greenplumn pg_shdescription 源码
greenplumn pg_shdescription 代码
文件路径：/src/include/catalog/pg_shdescription.h
/*-------------------------------------------------------------------------
*
* pg_shdescription.h
* definition of the "shared description" system catalog
* (pg_shdescription)
*
* Because the contents of this table are taken from the *.dat files
* of other catalogs, there is no pg_shdescription.dat file. The initial
* contents are assembled by genbki.pl and loaded during initdb.
*
* NOTE: an object is identified by the OID of the row that primarily
* defines the object, plus the OID of the table that that row appears in.
* For example, a database is identified by the OID of its pg_database row
* plus the pg_class OID of table pg_database. This allows unique
* identification of objects without assuming that OIDs are unique
* across tables.
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/catalog/pg_shdescription.h
*
* NOTES
* The Catalog.pm module reads this file and derives schema
* information.
*
*-------------------------------------------------------------------------
*/
#ifndef PG_SHDESCRIPTION_H
#define PG_SHDESCRIPTION_H
#include "catalog/genbki.h"
#include "catalog/pg_shdescription_d.h"
/* ----------------
* pg_shdescription definition. cpp turns this into
* typedef struct FormData_pg_shdescription
* ----------------
*/
CATALOG(pg_shdescription,2396,SharedDescriptionRelationId) BKI_SHARED_RELATION
{
Oid objoid; /* OID of object itself */
Oid classoid; /* OID of table containing object */
#ifdef CATALOG_VARLEN /* variable-length fields start here */
text description BKI_FORCE_NOT_NULL; /* description of object */
#endif
} FormData_pg_shdescription;
/* GPDB added foreign key definitions for gpcheckcat. */
FOREIGN_KEY(classoid REFERENCES pg_class(oid));
/* ----------------
* Form_pg_shdescription corresponds to a pointer to a tuple with
* the format of pg_shdescription relation.
* ----------------
*/
typedef FormData_pg_shdescription * Form_pg_shdescription;
#endif /* PG_SHDESCRIPTION_H */
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