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Since extended statistic got introduced in PostgreSQL 10, there was a single catalog pg_statistic_ext storing both the definitions and built statistic. That's however problematic when a user is supposed to have access only to the definitions, but not to user data. Consider for example pg_dump on a database with RLS enabled - if the pg_statistic_ext catalog respects RLS (which it should, if it contains user data), pg_dump would not see any records and the result would not define any extended statistics. That would be a surprising behavior. Until now this was not a pressing issue, because the existing types of extended statistic (functional dependencies and ndistinct coefficients) do not include any user data directly. This changed with introduction of MCV lists, which do include most common combinations of values. The easiest way to fix this is to split the pg_statistic_ext catalog into two - one for definitions, one for the built statistic values. The new catalog is called pg_statistic_ext_data, and we're maintaining a 1:1 relationship with the old catalog - either there are matching records in both catalogs, or neither of them. Bumped CATVERSION due to changing system catalog definitions. Author: Dean Rasheed, with improvements by me Reviewed-by: Dean Rasheed, John Naylor Discussion: https://postgr.es/m/CAEZATCUhT9rt7Ui%3DVdx4N%3D%3DVV5XOK5dsXfnGgVOz_JhAicB%3DZA%40mail.gmail.com
220 lines
6.3 KiB
C
220 lines
6.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* syscache.h
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* System catalog cache definitions.
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*
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* See also lsyscache.h, which provides convenience routines for
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* common cache-lookup operations.
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*
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* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/utils/syscache.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SYSCACHE_H
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#define SYSCACHE_H
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#include "access/attnum.h"
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#include "access/htup.h"
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/* we intentionally do not include utils/catcache.h here */
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/*
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* SysCache identifiers.
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*
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* The order of these identifiers must match the order
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* of the entries in the array cacheinfo[] in syscache.c.
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* Keep them in alphabetical order (renumbering only costs a
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* backend rebuild).
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*/
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enum SysCacheIdentifier
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{
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AGGFNOID = 0,
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AMNAME,
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AMOID,
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AMOPOPID,
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AMOPSTRATEGY,
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AMPROCNUM,
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ATTNAME,
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ATTNUM,
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AUTHMEMMEMROLE,
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AUTHMEMROLEMEM,
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AUTHNAME,
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AUTHOID,
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CASTSOURCETARGET,
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CLAAMNAMENSP,
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CLAOID,
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COLLNAMEENCNSP,
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COLLOID,
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CONDEFAULT,
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CONNAMENSP,
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CONSTROID,
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CONVOID,
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DATABASEOID,
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DEFACLROLENSPOBJ,
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ENUMOID,
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ENUMTYPOIDNAME,
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EVENTTRIGGERNAME,
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EVENTTRIGGEROID,
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FOREIGNDATAWRAPPERNAME,
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FOREIGNDATAWRAPPEROID,
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FOREIGNSERVERNAME,
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FOREIGNSERVEROID,
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FOREIGNTABLEREL,
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INDEXRELID,
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LANGNAME,
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LANGOID,
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NAMESPACENAME,
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NAMESPACEOID,
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OPERNAMENSP,
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OPEROID,
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OPFAMILYAMNAMENSP,
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OPFAMILYOID,
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PARTRELID,
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PROCNAMEARGSNSP,
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PROCOID,
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PUBLICATIONNAME,
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PUBLICATIONOID,
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PUBLICATIONREL,
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PUBLICATIONRELMAP,
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RANGETYPE,
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RELNAMENSP,
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RELOID,
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REPLORIGIDENT,
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REPLORIGNAME,
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RULERELNAME,
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SEQRELID,
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STATEXTDATASTXOID,
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STATEXTNAMENSP,
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STATEXTOID,
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STATRELATTINH,
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SUBSCRIPTIONNAME,
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SUBSCRIPTIONOID,
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SUBSCRIPTIONRELMAP,
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TABLESPACEOID,
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TRFOID,
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TRFTYPELANG,
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TSCONFIGMAP,
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TSCONFIGNAMENSP,
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TSCONFIGOID,
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TSDICTNAMENSP,
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TSDICTOID,
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TSPARSERNAMENSP,
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TSPARSEROID,
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TSTEMPLATENAMENSP,
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TSTEMPLATEOID,
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TYPENAMENSP,
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TYPEOID,
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USERMAPPINGOID,
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USERMAPPINGUSERSERVER
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#define SysCacheSize (USERMAPPINGUSERSERVER + 1)
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};
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extern void InitCatalogCache(void);
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extern void InitCatalogCachePhase2(void);
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extern HeapTuple SearchSysCache(int cacheId,
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Datum key1, Datum key2, Datum key3, Datum key4);
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/*
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* The use of argument specific numbers is encouraged. They're faster, and
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* insulates the caller from changes in the maximum number of keys.
