greenplumn pg_index 源码
greenplumn pg_index 代码
文件路径：/src/include/catalog/pg_index.h
/*-------------------------------------------------------------------------
*
* pg_index.h
* definition of the "index" system catalog (pg_index)
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/catalog/pg_index.h
*
* NOTES
* The Catalog.pm module reads this file and derives schema
* information.
*
*-------------------------------------------------------------------------
*/
#ifndef PG_INDEX_H
#define PG_INDEX_H
#include "catalog/genbki.h"
#include "catalog/pg_index_d.h"
/* ----------------
* pg_index definition. cpp turns this into
* typedef struct FormData_pg_index.
* ----------------
*/
CATALOG(pg_index,2610,IndexRelationId) BKI_SCHEMA_MACRO
{
Oid indexrelid; /* OID of the index */
Oid indrelid; /* OID of the relation it indexes */
int16 indnatts; /* total number of columns in index */
int16 indnkeyatts; /* number of key columns in index */
bool indisunique; /* is this a unique index? */
bool indisprimary; /* is this index for primary key? */
bool indisexclusion; /* is this index for exclusion constraint? */
bool indimmediate; /* is uniqueness enforced immediately? */
bool indisclustered; /* is this the index last clustered by? */
bool indisvalid; /* is this index valid for use by queries? */
bool indcheckxmin; /* must we wait for xmin to be old? */
bool indisready; /* is this index ready for inserts? */
bool indislive; /* is this index alive at all? */
bool indisreplident; /* is this index the identity for replication? */
/* variable-length fields start here, but we allow direct access to indkey */
int2vector indkey; /* column numbers of indexed cols, or 0 */
#ifdef CATALOG_VARLEN
oidvector indcollation; /* collation identifiers */
oidvector indclass; /* opclass identifiers */
int2vector indoption; /* per-column flags (AM-specific meanings) */
pg_node_tree indexprs; /* expression trees for index attributes that
* are not simple column references; one for
* each zero entry in indkey[] */
pg_node_tree indpred; /* expression tree for predicate, if a partial
* index; else NULL */
#endif
} FormData_pg_index;
/* GPDB added foreign key definitions for gpcheckcat. */
FOREIGN_KEY(indexrelid REFERENCES pg_class(oid));
FOREIGN_KEY(indrelid REFERENCES pg_class(oid));
/* alter table pg_index add vector_fk indclass on pg_opclass(oid); */
/* ----------------
* Form_pg_index corresponds to a pointer to a tuple with
* the format of pg_index relation.
* ----------------
*/
typedef FormData_pg_index *Form_pg_index;
#ifdef EXPOSE_TO_CLIENT_CODE
/*
* Index AMs that support ordered scans must support these two indoption
* bits. Otherwise, the content of the per-column indoption fields is
* open for future definition.
*/
#define INDOPTION_DESC 0x0001 /* values are in reverse order */
#define INDOPTION_NULLS_FIRST 0x0002 /* NULLs are first instead of last */
#endif /* EXPOSE_TO_CLIENT_CODE */
#endif /* PG_INDEX_H */
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