attribute_stats.c File Reference

#include "postgres.h"
#include "access/heapam.h"
#include "catalog/indexing.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_operator.h"
#include "nodes/nodeFuncs.h"
#include "statistics/statistics.h"
#include "statistics/stat_utils.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"

Include dependency graph for attribute_stats.c:

Go to the source code of this file.

Macros
#define	DEFAULT_NULL_FRAC   Float4GetDatum(0.0)
#define	DEFAULT_AVG_WIDTH   Int32GetDatum(0) /* unknown */
#define	DEFAULT_N_DISTINCT   Float4GetDatum(0.0) /* unknown */

Enumerations
enum	attribute_stats_argnum {   ATTRELATION_ARG = 0 , ATTNAME_ARG , INHERITED_ARG , NULL_FRAC_ARG ,   AVG_WIDTH_ARG , N_DISTINCT_ARG , MOST_COMMON_VALS_ARG , MOST_COMMON_FREQS_ARG ,   HISTOGRAM_BOUNDS_ARG , CORRELATION_ARG , MOST_COMMON_ELEMS_ARG , MOST_COMMON_ELEM_FREQS_ARG ,   ELEM_COUNT_HISTOGRAM_ARG , RANGE_LENGTH_HISTOGRAM_ARG , RANGE_EMPTY_FRAC_ARG , RANGE_BOUNDS_HISTOGRAM_ARG ,   NUM_ATTRIBUTE_STATS_ARGS }

Functions
static bool	attribute_statistics_update (FunctionCallInfo fcinfo, int elevel)
static Node *	get_attr_expr (Relation rel, int attnum)
static void	get_attr_stat_type (Oid reloid, AttrNumber attnum, int elevel, Oid *atttypid, int32 *atttypmod, char *atttyptype, Oid *atttypcoll, Oid *eq_opr, Oid *lt_opr)
static bool	get_elem_stat_type (Oid atttypid, char atttyptype, int elevel, Oid *elemtypid, Oid *elem_eq_opr)
static Datum	text_to_stavalues (const char *staname, FmgrInfo *array_in, Datum d, Oid typid, int32 typmod, int elevel, bool *ok)
static void	set_stats_slot (Datum *values, bool *nulls, bool *replaces, int16 stakind, Oid staop, Oid stacoll, Datum stanumbers, bool stanumbers_isnull, Datum stavalues, bool stavalues_isnull)
static void	upsert_pg_statistic (Relation starel, HeapTuple oldtup, Datum *values, bool *nulls, bool *replaces)
static bool	delete_pg_statistic (Oid reloid, AttrNumber attnum, bool stainherit)
static void	init_empty_stats_tuple (Oid reloid, int16 attnum, bool inherited, Datum *values, bool *nulls, bool *replaces)
Datum	pg_set_attribute_stats (PG_FUNCTION_ARGS)
Datum	pg_clear_attribute_stats (PG_FUNCTION_ARGS)
Datum	pg_restore_attribute_stats (PG_FUNCTION_ARGS)

Variables
static struct StatsArgInfo	attarginfo []

Macro Definition Documentation

DEFAULT_AVG_WIDTH

#define DEFAULT_AVG_WIDTH   Int32GetDatum(0) /* unknown */

Definition at line 34 of file attribute_stats.c.

DEFAULT_N_DISTINCT

#define DEFAULT_N_DISTINCT   Float4GetDatum(0.0) /* unknown */

Definition at line 35 of file attribute_stats.c.

DEFAULT_NULL_FRAC

#define DEFAULT_NULL_FRAC   Float4GetDatum(0.0)

Definition at line 33 of file attribute_stats.c.

Enumeration Type Documentation

attribute_stats_argnum

enum attribute_stats_argnum

Enumerator
ATTRELATION_ARG
ATTNAME_ARG
INHERITED_ARG
NULL_FRAC_ARG
AVG_WIDTH_ARG
N_DISTINCT_ARG
MOST_COMMON_VALS_ARG
MOST_COMMON_FREQS_ARG
HISTOGRAM_BOUNDS_ARG
CORRELATION_ARG
MOST_COMMON_ELEMS_ARG
MOST_COMMON_ELEM_FREQS_ARG
ELEM_COUNT_HISTOGRAM_ARG
RANGE_LENGTH_HISTOGRAM_ARG
RANGE_EMPTY_FRAC_ARG
RANGE_BOUNDS_HISTOGRAM_ARG
NUM_ATTRIBUTE_STATS_ARGS

Definition at line 37 of file attribute_stats.c.

{
    ATTRELATION_ARG = 0,
    ATTNAME_ARG,
    INHERITED_ARG,
    NULL_FRAC_ARG,
    AVG_WIDTH_ARG,
    N_DISTINCT_ARG,
    MOST_COMMON_VALS_ARG,
    MOST_COMMON_FREQS_ARG,
    HISTOGRAM_BOUNDS_ARG,
    CORRELATION_ARG,
    MOST_COMMON_ELEMS_ARG,
    MOST_COMMON_ELEM_FREQS_ARG,
    ELEM_COUNT_HISTOGRAM_ARG,
    RANGE_LENGTH_HISTOGRAM_ARG,
    RANGE_EMPTY_FRAC_ARG,
    RANGE_BOUNDS_HISTOGRAM_ARG,
    NUM_ATTRIBUTE_STATS_ARGS
};

Function Documentation

attribute_statistics_update()

static bool attribute_statistics_update ( FunctionCallInfo  fcinfo, int  elevel  )

static

Definition at line 116 of file attribute_stats.c.

