|
pg_statistic_ext
- extended planner statistics
+ extended planner statistics (definition)
+
+
+ |
+ pg_statistic_ext_data
+ extended planner statistics (built statistics)
|
The catalog pg_statistic_ext
- holds extended planner statistics.
+ holds definitions of extended planner statistics.
Each row in this catalog corresponds to a statistics object
created with .
+
+
+
+
+ The stxkind field is filled at creation of the
+ statistics object, indicating which statistic type(s) are desired. The
+ statistics (once computed by ANALYZE) are stored in
+ pg_statistic_ext_data
+ catalog.
+
+
+
+
+
<structname>pg_statistic_ext_data</structname>
+
+
+
+
+ The catalog pg_statistic_ext_data
+ holds data for extended planner statistics defined in pg_statistic_ext.
+ Each row in this catalog corresponds to a statistics object
+ created with .
+
+
+
+
<structname>pg_statistic_ext_data</structname> Columns
+
+
+
+ |
+ Name
+ Type
+ References
+ Description
+
+
+
+
+
+ |
+ stxoid
+ oid
+ pg_statistic_ext.oid
+ Extended statistic containing the definition for this data.
+
+
|
- stxndistinct
+ stxdndistinct
pg_ndistinct
|
- stxdependencies
+ stxddependencies
pg_dependencies
|
- stxmcv
+ stxdmcv
pg_mcv_list
- The stxkind field is filled at creation of the
- statistics object, indicating which statistic type(s) are desired.
- The fields after it are initially NULL and are filled only when the
- corresponding statistic has been computed by ANALYZE.
-
The pg_mcv_list_items function can be used like this:
-SELECT m.* FROM pg_statistic_ext,
- pg_mcv_list_items(stxmcv) m WHERE stxname = 'stts';
+SELECT m.* FROM pg_statistic_ext join pg_statistic_ext_data on (oid = stxoid),
+ pg_mcv_list_items(stxdmcv) m WHERE stxname = 'stts';
Values of the pg_mcv_list can be obtained only from the
- pg_statistic_ext.stxmcv column.
+ pg_statistic_ext_data.stxdmcv column.
+
+
+
It is common to see slow queries running bad execution plans because
multiple columns used in the query clauses are correlated.
interest in the statistics. Actual data collection is performed
by ANALYZE (either a manual command, or background
auto-analyze). The collected values can be examined in the
- ">pg_statistic_ext
+ -data">pg_statistic_ext_data
catalog.
ANALYZE zipcodes;
-SELECT stxname, stxkeys, stxdependencies
- FROM pg_statistic_ext
+SELECT stxname, stxkeys, stxddependencies
+ FROM pg_statistic_ext join pg_statistic_ext_data on (oid = stxoid)
WHERE stxname = 'stts';
- stxname | stxkeys | stxdependencies
+ stxname | stxkeys | stxddependencies
---------+---------+------------------------------------------
stts | 1 5 | {"1 => 5": 1.000000, "5 => 1": 0.423130}
(1 row)
ANALYZE zipcodes;
-SELECT stxkeys AS k, stxndistinct AS nd
- FROM pg_statistic_ext
+SELECT stxkeys AS k, stxdndistinct AS nd
+ FROM pg_statistic_ext join pg_statistic_ext_data on (oid = stxoid)
WHERE stxname = 'stts2';
-[ RECORD 1 ]--------------------------------------------------------
k | 1 2 5
ANALYZE zipcodes;
-SELECT m.* FROM pg_statistic_ext,
- pg_mcv_list_items(stxmcv) m WHERE stxname = 'stts3';
+SELECT m.* FROM pg_statistic_ext join pg_statistic_ext_data on (oid = stxoid),
+ pg_mcv_list_items(stxdmcv) m WHERE stxname = 'stts3';
index | values | nulls | frequency | base_frequency
-------+------------------------+-------+-----------+----------------
pg_mcv_list_items set-returning function.
