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Fix EquivalenceClass code to handle volatile sort expressions in a more

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predictable manner; in particular that if you say ORDER BY output-column-ref,
it will in fact sort by that specific column even if there are multiple
syntactic matches.  An example is
	SELECT random() AS a, random() AS b FROM ... ORDER BY b, a;
While the use-case for this might be a bit debatable, it worked as expected
in earlier releases, so we should preserve the behavior for 8.3.  Per my
recent proposal.

While at it, fix convert_subquery_pathkeys() to handle RelabelType stripping
in both directions; it needs this for the same reasons make_sort_from_pathkeys
does.
This commit is contained in:
Tom Lane
2007-11-08 21:49:48 +00:00
parent 1be0601681
commit c291203ca3
8 changed files with 304 additions and 187 deletions
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3
src/backend/nodes/outfuncs.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.315 2007/10/11 18:05:27 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.316 2007/11/08 21:49:47 tgl Exp $
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
@@ -1405,6 +1405,7 @@ _outEquivalenceClass(StringInfo str, EquivalenceClass *node)
WRITE_BOOL_FIELD(ec_has_volatile);
WRITE_BOOL_FIELD(ec_below_outer_join);
WRITE_BOOL_FIELD(ec_broken);
WRITE_UINT_FIELD(ec_sortref);
}
static void