGetDescr, RangeTblEntry::relid, table_close(), and table_open().

Referenced by make_modifytable().

has_unique_index()

bool has_unique_index	(	RelOptInfo *	rel,
		AttrNumber	attno
	)

Definition at line 2162 of file plancat.c.

{
    ListCell   *ilist;
 
    foreach(ilist, rel->indexlist)
    {
        IndexOptInfo *index = (IndexOptInfo *) lfirst(ilist);
 
        /*
         * Note: ignore partial indexes, since they don't allow us to conclude
         * that all attr values are distinct, *unless* they are marked predOK
         * which means we know the index's predicate is satisfied by the
         * query. We don't take any interest in expressional indexes either.
         * Also, a multicolumn unique index doesn't allow us to conclude that
         * just the specified attr is unique.
         */
        if (index->unique &&
            index->nkeycolumns == 1 &&
            index->indexkeys[0] == attno &&
            (index->indpred == NIL || index->predOK))
            return true;
    }
    return false;
}

References RelOptInfo::indexlist, lfirst, and NIL.

Referenced by examine_variable().

infer_arbiter_indexes()

List* infer_arbiter_indexes

(

PlannerInfo *

root

)

Definition at line 665 of file plancat.c.

{
    OnConflictExpr *onconflict = root->parse->onConflict;
 
    /* Iteration state */
    RangeTblEntry *rte;
    Relation    relation;
    Oid         indexOidFromConstraint = InvalidOid;
    List       *indexList;
    ListCell   *l;
 
    /* Normalized inference attributes and inference expressions: */
    Bitmapset  *inferAttrs = NULL;
    List       *inferElems = NIL;
 
    /* Results */
    List       *results = NIL;
 
    /*
     * Quickly return NIL for ON CONFLICT DO NOTHING without an inference
     * specification or named constraint.  ON CONFLICT DO UPDATE statements
     * must always provide one or the other (but parser ought to have caught
     * that already).
     */
    if (onconflict->arbiterElems == NIL &&
        onconflict->constraint == InvalidOid)
        return NIL;
 
    /*
     * We need not lock the relation since it was already locked, either by
     * the rewriter or when expand_inherited_rtentry() added it to the query's
     * rangetable.
     */
    rte = rt_fetch(root->parse->resultRelation, root->parse->rtable);
 
    relation = table_open(rte->relid, NoLock);
 
    /*
     * Build normalized/BMS representation of plain indexed attributes, as
     * well as a separate list of expression items.  This simplifies matching
     * the cataloged definition of indexes.
     */
    foreach(l, onconflict->arbiterElems)
    {
        InferenceElem *elem = (InferenceElem *) lfirst(l);
        Var        *var;
        int         attno;
 
        if (!IsA(elem->expr, Var))
        {
            /* If not a plain Var, just shove it in inferElems for now */
            inferElems = lappend(inferElems, elem->expr);
            continue;
        }
 
        var = (Var *) elem->expr;
        attno = var->varattno;
 
        if (attno == 0)
            ereport(ERROR,
                    (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                     errmsg("whole row unique index inference specifications are not supported")));
 
        inferAttrs = bms_add_member(inferAttrs,
                                    attno - FirstLowInvalidHeapAttributeNumber);
    }
 
    /*
     * Lookup named constraint's index.  This is not immediately returned
     * because some additional sanity checks are required.
     */
    if (onconflict->constraint != InvalidOid)
    {
        indexOidFromConstraint = get_constraint_index(onconflict->constraint);
 
        if (indexOidFromConstraint == InvalidOid)
            ereport(ERROR,
                    (errcode(ERRCODE_WRONG_OBJECT_TYPE),
                     errmsg("constraint in ON CONFLICT clause has no associated index")));
    }
 