{
    Oid         reloid;
    Name        attname;
    bool        inherited;
    AttrNumber  attnum;
 
    Relation    starel;
    HeapTuple   statup;
 
    Oid         atttypid = InvalidOid;
    int32       atttypmod;
    char        atttyptype;
    Oid         atttypcoll = InvalidOid;
    Oid         eq_opr = InvalidOid;
    Oid         lt_opr = InvalidOid;
 
    Oid         elemtypid = InvalidOid;
    Oid         elem_eq_opr = InvalidOid;
 
    FmgrInfo    array_in_fn;
 
    bool        do_mcv = !PG_ARGISNULL(MOST_COMMON_FREQS_ARG) &&
        !PG_ARGISNULL(MOST_COMMON_VALS_ARG);
    bool        do_histogram = !PG_ARGISNULL(HISTOGRAM_BOUNDS_ARG);
    bool        do_correlation = !PG_ARGISNULL(CORRELATION_ARG);
    bool        do_mcelem = !PG_ARGISNULL(MOST_COMMON_ELEMS_ARG) &&
        !PG_ARGISNULL(MOST_COMMON_ELEM_FREQS_ARG);
    bool        do_dechist = !PG_ARGISNULL(ELEM_COUNT_HISTOGRAM_ARG);
    bool        do_bounds_histogram = !PG_ARGISNULL(RANGE_BOUNDS_HISTOGRAM_ARG);
    bool        do_range_length_histogram = !PG_ARGISNULL(RANGE_LENGTH_HISTOGRAM_ARG) &&
        !PG_ARGISNULL(RANGE_EMPTY_FRAC_ARG);
 
    Datum       values[Natts_pg_statistic] = {0};
    bool        nulls[Natts_pg_statistic] = {0};
    bool        replaces[Natts_pg_statistic] = {0};
 
    bool        result = true;
 
    stats_check_required_arg(fcinfo, attarginfo, ATTRELATION_ARG);
    reloid = PG_GETARG_OID(ATTRELATION_ARG);
 
    if (RecoveryInProgress())
        ereport(ERROR,
                (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
                 errmsg("recovery is in progress"),
                 errhint("Statistics cannot be modified during recovery.")));
 
    /* lock before looking up attribute */
    stats_lock_check_privileges(reloid);
 
    stats_check_required_arg(fcinfo, attarginfo, ATTNAME_ARG);
    attname = PG_GETARG_NAME(ATTNAME_ARG);
    attnum = get_attnum(reloid, NameStr(*attname));
 
    if (attnum < 0)
        ereport(ERROR,
                (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                 errmsg("cannot modify statistics on system column \"%s\"",
                        NameStr(*attname))));
 
    if (attnum == InvalidAttrNumber)
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_COLUMN),
                 errmsg("column \"%s\" of relation \"%s\" does not exist",
                        NameStr(*attname), get_rel_name(reloid))));
 
    stats_check_required_arg(fcinfo, attarginfo, INHERITED_ARG);
    inherited = PG_GETARG_BOOL(INHERITED_ARG);
 
    /*
     * Check argument sanity. If some arguments are unusable, emit at elevel
     * and set the corresponding argument to NULL in fcinfo.
     */
 
    if (!stats_check_arg_array(fcinfo, attarginfo, MOST_COMMON_FREQS_ARG,
                               elevel))
    {
        do_mcv = false;
        result = false;
    }
 
    if (!stats_check_arg_array(fcinfo, attarginfo, MOST_COMMON_ELEM_FREQS_ARG,
                               elevel))
    {
        do_mcelem = false;
        result = false;
    }
    if (!stats_check_arg_array(fcinfo, attarginfo, ELEM_COUNT_HISTOGRAM_ARG,
                               elevel))
    {
        do_dechist = false;
        result = false;
    }
 
    if (!stats_check_arg_pair(fcinfo, attarginfo,
                              MOST_COMMON_VALS_ARG, MOST_COMMON_FREQS_ARG,
                              elevel))
    {
        do_mcv = false;
        result = false;
    }
 
    if (!stats_check_arg_pair(fcinfo, attarginfo,
                              MOST_COMMON_ELEMS_ARG,
                              MOST_COMMON_ELEM_FREQS_ARG, elevel))
    {
        do_mcelem = false;
        result = false;
    }
 
    if (!stats_check_arg_pair(fcinfo, attarginfo,
                              RANGE_LENGTH_HISTOGRAM_ARG,
                              RANGE_EMPTY_FRAC_ARG, elevel))
    {
        do_range_length_histogram = false;
        result = false;
    }
 
    /* derive information from attribute */
    get_attr_stat_type(reloid, attnum, elevel,
                       &atttypid, &atttypmod,
                       &atttyptype, &atttypcoll,
                       &eq_opr, &lt_opr);
 
