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Commit6cc2deb

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Add pg_describe_object function
This function is useful to obtain textual descriptions of objects asstored in pg_depend.
1 parent48c348f commit6cc2deb

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5 files changed

+48
-28
lines changed

5 files changed

+48
-28
lines changed

‎doc/src/sgml/func.sgml

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -12847,6 +12847,11 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
1284712847
<entry><type>setof oid</type></entry>
1284812848
<entry>get the set of database OIDs that have objects in the tablespace</entry>
1284912849
</row>
12850+
<row>
12851+
<entry><literal><function>pg_describe_object(<parameter>catalog_id</parameter>, <parameter>object_id</parameter>, <parameter>object_sub_id</parameter>)</function>)</literal></entry>
12852+
<entry><type>text</type></entry>
12853+
<entry>get description of a database object</entry>
12854+
</row>
1285012855
<row>
1285112856
<entry><literal><function>pg_typeof(<parameter>any</parameter>)</function></literal></entry>
1285212857
<entry><type>regtype</type></entry>
@@ -12940,6 +12945,13 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
1294012945
<structname>pg_class</> catalogs.
1294112946
</para>
1294212947

12948+
<para>
12949+
<function>pg_describe_object</function> returns a description of a database
12950+
object specified by catalog OID, object OID and a (possibly zero) sub-object ID.
12951+
This is useful to determine the identity of an object as stored in the
12952+
<structname>pg_depend</structname> catalog.
12953+
</para>
12954+
1294312955
<para>
1294412956
<function>pg_typeof</function> returns the OID of the data type of the
1294512957
value that is passed to it. This can be helpful for troubleshooting or

‎src/backend/catalog/dependency.c

Lines changed: 30 additions & 27 deletions
Original file line numberDiff line numberDiff line change
@@ -1982,118 +1982,97 @@ free_object_addresses(ObjectAddresses *addrs)
19821982
ObjectClass
19831983
getObjectClass(constObjectAddress*object)
19841984
{
1985+
/* only pg_class entries can have nonzero objectSubId */
1986+
if (object->classId!=RelationRelationId&&
1987+
object->objectSubId!=0)
1988+
elog(ERROR,"invalid objectSubId 0 for object class %u",
1989+
object->classId);
1990+
19851991
switch (object->classId)
19861992
{
19871993
caseRelationRelationId:
19881994
/* caller must check objectSubId */
19891995
returnOCLASS_CLASS;
19901996

19911997
caseProcedureRelationId:
1992-
Assert(object->objectSubId==0);
19931998
returnOCLASS_PROC;
19941999

19952000
caseTypeRelationId:
1996-
Assert(object->objectSubId==0);
19972001
returnOCLASS_TYPE;
19982002

19992003
caseCastRelationId:
2000-
Assert(object->objectSubId==0);
20012004
returnOCLASS_CAST;
20022005

20032006
caseConstraintRelationId:
2004-
Assert(object->objectSubId==0);
20052007
returnOCLASS_CONSTRAINT;
20062008

20072009
caseConversionRelationId:
2008-
Assert(object->objectSubId==0);
20092010
returnOCLASS_CONVERSION;
20102011

20112012
caseAttrDefaultRelationId:
2012-
Assert(object->objectSubId==0);
20132013
returnOCLASS_DEFAULT;
20142014

20152015
caseLanguageRelationId:
2016-
Assert(object->objectSubId==0);
20172016
returnOCLASS_LANGUAGE;
20182017

20192018
caseLargeObjectRelationId:
2020-
Assert(object->objectSubId==0);
20212019
returnOCLASS_LARGEOBJECT;
20222020

20232021
caseOperatorRelationId:
2024-
Assert(object->objectSubId==0);
20252022
returnOCLASS_OPERATOR;
20262023

20272024
caseOperatorClassRelationId:
2028-
Assert(object->objectSubId==0);
20292025
returnOCLASS_OPCLASS;
20302026

20312027
caseOperatorFamilyRelationId:
2032-
Assert(object->objectSubId==0);
20332028
returnOCLASS_OPFAMILY;
20342029

20352030
caseAccessMethodOperatorRelationId:
2036-
Assert(object->objectSubId==0);
20372031
returnOCLASS_AMOP;
20382032

20392033
caseAccessMethodProcedureRelationId:
2040-
Assert(object->objectSubId==0);
20412034
returnOCLASS_AMPROC;
20422035

20432036
caseRewriteRelationId:
2044-
Assert(object->objectSubId==0);
20452037
returnOCLASS_REWRITE;
20462038

20472039
caseTriggerRelationId:
2048-
Assert(object->objectSubId==0);
20492040
returnOCLASS_TRIGGER;
20502041

20512042
caseNamespaceRelationId:
2052-
Assert(object->objectSubId==0);
20532043
returnOCLASS_SCHEMA;
20542044