    /*
     * Using that representation, iterate through the list of indexes on the
     * target relation to try and find a match
     */
    indexList = RelationGetIndexList(relation);
 
    foreach(l, indexList)
    {
        Oid         indexoid = lfirst_oid(l);
        Relation    idxRel;
        Form_pg_index idxForm;
        Bitmapset  *indexedAttrs;
        List       *idxExprs;
        List       *predExprs;
        AttrNumber  natt;
        ListCell   *el;
 
        /*
         * Extract info from the relation descriptor for the index.  Obtain
         * the same lock type that the executor will ultimately use.
         *
         * Let executor complain about !indimmediate case directly, because
         * enforcement needs to occur there anyway when an inference clause is
         * omitted.
         */
        idxRel = index_open(indexoid, rte->rellockmode);
        idxForm = idxRel->rd_index;
 
        if (!idxForm->indisvalid)
            goto next;
 
        /*
         * Note that we do not perform a check against indcheckxmin (like e.g.
         * get_relation_info()) here to eliminate candidates, because
         * uniqueness checking only cares about the most recently committed
         * tuple versions.
         */
 
        /*
         * Look for match on "ON constraint_name" variant, which may not be
         * unique constraint.  This can only be a constraint name.
         */
        if (indexOidFromConstraint == idxForm->indexrelid)
        {
            if (!idxForm->indisunique && onconflict->action == ONCONFLICT_UPDATE)
                ereport(ERROR,
                        (errcode(ERRCODE_WRONG_OBJECT_TYPE),
                         errmsg("ON CONFLICT DO UPDATE not supported with exclusion constraints")));
 
            results = lappend_oid(results, idxForm->indexrelid);
            list_free(indexList);
            index_close(idxRel, NoLock);
            table_close(relation, NoLock);
            return results;
        }
        else if (indexOidFromConstraint != InvalidOid)
        {
            /* No point in further work for index in named constraint case */
            goto next;
        }
 
        /*
         * Only considering conventional inference at this point (not named
         * constraints), so index under consideration can be immediately
         * skipped if it's not unique
         */
        if (!idxForm->indisunique)
            goto next;
 
        /* Build BMS representation of plain (non expression) index attrs */
        indexedAttrs = NULL;
        for (natt = 0; natt < idxForm->indnkeyatts; natt++)
        {
            int         attno = idxRel->rd_index->indkey.values[natt];
 
            if (attno != 0)
                indexedAttrs = bms_add_member(indexedAttrs,
                                              attno - FirstLowInvalidHeapAttributeNumber);
        }
 
        /* Non-expression attributes (if any) must match */
        if (!bms_equal(indexedAttrs, inferAttrs))
            goto next;
 
        /* Expression attributes (if any) must match */
        idxExprs = RelationGetIndexExpressions(idxRel);
        foreach(el, onconflict->arbiterElems)
        {
            InferenceElem *elem = (InferenceElem *) lfirst(el);
 
            /*
             * Ensure that collation/opclass aspects of inference expression
             * element match.  Even though this loop is primarily concerned
             * with matching expressions, it is a convenient point to check
             * this for both expressions and ordinary (non-expression)
             * attributes appearing as inference elements.
             */
            if (!infer_collation_opclass_match(elem, idxRel, idxExprs))
                goto next;
 
            /*
             * Plain Vars don't factor into count of expression elements, and
             * the question of whether or not they satisfy the index
             * definition has already been considered (they must).
             */
            if (IsA(elem->expr, Var))
                continue;
 
            /*
             * Might as well avoid redundant check in the rare cases where
             * infer_collation_opclass_match() is required to do real work.
             * Otherwise, check that element expression appears in cataloged
             * index definition.
             */
            if (elem->infercollid != InvalidOid ||
                elem->inferopclass != InvalidOid ||
                list_member(idxExprs, elem->expr))
                continue;
 
            goto next;
        }
 
        /*
         * Now that all inference elements were matched, ensure that the
         * expression elements from inference clause are not missing any
         * cataloged expressions.  This does the right thing when unique
         * indexes redundantly repeat the same attribute, or if attributes
         * redundantly appear multiple times within an inference clause.
         */
        if (list_difference(idxExprs, inferElems) != NIL)
            goto next;
 
