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Commit3f7626e

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A couple of marginal performance hacks for the information_schema views:
replace the old recursive-SQL-function implementation of _pg_keysequal()with use of the built-in array containment operators, and changetable_constraints' UNION to UNION ALL. Per discussion with Octavio Alvarez.initdb not forced since this doesn't affect results, but you'd need toinitdb or reload the information_schema to see the new definitions.
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‎src/backend/catalog/information_schema.sql

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@@ -4,7 +4,7 @@
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*
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* Copyright (c) 2003-2009, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.51 2009/02/06 21:15:11 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.52 2009/02/14 20:48:36 tgl Exp $
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*/
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/*
@@ -40,17 +40,9 @@ CREATE FUNCTION _pg_expandarray(IN anyarray, OUT x anyelement, OUT n int)
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pg_catalog.array_upper($1,1),
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1) as g(s)';
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CREATEFUNCTION_pg_keyissubset(smallint[],smallint[]) RETURNSboolean
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LANGUAGE sql
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IMMUTABLE
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RETURNSNULLONNULL INPUT
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AS'select $1[1] is null or ($1[1] = any ($2) and coalesce(information_schema._pg_keyissubset($1[2:pg_catalog.array_upper($1,1)], $2), true))';
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CREATEFUNCTION_pg_keysequal(smallint[],smallint[]) RETURNSboolean
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LANGUAGE sql
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IMMUTABLE
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RETURNSNULLONNULL INPUT
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AS'select information_schema._pg_keyissubset($1, $2) and information_schema._pg_keyissubset($2, $1)';
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LANGUAGE sql IMMUTABLE-- intentionally not STRICT, to allow inlining
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AS'select $1 <@ $2 and $2 <@ $1';
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/* Get the OID of the unique index that an FK constraint depends on*/
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CREATEFUNCTION_pg_underlying_index(oid) RETURNSoid
@@ -1793,7 +1785,7 @@ CREATE VIEW table_constraints AS
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OR has_table_privilege(r.oid,'INSERT, UPDATE, DELETE, TRUNCATE, REFERENCES, TRIGGER')
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OR has_any_column_privilege(r.oid,'INSERT, UPDATE, REFERENCES') )
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UNION
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UNION ALL
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-- not-null constraints
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