    /* if needed, derive element type */
    if (do_mcelem || do_dechist)
    {
        if (!get_elem_stat_type(atttypid, atttyptype, elevel,
                                &elemtypid, &elem_eq_opr))
        {
            ereport(elevel,
                    (errmsg("unable to determine element type of attribute \"%s\"", NameStr(*attname)),
                     errdetail("Cannot set STATISTIC_KIND_MCELEM or STATISTIC_KIND_DECHIST.")));
            elemtypid = InvalidOid;
            elem_eq_opr = InvalidOid;
 
            do_mcelem = false;
            do_dechist = false;
            result = false;
        }
    }
 
    /* histogram and correlation require less-than operator */
    if ((do_histogram || do_correlation) && !OidIsValid(lt_opr))
    {
        ereport(elevel,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("could not determine less-than operator for attribute \"%s\"", NameStr(*attname)),
                 errdetail("Cannot set STATISTIC_KIND_HISTOGRAM or STATISTIC_KIND_CORRELATION.")));
 
        do_histogram = false;
        do_correlation = false;
        result = false;
    }
 
    /* only range types can have range stats */
    if ((do_range_length_histogram || do_bounds_histogram) &&
        !(atttyptype == TYPTYPE_RANGE || atttyptype == TYPTYPE_MULTIRANGE))
    {
        ereport(elevel,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("attribute \"%s\" is not a range type", NameStr(*attname)),
                 errdetail("Cannot set STATISTIC_KIND_RANGE_LENGTH_HISTOGRAM or STATISTIC_KIND_BOUNDS_HISTOGRAM.")));
 
        do_bounds_histogram = false;
        do_range_length_histogram = false;
        result = false;
    }
 
    fmgr_info(F_ARRAY_IN, &array_in_fn);
 
    starel = table_open(StatisticRelationId, RowExclusiveLock);
 
    statup = SearchSysCache3(STATRELATTINH, reloid, attnum, inherited);
 
    /* initialize from existing tuple if exists */
    if (HeapTupleIsValid(statup))
        heap_deform_tuple(statup, RelationGetDescr(starel), values, nulls);
    else
        init_empty_stats_tuple(reloid, attnum, inherited, values, nulls,
                               replaces);
 
    /* if specified, set to argument values */
    if (!PG_ARGISNULL(NULL_FRAC_ARG))
    {
        values[Anum_pg_statistic_stanullfrac - 1] = PG_GETARG_DATUM(NULL_FRAC_ARG);
        replaces[Anum_pg_statistic_stanullfrac - 1] = true;
    }
    if (!PG_ARGISNULL(AVG_WIDTH_ARG))
    {
        values[Anum_pg_statistic_stawidth - 1] = PG_GETARG_DATUM(AVG_WIDTH_ARG);
        replaces[Anum_pg_statistic_stawidth - 1] = true;
    }
    if (!PG_ARGISNULL(N_DISTINCT_ARG))
    {
        values[Anum_pg_statistic_stadistinct - 1] = PG_GETARG_DATUM(N_DISTINCT_ARG);
        replaces[Anum_pg_statistic_stadistinct - 1] = true;
    }
 
    /* STATISTIC_KIND_MCV */
    if (do_mcv)
    {
        bool        converted;
        Datum       stanumbers = PG_GETARG_DATUM(MOST_COMMON_FREQS_ARG);
        Datum       stavalues = text_to_stavalues("most_common_vals",
                                                  &array_in_fn,
                                                  PG_GETARG_DATUM(MOST_COMMON_VALS_ARG),
                                                  atttypid, atttypmod,
                                                  elevel, &converted);
 
        if (converted)
        {
            set_stats_slot(values, nulls, replaces,
                           STATISTIC_KIND_MCV,
                           eq_opr, atttypcoll,
                           stanumbers, false, stavalues, false);
        }
        else
            result = false;
    }
 
    /* STATISTIC_KIND_HISTOGRAM */
    if (do_histogram)
    {
        Datum       stavalues;
        bool        converted = false;
 
        stavalues = text_to_stavalues("histogram_bounds",
                                      &array_in_fn,
                                      PG_GETARG_DATUM(HISTOGRAM_BOUNDS_ARG),
                                      atttypid, atttypmod, elevel,
                                      &converted);
 
        if (converted)
        {
            set_stats_slot(values, nulls, replaces,
                           STATISTIC_KIND_HISTOGRAM,
                           lt_opr, atttypcoll,
                           0, true, stavalues, false);
        }
        else
            result = false;
    }
 
    /* STATISTIC_KIND_CORRELATION */
    if (do_correlation)
    {
        Datum       elems[] = {PG_GETARG_DATUM(CORRELATION_ARG)};
        ArrayType  *arry = construct_array_builtin(elems, 1, FLOAT4OID);
        Datum       stanumbers = PointerGetDatum(arry);
 
        set_stats_slot(values, nulls, replaces,
                       STATISTIC_KIND_CORRELATION,
                       lt_opr, atttypcoll,
                       stanumbers, false, 0, true);
    }
 