        /*
         * If it's a partial index, its predicate must be implied by the ON
         * CONFLICT's WHERE clause.
         */
        predExprs = RelationGetIndexPredicate(idxRel);
 
        if (!predicate_implied_by(predExprs, (List *) onconflict->arbiterWhere, false))
            goto next;
 
        results = lappend_oid(results, idxForm->indexrelid);
next:
        index_close(idxRel, NoLock);
    }
 
    list_free(indexList);
    table_close(relation, NoLock);
 
    if (results == NIL)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
                 errmsg("there is no unique or exclusion constraint matching the ON CONFLICT specification")));
 
    return results;
}

References OnConflictExpr::action, OnConflictExpr::arbiterElems, OnConflictExpr::arbiterWhere, bms_add_member(), bms_equal(), OnConflictExpr::constraint, ereport, errcode(), errmsg(), ERROR, InferenceElem::expr, FirstLowInvalidHeapAttributeNumber, get_constraint_index(), if(), index_close(), index_open(), infer_collation_opclass_match(), InferenceElem::infercollid, InferenceElem::inferopclass, InvalidOid, IsA, lappend(), lappend_oid(), lfirst, lfirst_oid, list_difference(), list_free(), list_member(), next, NIL, NoLock, Query::onConflict, ONCONFLICT_UPDATE, PlannerInfo::parse, predicate_implied_by(), RelationData::rd_index, RelationGetIndexExpressions(), RelationGetIndexList(), RelationGetIndexPredicate(), RangeTblEntry::relid, RangeTblEntry::rellockmode, rt_fetch, Query::rtable, table_close(), table_open(), and Var::varattno.

Referenced by make_modifytable().

infer_collation_opclass_match()

static bool infer_collation_opclass_match ( InferenceElem *  elem, Relation  idxRel, List *  idxExprs  )

static

Definition at line 931 of file plancat.c.

{
    AttrNumber  natt;
    Oid         inferopfamily = InvalidOid; /* OID of opclass opfamily */
    Oid         inferopcinputtype = InvalidOid; /* OID of opclass input type */
    int         nplain = 0;     /* # plain attrs observed */
 
    /*
     * If inference specification element lacks collation/opclass, then no
     * need to check for exact match.
     */
    if (elem->infercollid == InvalidOid && elem->inferopclass == InvalidOid)
        return true;
 
    /*
     * Lookup opfamily and input type, for matching indexes
     */
    if (elem->inferopclass)
    {
        inferopfamily = get_opclass_family(elem->inferopclass);
        inferopcinputtype = get_opclass_input_type(elem->inferopclass);
    }
 
    for (natt = 1; natt <= idxRel->rd_att->natts; natt++)
    {
        Oid         opfamily = idxRel->rd_opfamily[natt - 1];
        Oid         opcinputtype = idxRel->rd_opcintype[natt - 1];
        Oid         collation = idxRel->rd_indcollation[natt - 1];
        int         attno = idxRel->rd_index->indkey.values[natt - 1];
 
        if (attno != 0)
            nplain++;
 
        if (elem->inferopclass != InvalidOid &&
            (inferopfamily != opfamily || inferopcinputtype != opcinputtype))
        {
            /* Attribute needed to match opclass, but didn't */
            continue;
        }
 
        if (elem->infercollid != InvalidOid &&
            elem->infercollid != collation)
        {
            /* Attribute needed to match collation, but didn't */
            continue;
        }
 
        /* If one matching index att found, good enough -- return true */
        if (IsA(elem->expr, Var))
        {
            if (((Var *) elem->expr)->varattno == attno)
                return true;
        }
        else if (attno == 0)
        {
            Node       *nattExpr = list_nth(idxExprs, (natt - 1) - nplain);
 
