greenplumn pg_statistic_ext 源码
greenplumn pg_statistic_ext 代码
文件路径：/src/include/catalog/pg_statistic_ext.h
/*-------------------------------------------------------------------------
*
* pg_statistic_ext.h
* 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
*
* src/include/catalog/pg_statistic_ext.h
*
* NOTES
* The Catalog.pm module reads this file and derives schema
* information.
*
*-------------------------------------------------------------------------
*/
#ifndef PG_STATISTIC_EXT_H
#define PG_STATISTIC_EXT_H
#include "catalog/genbki.h"
#include "catalog/pg_statistic_ext_d.h"
/* ----------------
* pg_statistic_ext definition. cpp turns this into
* typedef struct FormData_pg_statistic_ext
* ----------------
*/
CATALOG(pg_statistic_ext,3381,StatisticExtRelationId)
{
Oid oid; /* oid */
Oid stxrelid; /* relation containing attributes */
/* These two fields form the unique key for the entry: */
NameData stxname; /* statistics object name */
Oid stxnamespace; /* OID of statistics object's namespace */
Oid stxowner; /* statistics object's owner */
/*
* variable-length fields start here, but we allow direct access to
* stxkeys
*/
int2vector stxkeys; /* array of column keys */
#ifdef CATALOG_VARLEN
char stxkind[1] BKI_FORCE_NOT_NULL; /* statistics kinds requested
* to build */
#endif
} FormData_pg_statistic_ext;
/* ----------------
* Form_pg_statistic_ext corresponds to a pointer to a tuple with
* the format of pg_statistic_ext relation.
* ----------------
*/
typedef FormData_pg_statistic_ext *Form_pg_statistic_ext;
#ifdef EXPOSE_TO_CLIENT_CODE
#define STATS_EXT_NDISTINCT 'd'
#define STATS_EXT_DEPENDENCIES 'f'
#define STATS_EXT_MCV 'm'
#endif /* EXPOSE_TO_CLIENT_CODE */
#endif /* PG_STATISTIC_EXT_H */
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