-SELECT m.* FROM pg_statistic_ext,
- pg_mcv_list_items(stxmcv) m WHERE stxname = 'stts2';
+SELECT m.* FROM pg_statistic_ext join pg_statistic_ext_data on (oid = stxoid),
+ pg_mcv_list_items(stxdmcv) m WHERE stxname = 'stts2';
index | values | nulls | frequency | base_frequency
-------+----------+-------+-----------+----------------
0 | {0, 0} | {f,f} | 0.01 | 0.0001
pg_attrdef.h pg_constraint.h pg_inherits.h pg_index.h pg_operator.h \
pg_opfamily.h pg_opclass.h pg_am.h pg_amop.h pg_amproc.h \
pg_language.h pg_largeobject_metadata.h pg_largeobject.h pg_aggregate.h \
- pg_statistic_ext.h \
+ pg_statistic_ext.h pg_statistic_ext_data.h \
pg_statistic.h pg_rewrite.h pg_trigger.h pg_event_trigger.h pg_description.h \
pg_cast.h pg_enum.h pg_namespace.h pg_conversion.h pg_depend.h \
pg_database.h pg_db_role_setting.h pg_tablespace.h pg_pltemplate.h \
#include "catalog/namespace.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_statistic_ext.h"
+#include "catalog/pg_statistic_ext_data.h"
#include "commands/comment.h"
#include "commands/defrem.h"
#include "miscadmin.h"
HeapTuple htup;
Datum values[Natts_pg_statistic_ext];
bool nulls[Natts_pg_statistic_ext];
+ Datum datavalues[Natts_pg_statistic_ext_data];
+ bool datanulls[Natts_pg_statistic_ext_data];
int2vector *stxkeys;
Relation statrel;
+ Relation datarel;
Relation rel = NULL;
Oid relid;
ObjectAddress parentobject,
values[Anum_pg_statistic_ext_stxkeys - 1] = PointerGetDatum(stxkeys);
values[Anum_pg_statistic_ext_stxkind - 1] = PointerGetDatum(stxkind);
- /* no statistics built yet */
- nulls[Anum_pg_statistic_ext_stxndistinct - 1] = true;
- nulls[Anum_pg_statistic_ext_stxdependencies - 1] = true;
- nulls[Anum_pg_statistic_ext_stxmcv - 1] = true;
-
/* insert it into pg_statistic_ext */
htup = heap_form_tuple(statrel->rd_att, values, nulls);
CatalogTupleInsert(statrel, htup);
relation_close(statrel, RowExclusiveLock);
+ /*
+ * Also build the pg_statistic_ext_data tuple, to hold the actual
+ * statistics data.
+ */
+ datarel = table_open(StatisticExtDataRelationId, RowExclusiveLock);
+
+ memset(datavalues, 0, sizeof(datavalues));
+ memset(datanulls, false, sizeof(datanulls));
+
+ datavalues[Anum_pg_statistic_ext_data_stxoid - 1] = ObjectIdGetDatum(statoid);
+
+ /* no statistics built yet */
+ datanulls[Anum_pg_statistic_ext_data_stxdndistinct - 1] = true;
+ datanulls[Anum_pg_statistic_ext_data_stxddependencies - 1] = true;
+ datanulls[Anum_pg_statistic_ext_data_stxdmcv - 1] = true;
+
+ /* insert it into pg_statistic_ext_data */
+ htup = heap_form_tuple(datarel->rd_att, datavalues, datanulls);
+ CatalogTupleInsert(datarel, htup);
+ heap_freetuple(htup);
+
+ relation_close(datarel, RowExclusiveLock);
+
/*
* Invalidate relcache so that others see the new statistics object.
*/
Form_pg_statistic_ext statext;
Oid relid;
+ /*
+ * First delete the pg_statistic_ext_data tuple holding the actual
+ * statistical data.
+ */
+ relation = table_open(StatisticExtDataRelationId, RowExclusiveLock);
+
+ tup = SearchSysCache1(STATEXTDATASTXOID, ObjectIdGetDatum(statsOid));
+
+ if (!HeapTupleIsValid(tup)) /* should not happen */
+ elog(ERROR, "cache lookup failed for statistics data %u", statsOid);
+
+ CatalogTupleDelete(relation, &tup->t_self);
+
+ ReleaseSysCache(tup);
+
+ table_close(relation, RowExclusiveLock);
+
/*
* Delete the pg_statistic_ext tuple. Also send out a cache inval on the
* associated table, so that dependent plans will be rebuilt.
*
* This could throw an error if the type change can't be supported.
* If it can be supported, but the stats must be recomputed, a likely choice
- * would be to set the relevant column(s) of the pg_statistic_ext tuple to
- * null until the next ANALYZE. (Note that the type change hasn't actually
+ * would be to set the relevant column(s) of the pg_statistic_ext_data tuple
+ * to null until the next ANALYZE. (Note that the type change hasn't actually
* happened yet, so one option that's *not* on the table is to recompute
* immediately.)
*
Relation rel;
- Datum values[Natts_pg_statistic_ext];
- bool nulls[Natts_pg_statistic_ext];
- bool replaces[Natts_pg_statistic_ext];
+ Datum values[Natts_pg_statistic_ext_data];
+ bool nulls[Natts_pg_statistic_ext_data];
+ bool replaces[Natts_pg_statistic_ext_data];
- oldtup = SearchSysCache1(STATEXTOID, ObjectIdGetDatum(statsOid));
+ oldtup = SearchSysCache1(STATEXTDATASTXOID, ObjectIdGetDatum(statsOid));
if (!HeapTupleIsValid(oldtup))
elog(ERROR, "cache lookup failed for statistics object %u", statsOid);
* OK, we need to reset some statistics. So let's build the new tuple,
* replacing the affected statistics types with NULL.
