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is_view seems unnecessarily slow

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql-hackers(at)postgreSQL(dot)org
Subject: is_view seems unnecessarily slow
Date: 2001-01-06 20:24:51
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Lists: pgsql-hackers
backend/commands/command.c has a routine is_view() that tests for
view-ness by scanning pg_rewrite (all of it) to see if the given
relation has any ON SELECT rules.

This is only used to disallow AlterTableAddConstraint and
LockTableCommand on views.  While I don't care much about the
performance of AlterTableAddConstraint, it does bug me that this
might slow down LOCK TABLE a good deal.

Any objection to replacing this routine by a test for relkind = VIEW?

			regards, tom lane


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