greenplumn pg_amproc 源码
greenplumn pg_amproc 代码
文件路径：/src/include/catalog/pg_amproc.h
/*-------------------------------------------------------------------------
*
* pg_amproc.h
* definition of the "access method procedure" system catalog (pg_amproc)
*
* The amproc table identifies support procedures associated with index
* operator families and classes. These procedures can't be listed in pg_amop
* since they are not the implementation of any indexable operator.
*
* The primary key for this table is <amprocfamily, amproclefttype,
* amprocrighttype, amprocnum>. The "default" support functions for a
* particular opclass within the family are those with amproclefttype =
* amprocrighttype = opclass's opcintype. These are the ones loaded into the
* relcache for an index and typically used for internal index operations.
* Other support functions are typically used to handle cross-type indexable
* operators with oprleft/oprright matching the entry's amproclefttype and
* amprocrighttype. The exact behavior depends on the index AM, however, and
* some don't pay attention to non-default functions at all.
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/catalog/pg_amproc.h
*
* NOTES
* The Catalog.pm module reads this file and derives schema
* information.
*
*-------------------------------------------------------------------------
*/
#ifndef PG_AMPROC_H
#define PG_AMPROC_H
#include "catalog/genbki.h"
#include "catalog/pg_amproc_d.h"
/* ----------------
* pg_amproc definition. cpp turns this into
* typedef struct FormData_pg_amproc
* ----------------
*/
CATALOG(pg_amproc,2603,AccessMethodProcedureRelationId)
{
Oid oid; /* oid */
/* the index opfamily this entry is for */
Oid amprocfamily BKI_LOOKUP(pg_opfamily);
/* procedure's left input data type */
Oid amproclefttype BKI_LOOKUP(pg_type);
/* procedure's right input data type */
Oid amprocrighttype BKI_LOOKUP(pg_type);
/* support procedure index */
int16 amprocnum;
/* OID of the proc */
regproc amproc BKI_LOOKUP(pg_proc);
} FormData_pg_amproc;
/* GPDB added foreign key definitions for gpcheckcat. */
FOREIGN_KEY(amprocfamily REFERENCES pg_opfamily(oid));
FOREIGN_KEY(amproclefttype REFERENCES pg_type(oid));
FOREIGN_KEY(amprocrighttype REFERENCES pg_type(oid));
FOREIGN_KEY(amproc REFERENCES pg_proc(oid));
/* ----------------
* Form_pg_amproc corresponds to a pointer to a tuple with
* the format of pg_amproc relation.
* ----------------
*/
typedef FormData_pg_amproc *Form_pg_amproc;
#endif /* PG_AMPROC_H */
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