*/
- memset(nulls, 0, Natts_pg_statistic_ext * sizeof(bool));
- memset(replaces, 0, Natts_pg_statistic_ext * sizeof(bool));
- memset(values, 0, Natts_pg_statistic_ext * sizeof(Datum));
+ memset(nulls, 0, Natts_pg_statistic_ext_data * sizeof(bool));
+ memset(replaces, 0, Natts_pg_statistic_ext_data * sizeof(bool));
+ memset(values, 0, Natts_pg_statistic_ext_data * sizeof(Datum));
- replaces[Anum_pg_statistic_ext_stxmcv - 1] = true;
- nulls[Anum_pg_statistic_ext_stxmcv - 1] = true;
+ replaces[Anum_pg_statistic_ext_data_stxdmcv - 1] = true;
+ nulls[Anum_pg_statistic_ext_data_stxdmcv - 1] = true;
- rel = heap_open(StatisticExtRelationId, RowExclusiveLock);
+ rel = heap_open(StatisticExtDataRelationId, RowExclusiveLock);
/* replace the old tuple */
stup = heap_modify_tuple(oldtup,
Oid statOid = lfirst_oid(l);
Form_pg_statistic_ext staForm;
HeapTuple htup;
+ HeapTuple dtup;
Bitmapset *keys = NULL;
int i;
elog(ERROR, "cache lookup failed for statistics object %u", statOid);
staForm = (Form_pg_statistic_ext) GETSTRUCT(htup);
+ dtup = SearchSysCache1(STATEXTDATASTXOID, ObjectIdGetDatum(statOid));
+ if (!HeapTupleIsValid(dtup))
+ elog(ERROR, "cache lookup failed for statistics object %u", statOid);
+
/*
* First, build the array of columns covered. This is ultimately
* wasted if no stats within the object have actually been built, but
keys = bms_add_member(keys, staForm->stxkeys.values[i]);
/* add one StatisticExtInfo for each kind built */
- if (statext_is_kind_built(htup, STATS_EXT_NDISTINCT))
+ if (statext_is_kind_built(dtup, STATS_EXT_NDISTINCT))
{
StatisticExtInfo *info = makeNode(StatisticExtInfo);
stainfos = lcons(info, stainfos);
}
- if (statext_is_kind_built(htup, STATS_EXT_DEPENDENCIES))
+ if (statext_is_kind_built(dtup, STATS_EXT_DEPENDENCIES))
{
StatisticExtInfo *info = makeNode(StatisticExtInfo);
stainfos = lcons(info, stainfos);
}
- if (statext_is_kind_built(htup, STATS_EXT_MCV))
+ if (statext_is_kind_built(dtup, STATS_EXT_MCV))
{
StatisticExtInfo *info = makeNode(StatisticExtInfo);
}
ReleaseSysCache(htup);
+ ReleaseSysCache(dtup);
bms_free(keys);
}
which however makes it more difficult to inspect the contents. To make that
easier, there's a SRF returning detailed information about the MCV lists.
- SELECT m.* FROM pg_statistic_ext,
- pg_mcv_list_items(stxmcv) m WHERE stxname = 'stts2';
+ SELECT m.* FROM pg_statistic_ext s,
+ pg_statistic_ext_data d,
+ pg_mcv_list_items(stxdmcv) m
+ WHERE s.stxname = 'stts2'
+ AND d.stxoid = s.oid;
It accepts one parameter - a pg_mcv_list value (which can only be obtained
-from pg_statistic_ext catalog, to defend against malicious input), and
+from pg_statistic_ext_data catalog, to defend against malicious input), and
returns these columns:
- item index (0, ..., (nitems-1))
#include "access/sysattr.h"
#include "catalog/pg_operator.h"
#include "catalog/pg_statistic_ext.h"
+#include "catalog/pg_statistic_ext_data.h"
#include "lib/stringinfo.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/clauses.h"
Datum deps;
HeapTuple htup;
- htup = SearchSysCache1(STATEXTOID, ObjectIdGetDatum(mvoid));
+ htup = SearchSysCache1(STATEXTDATASTXOID, ObjectIdGetDatum(mvoid));
if (!HeapTupleIsValid(htup))
elog(ERROR, "cache lookup failed for statistics object %u", mvoid);
- deps = SysCacheGetAttr(STATEXTOID, htup,
- Anum_pg_statistic_ext_stxdependencies, &isnull);
+ deps = SysCacheGetAttr(STATEXTDATASTXOID, htup,
+ Anum_pg_statistic_ext_data_stxddependencies, &isnull);
if (isnull)
elog(ERROR,
"requested statistic kind \"%c\" is not yet built for statistics object %u",
#include "catalog/indexing.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_statistic_ext.h"
+#include "catalog/pg_statistic_ext_data.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/clauses.h"
#include "optimizer/optimizer.h"
static List *fetch_statentries_for_relation(Relation pg_statext, Oid relid);
static VacAttrStats **lookup_var_attr_stats(Relation rel, Bitmapset *attrs,
int nvacatts, VacAttrStats **vacatts);
-static void statext_store(Relation pg_stext, Oid relid,
+static void statext_store(Oid relid,
MVNDistinct *ndistinct, MVDependencies *dependencies,
- MCVList *mcvlist, VacAttrStats **stats);
+ MCVList *mcv, VacAttrStats **stats);
/*
}
/* store the statistics in the catalog */
- statext_store(pg_stext, stat->statOid, ndistinct, dependencies, mcv, stats);
+ statext_store(stat->statOid, ndistinct, dependencies, mcv, stats);
}
table_close(pg_stext, RowExclusiveLock);
/*
* statext_is_kind_built
- * Is this stat kind built in the given pg_statistic_ext tuple?