            /*
             * Note that unlike routines like match_index_to_operand() we
             * don't need to care about RelabelType.  Neither the index
             * definition nor the inference clause should contain them.
             */
            if (equal(elem->expr, nattExpr))
                return true;
        }
    }
 
    return false;
}

References equal(), InferenceElem::expr, get_opclass_family(), get_opclass_input_type(), InferenceElem::infercollid, InferenceElem::inferopclass, InvalidOid, IsA, list_nth(), TupleDescData::natts, RelationData::rd_att, RelationData::rd_indcollation, RelationData::rd_index, RelationData::rd_opcintype, and RelationData::rd_opfamily.

Referenced by infer_arbiter_indexes().

join_selectivity()

Selectivity join_selectivity	(	PlannerInfo *	root,
		Oid	operatorid,
		List *	args,
		Oid	inputcollid,
		JoinType	jointype,
		SpecialJoinInfo *	sjinfo
	)

Definition at line 1940 of file plancat.c.

{
    RegProcedure oprjoin = get_oprjoin(operatorid);
    float8      result;
 
    /*
     * if the oprjoin procedure is missing for whatever reason, use a
     * selectivity of 0.5
     */
    if (!oprjoin)
        return (Selectivity) 0.5;
 
    result = DatumGetFloat8(OidFunctionCall5Coll(oprjoin,
                                                 inputcollid,
                                                 PointerGetDatum(root),
                                                 ObjectIdGetDatum(operatorid),
                                                 PointerGetDatum(args),
                                                 Int16GetDatum(jointype),
                                                 PointerGetDatum(sjinfo)));
 
    if (result < 0.0 || result > 1.0)
        elog(ERROR, "invalid join selectivity: %f", result);
 
    return (Selectivity) result;
}

References generate_unaccent_rules::args, DatumGetFloat8(), elog(), ERROR, get_oprjoin(), Int16GetDatum(), ObjectIdGetDatum(), OidFunctionCall5Coll(), and PointerGetDatum().

Referenced by clause_selectivity_ext(), rowcomparesel(), and test_support_func().

relation_excluded_by_constraints()

bool relation_excluded_by_constraints	(	PlannerInfo *	root,
		RelOptInfo *	rel,
		RangeTblEntry *	rte
	)

Definition at line 1529 of file plancat.c.

{
    bool        include_noinherit;
    bool        include_notnull;
    bool        include_partition = false;
    List       *safe_restrictions;
    List       *constraint_pred;
    List       *safe_constraints;
    ListCell   *lc;
 
    /* As of now, constraint exclusion works only with simple relations. */
    Assert(IS_SIMPLE_REL(rel));
 
    /*
     * If there are no base restriction clauses, we have no hope of proving
     * anything below, so fall out quickly.
     */
    if (rel->baserestrictinfo == NIL)
        return false;
 
    /*
     * Regardless of the setting of constraint_exclusion, detect
     * constant-FALSE-or-NULL restriction clauses.  Because const-folding will
     * reduce "anything AND FALSE" to just "FALSE", any such case should
     * result in exactly one baserestrictinfo entry.  This doesn't fire very
     * often, but it seems cheap enough to be worth doing anyway.  (Without
     * this, we'd miss some optimizations that 9.5 and earlier found via much
     * more roundabout methods.)
     */
    if (list_length(rel->baserestrictinfo) == 1)
    {
        RestrictInfo *rinfo = (RestrictInfo *) linitial(rel->baserestrictinfo);
        Expr       *clause = rinfo->clause;
 
        if (clause && IsA(clause, Const) &&
            (((Const *) clause)->constisnull ||
             !DatumGetBool(((Const *) clause)->constvalue)))
            return true;
    }
 
