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Fixed LP bug #887479.

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The function setup_semijoin_dups_elimination erroneously assumed
that if join_cache_level is set to 3 or 4 then the type of the
access to a table cannot be JT_REF or JT_EQ_REF. This could lead
to wrong query result sets.
This commit is contained in:
Igor Babaev
2011-11-16 06:11:25 -08:00
parent 4d358f48c9
commit c05e5b9c65
3 changed files with 63 additions and 1 deletions
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2
sql/opt_subselect.cc
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@@ -3921,7 +3921,7 @@ int setup_semijoin_dups_elimination(JOIN *join, ulonglong options,
if (j != join->const_tables && js_tab->use_quick != 2 &&
j <= no_jbuf_after &&
((js_tab->type == JT_ALL && join_cache_level != 0) ||
(join_cache_level > 4 && (tab->type == JT_REF ||
(join_cache_level > 2 && (tab->type == JT_REF ||
tab->type == JT_EQ_REF))))
{
/* Looks like we'll be using join buffer */