+ * Is this stat kind built in the given pg_statistic_ext_data tuple?
*/
bool
statext_is_kind_built(HeapTuple htup, char type)
switch (type)
{
case STATS_EXT_NDISTINCT:
- attnum = Anum_pg_statistic_ext_stxndistinct;
+ attnum = Anum_pg_statistic_ext_data_stxdndistinct;
break;
case STATS_EXT_DEPENDENCIES:
- attnum = Anum_pg_statistic_ext_stxdependencies;
+ attnum = Anum_pg_statistic_ext_data_stxddependencies;
break;
case STATS_EXT_MCV:
- attnum = Anum_pg_statistic_ext_stxmcv;
+ attnum = Anum_pg_statistic_ext_data_stxdmcv;
break;
default:
/*
* statext_store
- * Serializes the statistics and stores them into the pg_statistic_ext tuple.
+ * Serializes the statistics and stores them into the pg_statistic_ext_data
+ * tuple.
*/
static void
-statext_store(Relation pg_stext, Oid statOid,
+statext_store(Oid statOid,
MVNDistinct *ndistinct, MVDependencies *dependencies,
MCVList *mcv, VacAttrStats **stats)
{
HeapTuple stup,
oldtup;
- Datum values[Natts_pg_statistic_ext];
- bool nulls[Natts_pg_statistic_ext];
- bool replaces[Natts_pg_statistic_ext];
+ Datum values[Natts_pg_statistic_ext_data];
+ bool nulls[Natts_pg_statistic_ext_data];
+ bool replaces[Natts_pg_statistic_ext_data];
+ Relation pg_stextdata;
memset(nulls, true, sizeof(nulls));
memset(replaces, false, sizeof(replaces));
memset(values, 0, sizeof(values));
/*
- * Construct a new pg_statistic_ext tuple, replacing the calculated stats.
+ * Construct a new pg_statistic_ext_data tuple, replacing the calculated
+ * stats.
*/
if (ndistinct != NULL)
{
bytea *data = statext_ndistinct_serialize(ndistinct);
- nulls[Anum_pg_statistic_ext_stxndistinct - 1] = (data == NULL);
- values[Anum_pg_statistic_ext_stxndistinct - 1] = PointerGetDatum(data);
+ nulls[Anum_pg_statistic_ext_data_stxdndistinct - 1] = (data == NULL);
+ values[Anum_pg_statistic_ext_data_stxdndistinct - 1] = PointerGetDatum(data);
}
if (dependencies != NULL)
{
bytea *data = statext_dependencies_serialize(dependencies);
- nulls[Anum_pg_statistic_ext_stxdependencies - 1] = (data == NULL);
- values[Anum_pg_statistic_ext_stxdependencies - 1] = PointerGetDatum(data);
+ nulls[Anum_pg_statistic_ext_data_stxddependencies - 1] = (data == NULL);
+ values[Anum_pg_statistic_ext_data_stxddependencies - 1] = PointerGetDatum(data);
}
-
if (mcv != NULL)
{
bytea *data = statext_mcv_serialize(mcv, stats);
- nulls[Anum_pg_statistic_ext_stxmcv - 1] = (data == NULL);
- values[Anum_pg_statistic_ext_stxmcv - 1] = PointerGetDatum(data);
+ nulls[Anum_pg_statistic_ext_data_stxdmcv - 1] = (data == NULL);
+ values[Anum_pg_statistic_ext_data_stxdmcv - 1] = PointerGetDatum(data);
}
/* always replace the value (either by bytea or NULL) */
- replaces[Anum_pg_statistic_ext_stxndistinct - 1] = true;
- replaces[Anum_pg_statistic_ext_stxdependencies - 1] = true;
- replaces[Anum_pg_statistic_ext_stxmcv - 1] = true;
+ replaces[Anum_pg_statistic_ext_data_stxdndistinct - 1] = true;
+ replaces[Anum_pg_statistic_ext_data_stxddependencies - 1] = true;
+ replaces[Anum_pg_statistic_ext_data_stxdmcv - 1] = true;
- /* there should already be a pg_statistic_ext tuple */
- oldtup = SearchSysCache1(STATEXTOID, ObjectIdGetDatum(statOid));
+ /* there should already be a pg_statistic_ext_data tuple */
+ oldtup = SearchSysCache1(STATEXTDATASTXOID, ObjectIdGetDatum(statOid));
if (!HeapTupleIsValid(oldtup))
elog(ERROR, "cache lookup failed for statistics object %u", statOid);