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*/
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extern HeapTuple SearchSysCache1(int cacheId,
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Datum key1);
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extern HeapTuple SearchSysCache2(int cacheId,
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Datum key1, Datum key2);
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extern HeapTuple SearchSysCache3(int cacheId,
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Datum key1, Datum key2, Datum key3);
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extern HeapTuple SearchSysCache4(int cacheId,
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Datum key1, Datum key2, Datum key3, Datum key4);
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extern void ReleaseSysCache(HeapTuple tuple);
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/* convenience routines */
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extern HeapTuple SearchSysCacheCopy(int cacheId,
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Datum key1, Datum key2, Datum key3, Datum key4);
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extern bool SearchSysCacheExists(int cacheId,
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Datum key1, Datum key2, Datum key3, Datum key4);
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extern Oid GetSysCacheOid(int cacheId, AttrNumber oidcol,
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Datum key1, Datum key2, Datum key3, Datum key4);
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extern HeapTuple SearchSysCacheAttName(Oid relid, const char *attname);
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extern HeapTuple SearchSysCacheCopyAttName(Oid relid, const char *attname);
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extern bool SearchSysCacheExistsAttName(Oid relid, const char *attname);
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extern HeapTuple SearchSysCacheAttNum(Oid relid, int16 attnum);
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extern HeapTuple SearchSysCacheCopyAttNum(Oid relid, int16 attnum);
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extern Datum SysCacheGetAttr(int cacheId, HeapTuple tup,
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AttrNumber attributeNumber, bool *isNull);
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extern uint32 GetSysCacheHashValue(int cacheId,
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Datum key1, Datum key2, Datum key3, Datum key4);
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/* list-search interface. Users of this must import catcache.h too */
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struct catclist;
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extern struct catclist *SearchSysCacheList(int cacheId, int nkeys,
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Datum key1, Datum key2, Datum key3);
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extern void SysCacheInvalidate(int cacheId, uint32 hashValue);
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extern bool RelationInvalidatesSnapshotsOnly(Oid relid);
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extern bool RelationHasSysCache(Oid relid);
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extern bool RelationSupportsSysCache(Oid relid);
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/*
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* The use of the macros below rather than direct calls to the corresponding
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* functions is encouraged, as it insulates the caller from changes in the
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* maximum number of keys.
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*/
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#define SearchSysCacheCopy1(cacheId, key1) \
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SearchSysCacheCopy(cacheId, key1, 0, 0, 0)
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#define SearchSysCacheCopy2(cacheId, key1, key2) \
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SearchSysCacheCopy(cacheId, key1, key2, 0, 0)
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#define SearchSysCacheCopy3(cacheId, key1, key2, key3) \
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SearchSysCacheCopy(cacheId, key1, key2, key3, 0)
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#define SearchSysCacheCopy4(cacheId, key1, key2, key3, key4) \
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SearchSysCacheCopy(cacheId, key1, key2, key3, key4)
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#define SearchSysCacheExists1(cacheId, key1) \
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SearchSysCacheExists(cacheId, key1, 0, 0, 0)
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#define SearchSysCacheExists2(cacheId, key1, key2) \
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SearchSysCacheExists(cacheId, key1, key2, 0, 0)
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#define SearchSysCacheExists3(cacheId, key1, key2, key3) \
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SearchSysCacheExists(cacheId, key1, key2, key3, 0)
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#define SearchSysCacheExists4(cacheId, key1, key2, key3, key4) \
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SearchSysCacheExists(cacheId, key1, key2, key3, key4)
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#define GetSysCacheOid1(cacheId, oidcol, key1) \
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GetSysCacheOid(cacheId, oidcol, key1, 0, 0, 0)
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#define GetSysCacheOid2(cacheId, oidcol, key1, key2) \
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GetSysCacheOid(cacheId, oidcol, key1, key2, 0, 0)
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#define GetSysCacheOid3(cacheId, oidcol, key1, key2, key3) \
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GetSysCacheOid(cacheId, oidcol, key1, key2, key3, 0)
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#define GetSysCacheOid4(cacheId, oidcol, key1, key2, key3, key4) \
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GetSysCacheOid(cacheId, oidcol, key1, key2, key3, key4)
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#define GetSysCacheHashValue1(cacheId, key1) \
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GetSysCacheHashValue(cacheId, key1, 0, 0, 0)
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#define GetSysCacheHashValue2(cacheId, key1, key2) \
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GetSysCacheHashValue(cacheId, key1, key2, 0, 0)
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#define GetSysCacheHashValue3(cacheId, key1, key2, key3) \
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GetSysCacheHashValue(cacheId, key1, key2, key3, 0)
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#define GetSysCacheHashValue4(cacheId, key1, key2, key3, key4) \
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GetSysCacheHashValue(cacheId, key1, key2, key3, key4)
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#define SearchSysCacheList1(cacheId, key1) \
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SearchSysCacheList(cacheId, 1, key1, 0, 0)
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#define SearchSysCacheList2(cacheId, key1, key2) \
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SearchSysCacheList(cacheId, 2, key1, key2, 0)
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#define SearchSysCacheList3(cacheId, key1, key2, key3) \
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SearchSysCacheList(cacheId, 3, key1, key2, key3)
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#define ReleaseSysCacheList(x) ReleaseCatCacheList(x)
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#endif /* SYSCACHE_H */
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