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pgsql: Fix "cannot handle unplanned sub-select" error that can occur

From: tgl(at)postgresql(dot)org (Tom Lane)
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql: Fix "cannot handle unplanned sub-select" error that can occur
Date: 2010-07-08 00:14:16
Message-ID: 20100708001416.74B307541D4@cvs.postgresql.org (view raw or flat)
Thread:
Lists: pgsql-committers
Log Message:
-----------
Fix "cannot handle unplanned sub-select" error that can occur when a
sub-select contains a join alias reference that expands into an expression
containing another sub-select.  Per yesterday's report from Merlin Moncure
and subsequent off-list investigation.

Back-patch to 7.4.  Older versions didn't attempt to flatten sub-selects in
ways that would trigger this problem.

Tags:
----
REL8_3_STABLE

Modified Files:
--------------
    pgsql/src/backend/optimizer/util:
        var.c (r1.73 -> r1.73.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/var.c?r1=1.73&r2=1.73.2.1)
    pgsql/src/test/regress/expected:
        subselect.out (r1.16.2.3 -> r1.16.2.4)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/subselect.out?r1=1.16.2.3&r2=1.16.2.4)
    pgsql/src/test/regress/sql:
        subselect.sql (r1.11.2.3 -> r1.11.2.4)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/subselect.sql?r1=1.11.2.3&r2=1.11.2.4)

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