/* replace it */
+ pg_stextdata = table_open(StatisticExtDataRelationId, RowExclusiveLock);
+
stup = heap_modify_tuple(oldtup,
- RelationGetDescr(pg_stext),
+ RelationGetDescr(pg_stextdata),
values,
nulls,
replaces);
ReleaseSysCache(oldtup);
- CatalogTupleUpdate(pg_stext, &stup->t_self, stup);
+ CatalogTupleUpdate(pg_stextdata, &stup->t_self, stup);
heap_freetuple(stup);
+
+ table_close(pg_stextdata, RowExclusiveLock);
}
/* initialize multi-dimensional sort */
#include "access/htup_details.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_statistic_ext.h"
+#include "catalog/pg_statistic_ext_data.h"
#include "fmgr.h"
#include "funcapi.h"
#include "nodes/nodeFuncs.h"
MCVList *result;
bool isnull;
Datum mcvlist;
- HeapTuple htup = SearchSysCache1(STATEXTOID, ObjectIdGetDatum(mvoid));
+ HeapTuple htup = SearchSysCache1(STATEXTDATASTXOID, ObjectIdGetDatum(mvoid));
if (!HeapTupleIsValid(htup))
elog(ERROR, "cache lookup failed for statistics object %u", mvoid);
- mcvlist = SysCacheGetAttr(STATEXTOID, htup,
- Anum_pg_statistic_ext_stxmcv, &isnull);
+ mcvlist = SysCacheGetAttr(STATEXTDATASTXOID, htup,
+ Anum_pg_statistic_ext_data_stxdmcv, &isnull);
if (isnull)
elog(ERROR,
#include "access/htup_details.h"
#include "catalog/pg_statistic_ext.h"
+#include "catalog/pg_statistic_ext_data.h"
#include "utils/fmgrprotos.h"
#include "utils/lsyscache.h"
#include "lib/stringinfo.h"
Datum ndist;
HeapTuple htup;
- htup = SearchSysCache1(STATEXTOID, ObjectIdGetDatum(mvoid));
+ htup = SearchSysCache1(STATEXTDATASTXOID, ObjectIdGetDatum(mvoid));
if (!HeapTupleIsValid(htup))
elog(ERROR, "cache lookup failed for statistics object %u", mvoid);
- ndist = SysCacheGetAttr(STATEXTOID, htup,
- Anum_pg_statistic_ext_stxndistinct, &isnull);
+ ndist = SysCacheGetAttr(STATEXTDATASTXOID, htup,
+ Anum_pg_statistic_ext_data_stxdndistinct, &isnull);
if (isnull)
elog(ERROR,
"requested statistic kind \"%c\" is not yet built for statistics object %u",
#include "catalog/pg_replication_origin.h"
#include "catalog/pg_statistic.h"
#include "catalog/pg_statistic_ext.h"
+#include "catalog/pg_statistic_ext_data.h"
#include "catalog/pg_subscription.h"
#include "catalog/pg_subscription_rel.h"
#include "catalog/pg_tablespace.h"
},
32
},
+ {StatisticExtDataRelationId, /* STATEXTDATASTXOID */
+ StatisticExtDataStxoidIndexId,
+ 1,
+ {
+ Anum_pg_statistic_ext_data_stxoid,
+ 0,
+ 0,
+ 0
+ },
+ 4
+ },
{StatisticExtRelationId, /* STATEXTNAMENSP */
StatisticExtNameIndexId,
2,
*/
/* yyyymmddN */
-#define CATALOG_VERSION_NO 201906041
+#define CATALOG_VERSION_NO 201906151
#endif
DECLARE_UNIQUE_INDEX(pg_largeobject_metadata_oid_index, 2996, on pg_largeobject_metadata using btree(oid oid_ops));
#define LargeObjectMetadataOidIndexId 2996
-DECLARE_UNIQUE_INDEX(pg_statistic_ext_oid_index, 3380, on pg_statistic_ext using btree(oid oid_ops));
-#define StatisticExtOidIndexId 3380
-DECLARE_UNIQUE_INDEX(pg_statistic_ext_name_index, 3997, on pg_statistic_ext using btree(stxname name_ops, stxnamespace oid_ops));
-#define StatisticExtNameIndexId 3997
-DECLARE_INDEX(pg_statistic_ext_relid_index, 3379, on pg_statistic_ext using btree(stxrelid oid_ops));
-#define StatisticExtRelidIndexId 3379
-
DECLARE_UNIQUE_INDEX(pg_namespace_nspname_index, 2684, on pg_namespace using btree(nspname name_ops));
#define NamespaceNameIndexId 2684