    /* STATISTIC_KIND_MCELEM */
    if (do_mcelem)
    {
        Datum       stanumbers = PG_GETARG_DATUM(MOST_COMMON_ELEM_FREQS_ARG);
        bool        converted = false;
        Datum       stavalues;
 
        stavalues = text_to_stavalues("most_common_elems",
                                      &array_in_fn,
                                      PG_GETARG_DATUM(MOST_COMMON_ELEMS_ARG),
                                      elemtypid, atttypmod,
                                      elevel, &converted);
 
        if (converted)
        {
            set_stats_slot(values, nulls, replaces,
                           STATISTIC_KIND_MCELEM,
                           elem_eq_opr, atttypcoll,
                           stanumbers, false, stavalues, false);
        }
        else
            result = false;
    }
 
    /* STATISTIC_KIND_DECHIST */
    if (do_dechist)
    {
        Datum       stanumbers = PG_GETARG_DATUM(ELEM_COUNT_HISTOGRAM_ARG);
 
        set_stats_slot(values, nulls, replaces,
                       STATISTIC_KIND_DECHIST,
                       elem_eq_opr, atttypcoll,
                       stanumbers, false, 0, true);
    }
 
    /*
     * STATISTIC_KIND_BOUNDS_HISTOGRAM
     *
     * This stakind appears before STATISTIC_KIND_RANGE_LENGTH_HISTOGRAM even
     * though it is numerically greater, and all other stakinds appear in
     * numerical order. We duplicate this quirk for consistency.
     */
    if (do_bounds_histogram)
    {
        bool        converted = false;
        Datum       stavalues;
 
        stavalues = text_to_stavalues("range_bounds_histogram",
                                      &array_in_fn,
                                      PG_GETARG_DATUM(RANGE_BOUNDS_HISTOGRAM_ARG),
                                      atttypid, atttypmod,
                                      elevel, &converted);
 
        if (converted)
        {
            set_stats_slot(values, nulls, replaces,
                           STATISTIC_KIND_BOUNDS_HISTOGRAM,
                           InvalidOid, InvalidOid,
                           0, true, stavalues, false);
        }
        else
            result = false;
    }
 
    /* STATISTIC_KIND_RANGE_LENGTH_HISTOGRAM */
    if (do_range_length_histogram)
    {
        /* The anyarray is always a float8[] for this stakind */
        Datum       elems[] = {PG_GETARG_DATUM(RANGE_EMPTY_FRAC_ARG)};
        ArrayType  *arry = construct_array_builtin(elems, 1, FLOAT4OID);
        Datum       stanumbers = PointerGetDatum(arry);
 
        bool        converted = false;
        Datum       stavalues;
 
        stavalues = text_to_stavalues("range_length_histogram",
                                      &array_in_fn,
                                      PG_GETARG_DATUM(RANGE_LENGTH_HISTOGRAM_ARG),
                                      FLOAT8OID, 0, elevel, &converted);
 
        if (converted)
        {
            set_stats_slot(values, nulls, replaces,
                           STATISTIC_KIND_RANGE_LENGTH_HISTOGRAM,
                           Float8LessOperator, InvalidOid,
                           stanumbers, false, stavalues, false);
        }
        else
            result = false;
    }
 
    upsert_pg_statistic(starel, statup, values, nulls, replaces);
 
    if (HeapTupleIsValid(statup))
        ReleaseSysCache(statup);
    table_close(starel, RowExclusiveLock);
 
    return result;
}

References attarginfo, attname, ATTNAME_ARG, attnum, ATTRELATION_ARG, AVG_WIDTH_ARG, construct_array_builtin(), CORRELATION_ARG, ELEM_COUNT_HISTOGRAM_ARG, ereport, errcode(), errdetail(), errhint(), errmsg(), ERROR, fmgr_info(), get_attnum(), get_attr_stat_type(), get_elem_stat_type(), get_rel_name(), heap_deform_tuple(), HeapTupleIsValid, HISTOGRAM_BOUNDS_ARG, INHERITED_ARG, init_empty_stats_tuple(), InvalidAttrNumber, InvalidOid, MOST_COMMON_ELEM_FREQS_ARG, MOST_COMMON_ELEMS_ARG, MOST_COMMON_FREQS_ARG, MOST_COMMON_VALS_ARG, N_DISTINCT_ARG, NameStr, NULL_FRAC_ARG, OidIsValid, PG_ARGISNULL, PG_GETARG_BOOL, PG_GETARG_DATUM, PG_GETARG_NAME, PG_GETARG_OID, PointerGetDatum(), RANGE_BOUNDS_HISTOGRAM_ARG, RANGE_EMPTY_FRAC_ARG, RANGE_LENGTH_HISTOGRAM_ARG, RecoveryInProgress(), RelationGetDescr, ReleaseSysCache(), RowExclusiveLock, SearchSysCache3(), set_stats_slot(), stats_check_arg_array(), stats_check_arg_pair(), stats_check_required_arg(), stats_lock_check_privileges(), table_close(), table_open(), text_to_stavalues(), upsert_pg_statistic(), and values.

Referenced by pg_restore_attribute_stats(), and pg_set_attribute_stats().

delete_pg_statistic()

static bool delete_pg_statistic ( Oid  reloid, AttrNumber  attnum, bool  stainherit  )

static

Definition at line 776 of file attribute_stats.c.

