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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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1
src/backend/utils/misc/postgresql.conf.sample
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@ -206,6 +206,7 @@
#enable_hashagg = on
#enable_hashjoin = on
#enable_indexscan = on
#enable_material = on
#enable_mergejoin = on
#enable_nestloop = on
#enable_seqscan = on