DECLARE_UNIQUE_INDEX(pg_namespace_oid_index, 2685, on pg_namespace using btree(oid oid_ops));
DECLARE_UNIQUE_INDEX(pg_statistic_relid_att_inh_index, 2696, on pg_statistic using btree(starelid oid_ops, staattnum int2_ops, stainherit bool_ops));
#define StatisticRelidAttnumInhIndexId 2696
+DECLARE_UNIQUE_INDEX(pg_statistic_ext_oid_index, 3380, on pg_statistic_ext using btree(oid oid_ops));
+#define StatisticExtOidIndexId 3380
+DECLARE_UNIQUE_INDEX(pg_statistic_ext_name_index, 3997, on pg_statistic_ext using btree(stxname name_ops, stxnamespace oid_ops));
+#define StatisticExtNameIndexId 3997
+DECLARE_INDEX(pg_statistic_ext_relid_index, 3379, on pg_statistic_ext using btree(stxrelid oid_ops));
+#define StatisticExtRelidIndexId 3379
+
+DECLARE_UNIQUE_INDEX(pg_statistic_ext_data_stxoid_index, 3433, on pg_statistic_ext_data using btree(stxoid oid_ops));
+#define StatisticExtDataStxoidIndexId 3433
+
DECLARE_UNIQUE_INDEX(pg_tablespace_oid_index, 2697, on pg_tablespace using btree(oid oid_ops));
#define TablespaceOidIndexId 2697
DECLARE_UNIQUE_INDEX(pg_tablespace_spcname_index, 2698, on pg_tablespace using btree(spcname name_ops));
/*-------------------------------------------------------------------------
*
* pg_statistic_ext.h
- * definition of the "extended statistics" system catalog (pg_statistic_ext)
+ * definition of the "extended statistics" system catalog
+ * (pg_statistic_ext)
*
+ * Note that pg_statistic_ext contains the definitions of extended statistics
+ * objects, created by CREATE STATISTICS, but not the actual statistical data,
+ * created by running ANALYZE.
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
#ifdef CATALOG_VARLEN
char stxkind[1] BKI_FORCE_NOT_NULL; /* statistics kinds requested
* to build */
- pg_ndistinct stxndistinct; /* ndistinct coefficients (serialized) */
- pg_dependencies stxdependencies; /* dependencies (serialized) */
- pg_mcv_list stxmcv; /* MCV (serialized) */
#endif
} FormData_pg_statistic_ext;
--- /dev/null
+/*-------------------------------------------------------------------------
+ *
+ * pg_statistic_ext_data.h
+ * definition of the "extended statistics data" system catalog
+ * (pg_statistic_ext_data)
+ *
+ * This catalog stores the statistical data for extended statistics objects.
+ *
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/catalog/pg_statistic_ext_data.h
+ *
+ * NOTES
+ * The Catalog.pm module reads this file and derives schema
+ * information.
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_STATISTIC_EXT_DATA_H
+#define PG_STATISTIC_EXT_DATA_H
+
+#include "catalog/genbki.h"
+#include "catalog/pg_statistic_ext_data_d.h"
+
+/* ----------------
+ * pg_statistic_ext_data definition. cpp turns this into
+ * typedef struct FormData_pg_statistic_ext_data
+ * ----------------
+ */
+CATALOG(pg_statistic_ext_data,3429,StatisticExtDataRelationId)
+{
+ Oid stxoid; /* statistics object this data is for */
+
+#ifdef CATALOG_VARLEN /* variable-length fields start here */
+
+ pg_ndistinct stxdndistinct; /* ndistinct coefficients (serialized) */
+ pg_dependencies stxddependencies; /* dependencies (serialized) */
+ pg_mcv_list stxdmcv; /* MCV (serialized) */
+
+#endif
+
+} FormData_pg_statistic_ext_data;
+
+/* ----------------
+ * Form_pg_statistic_ext_data corresponds to a pointer to a tuple with
+ * the format of pg_statistic_ext_data relation.