{
    Relation    sd = table_open(StatisticRelationId, RowExclusiveLock);
    HeapTuple   oldtup;
    bool        result = false;
 
    /* Is there already a pg_statistic tuple for this attribute? */
    oldtup = SearchSysCache3(STATRELATTINH,
                             ObjectIdGetDatum(reloid),
                             Int16GetDatum(attnum),
                             BoolGetDatum(stainherit));
 
    if (HeapTupleIsValid(oldtup))
    {
        CatalogTupleDelete(sd, &oldtup->t_self);
        ReleaseSysCache(oldtup);
        result = true;
    }
 
    table_close(sd, RowExclusiveLock);
 
    CommandCounterIncrement();
 
    return result;
}

References attnum, BoolGetDatum(), CatalogTupleDelete(), CommandCounterIncrement(), HeapTupleIsValid, Int16GetDatum(), ObjectIdGetDatum(), ReleaseSysCache(), RowExclusiveLock, SearchSysCache3(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by pg_clear_attribute_stats().

get_attr_expr()

static Node * get_attr_expr ( Relation  rel, int  attnum  )

static

Definition at line 481 of file attribute_stats.c.

{
    if ((rel->rd_rel->relkind == RELKIND_INDEX
         || (rel->rd_rel->relkind == RELKIND_PARTITIONED_INDEX))
        && (rel->rd_indexprs != NIL)
        && (rel->rd_index->indkey.values[attnum - 1] == 0))
    {
        ListCell   *indexpr_item = list_head(rel->rd_indexprs);
 
        for (int i = 0; i < attnum - 1; i++)
            if (rel->rd_index->indkey.values[i] == 0)
                indexpr_item = lnext(rel->rd_indexprs, indexpr_item);
 
        if (indexpr_item == NULL)   /* shouldn't happen */
            elog(ERROR, "too few entries in indexprs list");
 
        return (Node *) lfirst(indexpr_item);
    }
    return NULL;
}

References attnum, elog, ERROR, i, lfirst, list_head(), lnext(), NIL, RelationData::rd_index, RelationData::rd_indexprs, and RelationData::rd_rel.

Referenced by get_attr_stat_type().

get_attr_stat_type()

static void get_attr_stat_type ( Oid  reloid, AttrNumber  attnum, int  elevel, Oid *  atttypid, int32 *  atttypmod, char *  atttyptype, Oid *  atttypcoll, Oid *  eq_opr, Oid *  lt_opr  )

static

Definition at line 506 of file attribute_stats.c.

{
    Relation    rel = relation_open(reloid, AccessShareLock);
    Form_pg_attribute attr;
    HeapTuple   atup;
    Node       *expr;
    TypeCacheEntry *typcache;
 
    atup = SearchSysCache2(ATTNUM, ObjectIdGetDatum(reloid),
                           Int16GetDatum(attnum));
 
    /* Attribute not found */
    if (!HeapTupleIsValid(atup))
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_COLUMN),
                 errmsg("attribute %d of relation \"%s\" does not exist",
                        attnum, RelationGetRelationName(rel))));
 
    attr = (Form_pg_attribute) GETSTRUCT(atup);
 
    if (attr->attisdropped)
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_COLUMN),
                 errmsg("attribute %d of relation \"%s\" does not exist",
                        attnum, RelationGetRelationName(rel))));
 
    expr = get_attr_expr(rel, attr->attnum);
 
    /*
     * When analyzing an expression index, believe the expression tree's type
     * not the column datatype --- the latter might be the opckeytype storage
     * type of the opclass, which is not interesting for our purposes. This
     * mimics the behvior of examine_attribute().
     */
    if (expr == NULL)
    {
        *atttypid = attr->atttypid;
        *atttypmod = attr->atttypmod;
        *atttypcoll = attr->attcollation;
    }
    else
    {
        *atttypid = exprType(expr);
        *atttypmod = exprTypmod(expr);
 
        if (OidIsValid(attr->attcollation))
            *atttypcoll = attr->attcollation;
        else
            *atttypcoll = exprCollation(expr);
    }
    ReleaseSysCache(atup);
 
    /*
     * If it's a multirange, step down to the range type, as is done by
     * multirange_typanalyze().
     */
    if (type_is_multirange(*atttypid))
        *atttypid = get_multirange_range(*atttypid);
 
    /* finds the right operators even if atttypid is a domain */
    typcache = lookup_type_cache(*atttypid, TYPECACHE_LT_OPR | TYPECACHE_EQ_OPR);
    *atttyptype = typcache->typtype;
    *eq_opr = typcache->eq_opr;
    *lt_opr = typcache->lt_opr;
 
    /*
     * Special case: collation for tsvector is DEFAULT_COLLATION_OID. See
     * compute_tsvector_stats().
     */
    if (*atttypid == TSVECTOROID)
        *atttypcoll = DEFAULT_COLLATION_OID;
 
    relation_close(rel, NoLock);
}

References AccessShareLock, attnum, TypeCacheEntry::eq_opr, ereport, errcode(), errmsg(), ERROR, exprCollation(), exprType(), exprTypmod(), get_attr_expr(), get_multirange_range(), GETSTRUCT, HeapTupleIsValid, Int16GetDatum(), lookup_type_cache(), TypeCacheEntry::lt_opr, NoLock, ObjectIdGetDatum(), OidIsValid, relation_close(), relation_open(), RelationGetRelationName, ReleaseSysCache(), SearchSysCache2(), type_is_multirange(), TYPECACHE_EQ_OPR, TYPECACHE_LT_OPR, and TypeCacheEntry::typtype.