    /*
     * Skip further tests, depending on constraint_exclusion.
     */
    switch (constraint_exclusion)
    {
        case CONSTRAINT_EXCLUSION_OFF:
            /* In 'off' mode, never make any further tests */
            return false;
 
        case CONSTRAINT_EXCLUSION_PARTITION:
 
            /*
             * When constraint_exclusion is set to 'partition' we only handle
             * appendrel members.  Partition pruning has already been applied,
             * so there is no need to consider the rel's partition constraints
             * here.
             */
            if (rel->reloptkind == RELOPT_OTHER_MEMBER_REL)
                break;          /* appendrel member, so process it */
            return false;
 
        case CONSTRAINT_EXCLUSION_ON:
 
            /*
             * In 'on' mode, always apply constraint exclusion.  If we are
             * considering a baserel that is a partition (i.e., it was
             * directly named rather than expanded from a parent table), then
             * its partition constraints haven't been considered yet, so
             * include them in the processing here.
             */
            if (rel->reloptkind == RELOPT_BASEREL)
                include_partition = true;
            break;              /* always try to exclude */
    }
 
    /*
     * Check for self-contradictory restriction clauses.  We dare not make
     * deductions with non-immutable functions, but any immutable clauses that
     * are self-contradictory allow us to conclude the scan is unnecessary.
     *
     * Note: strip off RestrictInfo because predicate_refuted_by() isn't
     * expecting to see any in its predicate argument.
     */
    safe_restrictions = NIL;
    foreach(lc, rel->baserestrictinfo)
    {
        RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
 
        if (!contain_mutable_functions((Node *) rinfo->clause))
            safe_restrictions = lappend(safe_restrictions, rinfo->clause);
    }
 
    /*
     * We can use weak refutation here, since we're comparing restriction
     * clauses with restriction clauses.
     */
    if (predicate_refuted_by(safe_restrictions, safe_restrictions, true))
        return true;
 
    /*
     * Only plain relations have constraints, so stop here for other rtekinds.
     */
    if (rte->rtekind != RTE_RELATION)
        return false;
 
    /*
     * If we are scanning just this table, we can use NO INHERIT constraints,
     * but not if we're scanning its children too.  (Note that partitioned
     * tables should never have NO INHERIT constraints; but it's not necessary
     * for us to assume that here.)
     */
    include_noinherit = !rte->inh;
 
    /*
     * Currently, attnotnull constraints must be treated as NO INHERIT unless
     * this is a partitioned table.  In future we might track their
     * inheritance status more accurately, allowing this to be refined.
     *
     * XXX do we need/want to change this?
     */
    include_notnull = (!rte->inh || rte->relkind == RELKIND_PARTITIONED_TABLE);
 
    /*
     * Fetch the appropriate set of constraint expressions.
     */
    constraint_pred = get_relation_constraints(root, rte->relid, rel,
                                               include_noinherit,
                                               include_notnull,
                                               include_partition);
 
    /*
     * We do not currently enforce that CHECK constraints contain only
     * immutable functions, so it's necessary to check here. We daren't draw
     * conclusions from plan-time evaluation of non-immutable functions. Since
     * they're ANDed, we can just ignore any mutable constraints in the list,
     * and reason about the rest.
     */
    safe_constraints = NIL;
    foreach(lc, constraint_pred)
    {
        Node       *pred = (Node *) lfirst(lc);
 
        if (!contain_mutable_functions(pred))
            safe_constraints = lappend(safe_constraints, pred);
    }
 
