| /*------------------------------------------------------------------------- |
| * |
| * pg_description.h |
| * definition of the "description" system catalog (pg_description) |
| * |
| * Because the contents of this table are taken from the *.dat files |
| * of other catalogs, there is no pg_description.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 function is identified by the OID of its pg_proc row |
| * plus the pg_class OID of table pg_proc. This allows unique identification |
| * of objects without assuming that OIDs are unique across tables. |
| * |
| * Since attributes don't have OIDs of their own, we identify an attribute |
| * comment by the objoid+classoid of its parent table, plus an "objsubid" |
| * giving the attribute column number. "objsubid" must be zero in a comment |
| * for a table itself, so that it is distinct from any column comment. |
| * Currently, objsubid is unused and zero for all other kinds of objects, |
| * but perhaps it might be useful someday to associate comments with |
| * constituent elements of other kinds of objects (arguments of a function, |
| * for example). |
| * |
| * |
| * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group |
| * Portions Copyright (c) 1994, Regents of the University of California |
| * |
| * src/include/catalog/pg_description.h |
| * |
| * NOTES |
| * The Catalog.pm module reads this file and derives schema |
| * information. |
| * |
| *------------------------------------------------------------------------- |
| */ |
| #ifndef PG_DESCRIPTION_H |
| #define PG_DESCRIPTION_H |
| |
| #include "catalog/genbki.h" |
| #include "catalog/pg_description_d.h" |
| |
| /* ---------------- |
| * pg_description definition. cpp turns this into |
| * typedef struct FormData_pg_description |
| * ---------------- |
| */ |
| CATALOG(pg_description,2609,DescriptionRelationId) |
| { |
| Oid objoid; /* OID of object itself */ |
| Oid classoid; /* OID of table containing object */ |
| int32 objsubid; /* column number, or 0 if not used */ |
| |
| #ifdef CATALOG_VARLEN /* variable-length fields start here */ |
| text description BKI_FORCE_NOT_NULL; /* description of object */ |
| #endif |
| } FormData_pg_description; |
| |
| /* GPDB added foreign key definitions for gpcheckcat. */ |
| FOREIGN_KEY(classoid REFERENCES pg_class(oid)); |
| |
| /* ---------------- |
| * Form_pg_description corresponds to a pointer to a tuple with |
| * the format of pg_description relation. |
| * ---------------- |
| */ |
| typedef FormData_pg_description * Form_pg_description; |
| |
| DECLARE_TOAST(pg_description, 2834, 2835); |
| |
| DECLARE_UNIQUE_INDEX_PKEY(pg_description_o_c_o_index, 2675, on pg_description using btree(objoid oid_ops, classoid oid_ops, objsubid int4_ops)); |
| #define DescriptionObjIndexId 2675 |
| |
| /* We do not use BKI_LOOKUP here because it causes problems for genbki.pl */ |
| DECLARE_FOREIGN_KEY((classoid), pg_class, (oid)); |
| |
| #endif /* PG_DESCRIPTION_H */ |