Referenced by attribute_statistics_update().

get_elem_stat_type()

static bool get_elem_stat_type ( Oid  atttypid, char  atttyptype, int  elevel, Oid *  elemtypid, Oid *  elem_eq_opr  )

static

Definition at line 588 of file attribute_stats.c.

{
    TypeCacheEntry *elemtypcache;
 
    if (atttypid == TSVECTOROID)
    {
        /*
         * Special case: element type for tsvector is text. See
         * compute_tsvector_stats().
         */
        *elemtypid = TEXTOID;
    }
    else
    {
        /* find underlying element type through any domain */
        *elemtypid = get_base_element_type(atttypid);
    }
 
    if (!OidIsValid(*elemtypid))
        return false;
 
    /* finds the right operator even if elemtypid is a domain */
    elemtypcache = lookup_type_cache(*elemtypid, TYPECACHE_EQ_OPR);
    if (!OidIsValid(elemtypcache->eq_opr))
        return false;
 
    *elem_eq_opr = elemtypcache->eq_opr;
 
    return true;
}

References TypeCacheEntry::eq_opr, get_base_element_type(), lookup_type_cache(), OidIsValid, and TYPECACHE_EQ_OPR.

Referenced by attribute_statistics_update().

init_empty_stats_tuple()

static void init_empty_stats_tuple ( Oid  reloid, int16  attnum, bool  inherited, Datum *  values, bool *  nulls, bool *  replaces  )

static

Definition at line 806 of file attribute_stats.c.

{
    memset(nulls, true, sizeof(bool) * Natts_pg_statistic);
    memset(replaces, true, sizeof(bool) * Natts_pg_statistic);
 
    /* must initialize non-NULL attributes */
 
    values[Anum_pg_statistic_starelid - 1] = ObjectIdGetDatum(reloid);
    nulls[Anum_pg_statistic_starelid - 1] = false;
    values[Anum_pg_statistic_staattnum - 1] = Int16GetDatum(attnum);
    nulls[Anum_pg_statistic_staattnum - 1] = false;
    values[Anum_pg_statistic_stainherit - 1] = BoolGetDatum(inherited);
    nulls[Anum_pg_statistic_stainherit - 1] = false;
 
    values[Anum_pg_statistic_stanullfrac - 1] = DEFAULT_NULL_FRAC;
    nulls[Anum_pg_statistic_stanullfrac - 1] = false;
    values[Anum_pg_statistic_stawidth - 1] = DEFAULT_AVG_WIDTH;
    nulls[Anum_pg_statistic_stawidth - 1] = false;
    values[Anum_pg_statistic_stadistinct - 1] = DEFAULT_N_DISTINCT;
    nulls[Anum_pg_statistic_stadistinct - 1] = false;
 
    /* initialize stakind, staop, and stacoll slots */
    for (int slotnum = 0; slotnum < STATISTIC_NUM_SLOTS; slotnum++)
    {
        values[Anum_pg_statistic_stakind1 + slotnum - 1] = (Datum) 0;
        nulls[Anum_pg_statistic_stakind1 + slotnum - 1] = false;
        values[Anum_pg_statistic_staop1 + slotnum - 1] = InvalidOid;
        nulls[Anum_pg_statistic_staop1 + slotnum - 1] = false;
        values[Anum_pg_statistic_stacoll1 + slotnum - 1] = InvalidOid;
        nulls[Anum_pg_statistic_stacoll1 + slotnum - 1] = false;
    }
}

References attnum, BoolGetDatum(), DEFAULT_AVG_WIDTH, DEFAULT_N_DISTINCT, DEFAULT_NULL_FRAC, Int16GetDatum(), InvalidOid, ObjectIdGetDatum(), STATISTIC_NUM_SLOTS, and values.

Referenced by attribute_statistics_update().

pg_clear_attribute_stats()

Datum pg_clear_attribute_stats

(

PG_FUNCTION_ARGS

)

Definition at line 871 of file attribute_stats.c.

{
    Oid         reloid;
    Name        attname;
    AttrNumber  attnum;
    bool        inherited;
 
    stats_check_required_arg(fcinfo, attarginfo, ATTRELATION_ARG);
    reloid = PG_GETARG_OID(ATTRELATION_ARG);
 
    if (RecoveryInProgress())
        ereport(ERROR,
                (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
                 errmsg("recovery is in progress"),
                 errhint("Statistics cannot be modified during recovery.")));
 
    stats_lock_check_privileges(reloid);
 
    stats_check_required_arg(fcinfo, attarginfo, ATTNAME_ARG);
    attname = PG_GETARG_NAME(ATTNAME_ARG);
    attnum = get_attnum(reloid, NameStr(*attname));
 
    if (attnum < 0)
        ereport(ERROR,
                (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                 errmsg("cannot clear statistics on system column \"%s\"",
                        NameStr(*attname))));
 
    if (attnum == InvalidAttrNumber)
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_COLUMN),
                 errmsg("column \"%s\" of relation \"%s\" does not exist",
                        NameStr(*attname), get_rel_name(reloid))));
 