    /*
     * The constraints are effectively ANDed together, so we can just try to
     * refute the entire collection at once.  This may allow us to make proofs
     * that would fail if we took them individually.
     *
     * Note: we use rel->baserestrictinfo, not safe_restrictions as might seem
     * an obvious optimization.  Some of the clauses might be OR clauses that
     * have volatile and nonvolatile subclauses, and it's OK to make
     * deductions with the nonvolatile parts.
     *
     * We need strong refutation because we have to prove that the constraints
     * would yield false, not just NULL.
     */
    if (predicate_refuted_by(safe_constraints, rel->baserestrictinfo, false))
        return true;
 
    return false;
}

References Assert(), RelOptInfo::baserestrictinfo, RestrictInfo::clause, constraint_exclusion, CONSTRAINT_EXCLUSION_OFF, CONSTRAINT_EXCLUSION_ON, CONSTRAINT_EXCLUSION_PARTITION, contain_mutable_functions(), DatumGetBool(), get_relation_constraints(), RangeTblEntry::inh, IS_SIMPLE_REL, IsA, lappend(), lfirst, linitial, list_length(), NIL, predicate_refuted_by(), RangeTblEntry::relid, RangeTblEntry::relkind, RELOPT_BASEREL, RELOPT_OTHER_MEMBER_REL, RelOptInfo::reloptkind, RTE_RELATION, and RangeTblEntry::rtekind.

Referenced by set_append_rel_size(), and set_rel_size().

restriction_selectivity()

Selectivity restriction_selectivity	(	PlannerInfo *	root,
		Oid	operatorid,
		List *	args,
		Oid	inputcollid,
		int	varRelid
	)

Definition at line 1901 of file plancat.c.

{
    RegProcedure oprrest = get_oprrest(operatorid);
    float8      result;
 
    /*
     * if the oprrest procedure is missing for whatever reason, use a
     * selectivity of 0.5
     */
    if (!oprrest)
        return (Selectivity) 0.5;
 
    result = DatumGetFloat8(OidFunctionCall4Coll(oprrest,
                                                 inputcollid,
                                                 PointerGetDatum(root),
                                                 ObjectIdGetDatum(operatorid),
                                                 PointerGetDatum(args),
                                                 Int32GetDatum(varRelid)));
 
    if (result < 0.0 || result > 1.0)
        elog(ERROR, "invalid restriction selectivity: %f", result);
 
    return (Selectivity) result;
}

References generate_unaccent_rules::args, DatumGetFloat8(), elog(), ERROR, get_oprrest(), Int32GetDatum(), ObjectIdGetDatum(), OidFunctionCall4Coll(), and PointerGetDatum().

Referenced by clause_selectivity_ext(), rowcomparesel(), and test_support_func().

set_baserel_partition_constraint()

static void set_baserel_partition_constraint ( Relation  relation, RelOptInfo *  rel  )

static

Definition at line 2524 of file plancat.c.

{
    List       *partconstr;
 
    if (rel->partition_qual)    /* already done */
        return;
 
    /*
     * Run the partition quals through const-simplification similar to check
     * constraints.  We skip canonicalize_qual, though, because partition
     * quals should be in canonical form already; also, since the qual is in
     * implicit-AND format, we'd have to explicitly convert it to explicit-AND
     * format and back again.
     */
    partconstr = RelationGetPartitionQual(relation);
    if (partconstr)
    {
        partconstr = (List *) expression_planner((Expr *) partconstr);
        if (rel->relid != 1)
            ChangeVarNodes((Node *) partconstr, 1, rel->relid, 0);
        rel->partition_qual = partconstr;
    }
}

References ChangeVarNodes(), expression_planner(), RelOptInfo::partition_qual, RelationGetPartitionQual(), and RelOptInfo::relid.

Referenced by get_relation_constraints(), and set_relation_partition_info().

set_baserel_partition_key_exprs()

static void set_baserel_partition_key_exprs ( Relation  relation, RelOptInfo *  rel  )

static

Definition at line 2456 of file plancat.c.