20552045
caseTSParserRelationId:
2056-
Assert(object->objectSubId==0);
20572046
returnOCLASS_TSPARSER;
20582047

20592048
caseTSDictionaryRelationId:
2060-
Assert(object->objectSubId==0);
20612049
returnOCLASS_TSDICT;
20622050

20632051
caseTSTemplateRelationId:
2064-
Assert(object->objectSubId==0);
20652052
returnOCLASS_TSTEMPLATE;
20662053

20672054
caseTSConfigRelationId:
2068-
Assert(object->objectSubId==0);
20692055
returnOCLASS_TSCONFIG;
20702056

20712057
caseAuthIdRelationId:
2072-
Assert(object->objectSubId==0);
20732058
returnOCLASS_ROLE;
20742059

20752060
caseDatabaseRelationId:
2076-
Assert(object->objectSubId==0);
20772061
returnOCLASS_DATABASE;
20782062

20792063
caseTableSpaceRelationId:
2080-
Assert(object->objectSubId==0);
20812064
returnOCLASS_TBLSPACE;
20822065

20832066
caseForeignDataWrapperRelationId:
2084-
Assert(object->objectSubId==0);
20852067
returnOCLASS_FDW;
20862068

20872069
caseForeignServerRelationId:
2088-
Assert(object->objectSubId==0);
20892070
returnOCLASS_FOREIGN_SERVER;
20902071

20912072
caseUserMappingRelationId:
2092-
Assert(object->objectSubId==0);
20932073
returnOCLASS_USER_MAPPING;
20942074

20952075
caseDefaultAclRelationId:
2096-
Assert(object->objectSubId==0);
20972076
returnOCLASS_DEFACL;
20982077
}
20992078

@@ -2807,3 +2786,27 @@ getOpFamilyDescription(StringInfo buffer, Oid opfid)
28072786
ReleaseSysCache(amTup);
28082787
ReleaseSysCache(opfTup);
28092788
}
2789+
2790+
/*
2791+
* SQL-level callable version of getObjectDescription
2792+
*/
2793+
Datum
2794+
pg_describe_object(PG_FUNCTION_ARGS)
2795+
{
2796+
Oidclassid=PG_GETARG_OID(0);
2797+
Oidobjid=PG_GETARG_OID(1);
2798+
int32subobjid=PG_GETARG_INT32(2);
2799+
char*description=NULL;
2800+
ObjectAddressaddress;
2801+
2802+
/* for "pinned" items in pg_depend, return null */
2803+
if (!OidIsValid(classid)&& !OidIsValid(objid))
2804+
PG_RETURN_NULL();
2805+
2806+
address.classId=classid;
2807+
address.objectId=objid;
2808+
address.objectSubId=subobjid;
2809+
2810+
description=getObjectDescription(&address);
2811+
PG_RETURN_TEXT_P(cstring_to_text(description));
2812+
}

‎src/include/catalog/catversion.h

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -53,6 +53,6 @@
5353
*/
5454

5555
/*yyyymmddN */
56-
#defineCATALOG_VERSION_NO201011151
56+
#defineCATALOG_VERSION_NO201011181
5757

5858
#endif

‎src/include/catalog/pg_proc.h

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -3333,6 +3333,8 @@ DESCR("view system lock information");
33333333
DATA(insertOID=1065 (pg_prepared_xactPGNSPPGUID12110000fffttv002249"""{28,25,1184,26,26}""{o,o,o,o,o}""{transaction,gid,prepared,ownerid,dbid}"_null_pg_prepared_xact_null__null__null_ ));
33343334
DESCR("view two-phase transactions");
33353335

3336+
DATA(insertOID=3537 (pg_describe_objectPGNSPPGUID12100ffftfs3025"26 26 23"_null__null__null__null_pg_describe_object_null__null__null_ ));
3337+
33363338
DATA(insertOID=2079 (pg_table_is_visiblePGNSPPGUID12100ffftfs1016"26"_null__null__null__null_pg_table_is_visible_null__null__null_ ));
33373339
DESCR("is table visible in search path?");
33383340
DATA(insertOID=2080 (pg_type_is_visiblePGNSPPGUID12100ffftfs1016"26"_null__null__null__null_pg_type_is_visible_null__null__null_ ));

‎src/include/utils/builtins.h

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1045,6 +1045,9 @@ extern Datum window_nth_value(PG_FUNCTION_ARGS);
10451045
/* access/transam/twophase.c */
10461046
externDatumpg_prepared_xact(PG_FUNCTION_ARGS);
10471047

1048+
/* catalogs/dependency.c */
1049+
externDatumpg_describe_object(PG_FUNCTION_ARGS);
1050+
10481051
/* commands/constraint.c */
10491052
externDatumunique_key_recheck(PG_FUNCTION_ARGS);
10501053

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