    stats_check_required_arg(fcinfo, attarginfo, INHERITED_ARG);
    inherited = PG_GETARG_BOOL(INHERITED_ARG);
 
    delete_pg_statistic(reloid, attnum, inherited);
    PG_RETURN_VOID();
}

References attarginfo, attname, ATTNAME_ARG, attnum, ATTRELATION_ARG, delete_pg_statistic(), ereport, errcode(), errhint(), errmsg(), ERROR, get_attnum(), get_rel_name(), INHERITED_ARG, InvalidAttrNumber, NameStr, PG_GETARG_BOOL, PG_GETARG_NAME, PG_GETARG_OID, PG_RETURN_VOID, RecoveryInProgress(), stats_check_required_arg(), and stats_lock_check_privileges().

pg_restore_attribute_stats()

Datum pg_restore_attribute_stats

(

PG_FUNCTION_ARGS

)

Definition at line 913 of file attribute_stats.c.

{
    LOCAL_FCINFO(positional_fcinfo, NUM_ATTRIBUTE_STATS_ARGS);
    bool        result = true;
 
    InitFunctionCallInfoData(*positional_fcinfo, NULL, NUM_ATTRIBUTE_STATS_ARGS,
                             InvalidOid, NULL, NULL);
 
    if (!stats_fill_fcinfo_from_arg_pairs(fcinfo, positional_fcinfo,
                                          attarginfo, WARNING))
        result = false;
 
    if (!attribute_statistics_update(positional_fcinfo, WARNING))
        result = false;
 
    PG_RETURN_BOOL(result);
}

References attarginfo, attribute_statistics_update(), InitFunctionCallInfoData, InvalidOid, LOCAL_FCINFO, NUM_ATTRIBUTE_STATS_ARGS, PG_RETURN_BOOL, stats_fill_fcinfo_from_arg_pairs(), and WARNING.

pg_set_attribute_stats()

Datum pg_set_attribute_stats

(

PG_FUNCTION_ARGS

)

Definition at line 861 of file attribute_stats.c.

{
    attribute_statistics_update(fcinfo, ERROR);
    PG_RETURN_VOID();
}

References attribute_statistics_update(), ERROR, and PG_RETURN_VOID.

set_stats_slot()

static void set_stats_slot ( Datum *  values, bool *  nulls, bool *  replaces, int16  stakind, Oid  staop, Oid  stacoll, Datum  stanumbers, bool  stanumbers_isnull, Datum  stavalues, bool  stavalues_isnull  )

static

Definition at line 682 of file attribute_stats.c.

{
    int         slotidx;
    int         first_empty = -1;
    AttrNumber  stakind_attnum;
    AttrNumber  staop_attnum;
    AttrNumber  stacoll_attnum;
 
    /* find existing slot with given stakind */
    for (slotidx = 0; slotidx < STATISTIC_NUM_SLOTS; slotidx++)
    {
        stakind_attnum = Anum_pg_statistic_stakind1 - 1 + slotidx;
 
        if (first_empty < 0 &&
            DatumGetInt16(values[stakind_attnum]) == 0)
            first_empty = slotidx;
        if (DatumGetInt16(values[stakind_attnum]) == stakind)
            break;
    }
 
    if (slotidx >= STATISTIC_NUM_SLOTS && first_empty >= 0)
        slotidx = first_empty;
 
    if (slotidx >= STATISTIC_NUM_SLOTS)
        ereport(ERROR,
                (errmsg("maximum number of statistics slots exceeded: %d",
                        slotidx + 1)));
 
    stakind_attnum = Anum_pg_statistic_stakind1 - 1 + slotidx;
    staop_attnum = Anum_pg_statistic_staop1 - 1 + slotidx;
    stacoll_attnum = Anum_pg_statistic_stacoll1 - 1 + slotidx;
 
    if (DatumGetInt16(values[stakind_attnum]) != stakind)
    {
        values[stakind_attnum] = Int16GetDatum(stakind);
        replaces[stakind_attnum] = true;
    }
    if (DatumGetObjectId(values[staop_attnum]) != staop)
    {
        values[staop_attnum] = ObjectIdGetDatum(staop);
        replaces[staop_attnum] = true;
    }
    if (DatumGetObjectId(values[stacoll_attnum]) != stacoll)
    {
        values[stacoll_attnum] = ObjectIdGetDatum(stacoll);
        replaces[stacoll_attnum] = true;
    }
    if (!stanumbers_isnull)
    {
        values[Anum_pg_statistic_stanumbers1 - 1 + slotidx] = stanumbers;
        nulls[Anum_pg_statistic_stanumbers1 - 1 + slotidx] = false;
        replaces[Anum_pg_statistic_stanumbers1 - 1 + slotidx] = true;
    }
    if (!stavalues_isnull)
    {
        values[Anum_pg_statistic_stavalues1 - 1 + slotidx] = stavalues;
        nulls[Anum_pg_statistic_stavalues1 - 1 + slotidx] = false;
        replaces[Anum_pg_statistic_stavalues1 - 1 + slotidx] = true;
    }
}

References DatumGetInt16(), DatumGetObjectId(), ereport, errmsg(), ERROR, Int16GetDatum(), ObjectIdGetDatum(), STATISTIC_NUM_SLOTS, and values.