+ * ----------------
+ */
+typedef FormData_pg_statistic_ext_data *Form_pg_statistic_ext_data;
+
+#endif /* PG_STATISTIC_EXT_DATA_H */
DECLARE_TOAST(pg_seclabel, 3598, 3599);
DECLARE_TOAST(pg_statistic, 2840, 2841);
DECLARE_TOAST(pg_statistic_ext, 3439, 3440);
+DECLARE_TOAST(pg_statistic_ext_data, 3430, 3431);
DECLARE_TOAST(pg_trigger, 2336, 2337);
DECLARE_TOAST(pg_ts_dict, 4169, 4170);
DECLARE_TOAST(pg_type, 4171, 4172);
REPLORIGNAME,
RULERELNAME,
SEQRELID,
+ STATEXTDATASTXOID,
STATEXTNAMENSP,
STATEXTOID,
STATRELATTINH,
------+----------
(0 rows)
+SELECT ctid, stxoid
+FROM pg_catalog.pg_statistic_ext_data fk
+WHERE stxoid != 0 AND
+ NOT EXISTS(SELECT 1 FROM pg_catalog.pg_statistic_ext pk WHERE pk.oid = fk.stxoid);
+ ctid | stxoid
+------+--------
+(0 rows)
+
SELECT ctid, spcowner
FROM pg_catalog.pg_tablespace fk
WHERE spcowner != 0 AND
pg_shseclabel|t
pg_statistic|t
pg_statistic_ext|t
+pg_statistic_ext_data|t
pg_subscription|t
pg_subscription_rel|t
pg_tablespace|t
-- correct command
CREATE STATISTICS s10 ON a, b, c FROM ndistinct;
ANALYZE ndistinct;
-SELECT stxkind, stxndistinct
- FROM pg_statistic_ext WHERE stxrelid = 'ndistinct'::regclass;
- stxkind | stxndistinct
+SELECT s.stxkind, d.stxdndistinct
+ FROM pg_statistic_ext s, pg_statistic_ext_data d
+ WHERE s.stxrelid = 'ndistinct'::regclass
+ AND d.stxoid = s.oid;
+ stxkind | stxdndistinct
---------+-----------------------------------------------------
{d,f,m} | {"3, 4": 11, "3, 6": 11, "4, 6": 11, "3, 4, 6": 11}
(1 row)
cash_words(mod(i,33)::int::money)
FROM generate_series(1,5000) s(i);
ANALYZE ndistinct;
-SELECT stxkind, stxndistinct
- FROM pg_statistic_ext WHERE stxrelid = 'ndistinct'::regclass;
- stxkind | stxndistinct
+SELECT s.stxkind, d.stxdndistinct
+ FROM pg_statistic_ext s, pg_statistic_ext_data d
+ WHERE s.stxrelid = 'ndistinct'::regclass
+ AND d.stxoid = s.oid;
+ stxkind | stxdndistinct
---------+------------------------------------------------------------
{d,f,m} | {"3, 4": 2550, "3, 6": 800, "4, 6": 1632, "3, 4, 6": 5000}
(1 row)
(1 row)
DROP STATISTICS s10;
-SELECT stxkind, stxndistinct
- FROM pg_statistic_ext WHERE stxrelid = 'ndistinct'::regclass;
- stxkind | stxndistinct
----------+--------------
+SELECT s.stxkind, d.stxdndistinct
+ FROM pg_statistic_ext s, pg_statistic_ext_data d
+ WHERE s.stxrelid = 'ndistinct'::regclass
+ AND d.stxoid = s.oid;
+ stxkind | stxdndistinct
+---------+---------------
(0 rows)
-- dropping the statistics results in under-estimates
-- check change of unrelated column type does not reset the MCV statistics
ALTER TABLE mcv_lists ALTER COLUMN d TYPE VARCHAR(64);
-SELECT stxmcv IS NOT NULL FROM pg_statistic_ext WHERE stxname = 'mcv_lists_stats';
+SELECT d.stxdmcv IS NOT NULL
+ FROM pg_statistic_ext s, pg_statistic_ext_data d
+ WHERE s.stxname = 'mcv_lists_stats'
+ AND d.stxoid = s.oid;
?column?
