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Add an 'enable_material' GUC.

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The logic for determining whether to materialize has been significantly
overhauled for 9.0.  In case there should be any doubt about whether
materialization is a win in any particular case, this should provide a
convenient way of seeing what happens without it; but even with enable_material
turned off, we still materialize in cases where it is required for
correctness.

Thanks to Tom Lane for the review.
This commit is contained in:
Robert Haas
2010-04-19 00:55:26 +00:00
parent 9287567eff
commit 5b89ef384c
8 changed files with 57 additions and 15 deletions
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3
src/include/optimizer/cost.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.100 2010/01/02 16:58:07 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.101 2010/04/19 00:55:26 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@@ -57,6 +57,7 @@ extern bool enable_tidscan;
extern bool enable_sort;
extern bool enable_hashagg;
extern bool enable_nestloop;
extern bool enable_material;
extern bool enable_mergejoin;
extern bool enable_hashjoin;
extern int constraint_exclusion;