Referenced by attribute_statistics_update().

text_to_stavalues()

static Datum text_to_stavalues ( const char *  staname, FmgrInfo *  array_in, Datum  d, Oid  typid, int32  typmod, int  elevel, bool *  ok  )

static

Definition at line 628 of file attribute_stats.c.

{
    LOCAL_FCINFO(fcinfo, 8);
    char       *s;
    Datum       result;
    ErrorSaveContext escontext = {T_ErrorSaveContext};
 
    escontext.details_wanted = true;
 
    s = TextDatumGetCString(d);
 
    InitFunctionCallInfoData(*fcinfo, array_in, 3, InvalidOid,
                             (Node *) &escontext, NULL);
 
    fcinfo->args[0].value = CStringGetDatum(s);
    fcinfo->args[0].isnull = false;
    fcinfo->args[1].value = ObjectIdGetDatum(typid);
    fcinfo->args[1].isnull = false;
    fcinfo->args[2].value = Int32GetDatum(typmod);
    fcinfo->args[2].isnull = false;
 
    result = FunctionCallInvoke(fcinfo);
 
    pfree(s);
 
    if (escontext.error_occurred)
    {
        if (elevel != ERROR)
            escontext.error_data->elevel = elevel;
        ThrowErrorData(escontext.error_data);
        *ok = false;
        return (Datum) 0;
    }
 
    if (array_contains_nulls(DatumGetArrayTypeP(result)))
    {
        ereport(elevel,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("\"%s\" array cannot contain NULL values", staname)));
        *ok = false;
        return (Datum) 0;
    }
 
    *ok = true;
 
    return result;
}

References array_contains_nulls(), array_in(), CStringGetDatum(), DatumGetArrayTypeP, ErrorSaveContext::details_wanted, ErrorData::elevel, ereport, errcode(), errmsg(), ERROR, ErrorSaveContext::error_data, ErrorSaveContext::error_occurred, FunctionCallInvoke, InitFunctionCallInfoData, Int32GetDatum(), InvalidOid, LOCAL_FCINFO, ObjectIdGetDatum(), pfree(), TextDatumGetCString, and ThrowErrorData().

Referenced by attribute_statistics_update().

upsert_pg_statistic()

static void upsert_pg_statistic ( Relation  starel, HeapTuple  oldtup, Datum *  values, bool *  nulls, bool *  replaces  )

static

Definition at line 750 of file attribute_stats.c.

{
    HeapTuple   newtup;
 
    if (HeapTupleIsValid(oldtup))
    {
        newtup = heap_modify_tuple(oldtup, RelationGetDescr(starel),
                                   values, nulls, replaces);
        CatalogTupleUpdate(starel, &newtup->t_self, newtup);
    }
    else
    {
        newtup = heap_form_tuple(RelationGetDescr(starel), values, nulls);
        CatalogTupleInsert(starel, newtup);
    }
 
    heap_freetuple(newtup);
 
    CommandCounterIncrement();
}

References CatalogTupleInsert(), CatalogTupleUpdate(), CommandCounterIncrement(), heap_form_tuple(), heap_freetuple(), heap_modify_tuple(), HeapTupleIsValid, RelationGetDescr, HeapTupleData::t_self, and values.

Referenced by attribute_statistics_update().

Variable Documentation

attarginfo

struct StatsArgInfo attarginfo[]

static

Initial value:

=
{
    [ATTRELATION_ARG] = {"relation", REGCLASSOID},
    [ATTNAME_ARG] = {"attname", NAMEOID},
    [INHERITED_ARG] = {"inherited", BOOLOID},
    [NULL_FRAC_ARG] = {"null_frac", FLOAT4OID},
    [AVG_WIDTH_ARG] = {"avg_width", INT4OID},
    [N_DISTINCT_ARG] = {"n_distinct", FLOAT4OID},
    [MOST_COMMON_VALS_ARG] = {"most_common_vals", TEXTOID},
    [MOST_COMMON_FREQS_ARG] = {"most_common_freqs", FLOAT4ARRAYOID},
    [HISTOGRAM_BOUNDS_ARG] = {"histogram_bounds", TEXTOID},
    [CORRELATION_ARG] = {"correlation", FLOAT4OID},
    [MOST_COMMON_ELEMS_ARG] = {"most_common_elems", TEXTOID},
    [MOST_COMMON_ELEM_FREQS_ARG] = {"most_common_elem_freqs", FLOAT4ARRAYOID},
    [ELEM_COUNT_HISTOGRAM_ARG] = {"elem_count_histogram", FLOAT4ARRAYOID},
    [RANGE_LENGTH_HISTOGRAM_ARG] = {"range_length_histogram", TEXTOID},
    [RANGE_EMPTY_FRAC_ARG] = {"range_empty_frac", FLOAT4OID},
    [RANGE_BOUNDS_HISTOGRAM_ARG] = {"range_bounds_histogram", TEXTOID},
    [NUM_ATTRIBUTE_STATS_ARGS] = {0}
}

Definition at line 1 of file attribute_stats.c.

Referenced by attribute_statistics_update(), pg_clear_attribute_stats(), and pg_restore_attribute_stats().