----------
t
TRUNCATE mcv_lists;
INSERT INTO mcv_lists (a, b, c) SELECT 1, 2, 3 FROM generate_series(1,1000) s(i);
ANALYZE mcv_lists;
-SELECT m.* FROM pg_statistic_ext,
- pg_mcv_list_items(stxmcv) m WHERE stxname = 'mcv_lists_stats';
+SELECT m.*
+ FROM pg_statistic_ext s, pg_statistic_ext_data d,
+ pg_mcv_list_items(d.stxdmcv) m
+ WHERE s.stxname = 'mcv_lists_stats'
+ AND d.stxoid = s.oid;
index | values | nulls | frequency | base_frequency
-------+-----------+---------+-----------+----------------
0 | {1, 2, 3} | {f,f,f} | 1 | 1
FROM pg_catalog.pg_statistic_ext fk
WHERE stxowner != 0 AND
NOT EXISTS(SELECT 1 FROM pg_catalog.pg_authid pk WHERE pk.oid = fk.stxowner);
+SELECT ctid, stxoid
+FROM pg_catalog.pg_statistic_ext_data fk
+WHERE stxoid != 0 AND
+ NOT EXISTS(SELECT 1 FROM pg_catalog.pg_statistic_ext pk WHERE pk.oid = fk.stxoid);
SELECT ctid, spcowner
FROM pg_catalog.pg_tablespace fk
WHERE spcowner != 0 AND
ANALYZE ndistinct;
-SELECT stxkind, stxndistinct
- FROM pg_statistic_ext WHERE stxrelid = 'ndistinct'::regclass;
+SELECT s.stxkind, d.stxdndistinct
+ FROM pg_statistic_ext s, pg_statistic_ext_data d
+ WHERE s.stxrelid = 'ndistinct'::regclass
+ AND d.stxoid = s.oid;
-- Hash Aggregate, thanks to estimates improved by the statistic
SELECT * FROM check_estimated_rows('SELECT COUNT(*) FROM ndistinct GROUP BY a, b');
ANALYZE ndistinct;
-SELECT stxkind, stxndistinct
- FROM pg_statistic_ext WHERE stxrelid = 'ndistinct'::regclass;
+SELECT s.stxkind, d.stxdndistinct
+ FROM pg_statistic_ext s, pg_statistic_ext_data d
+ WHERE s.stxrelid = 'ndistinct'::regclass
+ AND d.stxoid = s.oid;
-- correct esimates
SELECT * FROM check_estimated_rows('SELECT COUNT(*) FROM ndistinct GROUP BY a, b');
DROP STATISTICS s10;
-SELECT stxkind, stxndistinct
- FROM pg_statistic_ext WHERE stxrelid = 'ndistinct'::regclass;
+SELECT s.stxkind, d.stxdndistinct
+ FROM pg_statistic_ext s, pg_statistic_ext_data d
+ WHERE s.stxrelid = 'ndistinct'::regclass
+ AND d.stxoid = s.oid;
-- dropping the statistics results in under-estimates
SELECT * FROM check_estimated_rows('SELECT COUNT(*) FROM ndistinct GROUP BY a, b');
-- check change of unrelated column type does not reset the MCV statistics
ALTER TABLE mcv_lists ALTER COLUMN d TYPE VARCHAR(64);
-SELECT stxmcv IS NOT NULL FROM pg_statistic_ext WHERE stxname = 'mcv_lists_stats';
+SELECT d.stxdmcv IS NOT NULL
+ FROM pg_statistic_ext s, pg_statistic_ext_data d
+ WHERE s.stxname = 'mcv_lists_stats'
+ AND d.stxoid = s.oid;
-- check change of column type resets the MCV statistics
ALTER TABLE mcv_lists ALTER COLUMN c TYPE numeric;
INSERT INTO mcv_lists (a, b, c) SELECT 1, 2, 3 FROM generate_series(1,1000) s(i);
ANALYZE mcv_lists;
-SELECT m.* FROM pg_statistic_ext,
- pg_mcv_list_items(stxmcv) m WHERE stxname = 'mcv_lists_stats';
+SELECT m.*
+ FROM pg_statistic_ext s, pg_statistic_ext_data d,
+ pg_mcv_list_items(d.stxdmcv) m
+ WHERE s.stxname = 'mcv_lists_stats'
+ AND d.stxoid = s.oid;
-- mcv with arrays
CREATE TABLE mcv_lists_arrays (
FormData_pg_shdepend
FormData_pg_statistic
FormData_pg_statistic_ext
+FormData_pg_statistic_ext_data
FormData_pg_subscription
FormData_pg_subscription_rel
FormData_pg_tablespace
Form_pg_shdepend
Form_pg_statistic
Form_pg_statistic_ext
+Form_pg_statistic_ext_data
Form_pg_subscription
Form_pg_subscription_rel
Form_pg_tablespace
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