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Simplify a couple of pg_dump and psql \d queries about index constraints

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by joining to pg_constraint.conindid, instead of the former technique of
joining indirectly through pg_depend.  This is much more straightforward
and probably faster as well.  I had originally desisted from changing these
queries when conindid was added because I was worried about losing
performance, but if we join on conrelid as well as conindid then the index
on conrelid can be used when pg_constraint is large.
This commit is contained in:
Tom Lane 2010-03-11 04:36:43 +00:00
parent 4df5c6c719
commit e6555b436e
2 changed files with 30 additions and 36 deletions
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16
src/bin/pg_dump/pg_dump.c
View File

@ -25,7 +25,7 @@
* http://archives.postgresql.org/pgsql-bugs/2010-02/msg00187.php
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_dump.c,v 1.577 2010/03/03 23:38:44 momjian Exp $
* $PostgreSQL: pgsql/src/bin/pg_dump/pg_dump.c,v 1.578 2010/03/11 04:36:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -3956,6 +3956,11 @@ getIndexes(TableInfo tblinfo[], int numTables)
* that is related by an internal dependency link to the index. If we
* find one, create a CONSTRAINT entry linked to the INDEX entry. We
* assume an index won't have more than one internal dependency.
*
* As of 9.0 we don't need to look at pg_depend but can check for
* a match to pg_constraint.conindid. The check on conrelid is
* redundant but useful because that column is indexed while conindid
* is not.
*/
resetPQExpBuffer(query);
if (g_fout->remoteVersion >= 90000)
@ -3975,13 +3980,10 @@ getIndexes(TableInfo tblinfo[], int numTables)
"array_to_string(t.reloptions, ', ') AS options "
"FROM pg_catalog.pg_index i "
"JOIN pg_catalog.pg_class t ON (t.oid = i.indexrelid) "
"LEFT JOIN pg_catalog.pg_depend d "
"ON (d.classid = t.tableoid "
"AND d.objid = t.oid "
"AND d.deptype = 'i') "
"LEFT JOIN pg_catalog.pg_constraint c "
"ON (d.refclassid = c.tableoid "
"AND d.refobjid = c.oid) "
"ON (i.indrelid = c.conrelid AND "
"i.indexrelid = c.conindid AND "
"c.contype IN ('p','u','x')) "
"WHERE i.indrelid = '%u'::pg_catalog.oid "
"ORDER BY indexname",
tbinfo->dobj.catId.oid);

50
src/bin/psql/describe.c
View File

@ -8,7 +8,7 @@
*
* Copyright (c) 2000-2010, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/bin/psql/describe.c,v 1.239 2010/03/01 20:55:45 heikki Exp $
* $PostgreSQL: pgsql/src/bin/psql/describe.c,v 1.240 2010/03/11 04:36:43 tgl Exp $
*/
#include "postgres_fe.h"
@ -1417,21 +1417,17 @@ describeOneTableDetails(const char *schemaname,
if (pset.sversion >= 90000)
appendPQExpBuffer(&buf,
" (NOT i.indimmediate) AND "
"EXISTS (SELECT 1 FROM pg_catalog.pg_depend d, "
"pg_catalog.pg_constraint con WHERE "
"d.classid = 'pg_catalog.pg_class'::pg_catalog.regclass AND "
"d.objid = i.indexrelid AND "
"d.refclassid = 'pg_catalog.pg_constraint'::pg_catalog.regclass AND "
"d.refobjid = con.oid AND d.deptype = 'i' AND "
"con.condeferrable) AS condeferrable,\n"
"EXISTS (SELECT 1 FROM pg_catalog.pg_constraint "
"WHERE conrelid = i.indrelid AND "
"conindid = i.indexrelid AND "
"contype IN ('p','u','x') AND "
"condeferrable) AS condeferrable,\n"
" (NOT i.indimmediate) AND "
"EXISTS (SELECT 1 FROM pg_catalog.pg_depend d, "
"pg_catalog.pg_constraint con WHERE "
"d.classid = 'pg_catalog.pg_class'::pg_catalog.regclass AND "
"d.objid = i.indexrelid AND "
"d.refclassid = 'pg_catalog.pg_constraint'::pg_catalog.regclass AND "
"d.refobjid = con.oid AND d.deptype = 'i' AND "
"con.condeferred) AS condeferred,\n");
"EXISTS (SELECT 1 FROM pg_catalog.pg_constraint "
"WHERE conrelid = i.indrelid AND "
"conindid = i.indexrelid AND "
"contype IN ('p','u','x') AND "
"condeferred) AS condeferred,\n");
else
appendPQExpBuffer(&buf,
" false AS condeferrable, false AS condeferred,\n");
@ -1553,21 +1549,17 @@ describeOneTableDetails(const char *schemaname,
if (pset.sversion >= 90000)
appendPQExpBuffer(&buf,
",\n (NOT i.indimmediate) AND "
"EXISTS (SELECT 1 FROM pg_catalog.pg_depend d, "
"pg_catalog.pg_constraint con WHERE "
"d.classid = 'pg_catalog.pg_class'::pg_catalog.regclass AND "
"d.objid = i.indexrelid AND "
"d.refclassid = 'pg_catalog.pg_constraint'::pg_catalog.regclass AND "
"d.refobjid = con.oid AND d.deptype = 'i' AND "
"con.condeferrable) AS condeferrable"
"EXISTS (SELECT 1 FROM pg_catalog.pg_constraint "
"WHERE conrelid = i.indrelid AND "
"conindid = i.indexrelid AND "
"contype IN ('p','u','x') AND "
"condeferrable) AS condeferrable"
",\n (NOT i.indimmediate) AND "
"EXISTS (SELECT 1 FROM pg_catalog.pg_depend d, "
"pg_catalog.pg_constraint con WHERE "
"d.classid = 'pg_catalog.pg_class'::pg_catalog.regclass AND "
"d.objid = i.indexrelid AND "
"d.refclassid = 'pg_catalog.pg_constraint'::pg_catalog.regclass AND "
"d.refobjid = con.oid AND d.deptype = 'i' AND "
"con.condeferred) AS condeferred");
"EXISTS (SELECT 1 FROM pg_catalog.pg_constraint "
"WHERE conrelid = i.indrelid AND "
"conindid = i.indexrelid AND "
"contype IN ('p','u','x') AND "
"condeferred) AS condeferred");
else
appendPQExpBuffer(&buf, ", false AS condeferrable, false AS condeferred");
if (pset.sversion >= 80000)