{
    PartitionKey partkey = RelationGetPartitionKey(relation);
    int         partnatts;
    int         cnt;
    List      **partexprs;
    ListCell   *lc;
    Index       varno = rel->relid;
 
    Assert(IS_SIMPLE_REL(rel) && rel->relid > 0);
 
    /* A partitioned table should have a partition key. */
    Assert(partkey != NULL);
 
    partnatts = partkey->partnatts;
    partexprs = (List **) palloc(sizeof(List *) * partnatts);
    lc = list_head(partkey->partexprs);
 
    for (cnt = 0; cnt < partnatts; cnt++)
    {
        Expr       *partexpr;
        AttrNumber  attno = partkey->partattrs[cnt];
 
        if (attno != InvalidAttrNumber)
        {
            /* Single column partition key is stored as a Var node. */
            Assert(attno > 0);
 
            partexpr = (Expr *) makeVar(varno, attno,
                                        partkey->parttypid[cnt],
                                        partkey->parttypmod[cnt],
                                        partkey->parttypcoll[cnt], 0);
        }
        else
        {
            if (lc == NULL)
                elog(ERROR, "wrong number of partition key expressions");
 
            /* Re-stamp the expression with given varno. */
            partexpr = (Expr *) copyObject(lfirst(lc));
            ChangeVarNodes((Node *) partexpr, 1, varno, 0);
            lc = lnext(partkey->partexprs, lc);
        }
 
        /* Base relations have a single expression per key. */
        partexprs[cnt] = list_make1(partexpr);
    }
 
    rel->partexprs = partexprs;
 
    /*
     * A base relation does not have nullable partition key expressions, since
     * no outer join is involved.  We still allocate an array of empty
     * expression lists to keep partition key expression handling code simple.
     * See build_joinrel_partition_info() and match_expr_to_partition_keys().
     */
    rel->nullable_partexprs = (List **) palloc0(sizeof(List *) * partnatts);
}

References Assert(), ChangeVarNodes(), copyObject, elog(), ERROR, InvalidAttrNumber, IS_SIMPLE_REL, lfirst, list_head(), list_make1, lnext(), makeVar(), palloc(), palloc0(), PartitionKeyData::partattrs, PartitionKeyData::partexprs, PartitionKeyData::partnatts, PartitionKeyData::parttypcoll, PartitionKeyData::parttypid, PartitionKeyData::parttypmod, RelationGetPartitionKey(), and RelOptInfo::relid.

Referenced by set_relation_partition_info().

set_relation_partition_info()

static void set_relation_partition_info ( PlannerInfo *  root, RelOptInfo *  rel, Relation  relation  )

static

Definition at line 2319 of file plancat.c.

{
    PartitionDesc partdesc;
 
    /*
     * Create the PartitionDirectory infrastructure if we didn't already.
     */
    if (root->glob->partition_directory == NULL)
    {
        root->glob->partition_directory =
            CreatePartitionDirectory(CurrentMemoryContext, true);
    }
 
    partdesc = PartitionDirectoryLookup(root->glob->partition_directory,
                                        relation);
    rel->part_scheme = find_partition_scheme(root, relation);
    Assert(partdesc != NULL && rel->part_scheme != NULL);
    rel->boundinfo = partdesc->boundinfo;
    rel->nparts = partdesc->nparts;
    set_baserel_partition_key_exprs(relation, rel);
    set_baserel_partition_constraint(relation, rel);
}

References Assert(), PartitionDescData::boundinfo, CreatePartitionDirectory(), CurrentMemoryContext, find_partition_scheme(), PlannerInfo::glob, RelOptInfo::nparts, PartitionDescData::nparts, PartitionDirectoryLookup(), set_baserel_partition_constraint(), and set_baserel_partition_key_exprs().

Referenced by get_relation_info().

Variable Documentation

constraint_exclusion

int constraint_exclusion = CONSTRAINT_EXCLUSION_PARTITION

Definition at line 58 of file plancat.c.

Referenced by relation_excluded_by_constraints().

get_relation_info_hook

get_relation_info_hook_type get_relation_info_hook = NULL

Definition at line 61 of file plancat.c.

Referenced by get_relation_info().