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Fixed LP bug #889750.

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If the optimizer switch 'semijoin_with_cache' is set to 'off' then 
join cache cannot be used to join inner tables of a semijoin.

Also fixed a bug in the function check_join_cache_usage() that led
to wrong output of the EXPLAIN commands for some test cases.
This commit is contained in:
Igor Babaev
2011-11-15 13:03:00 -08:00
parent db0aed9348
commit b4b7d941fe
30 changed files with 183 additions and 52 deletions
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5
sql/sql_select.cc
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@ -9025,7 +9025,7 @@ uint check_join_cache_usage(JOIN_TAB *tab,
if (tab->inside_loosescan_range)
goto no_join_cache;
if (tab->is_inner_table_of_semi_join_with_first_match() &&
if (tab->is_inner_table_of_semijoin() &&
!join->allowed_semijoin_with_cache)
goto no_join_cache;
if (tab->is_inner_table_of_outer_join() &&
@ -9172,7 +9172,10 @@ uint check_join_cache_usage(JOIN_TAB *tab,
no_join_cache:
if (tab->type != JT_ALL && tab->is_ref_for_hash_join())
{
tab->type= JT_ALL;
tab->ref.key_parts= 0;
}
revise_cache_usage(tab);
return 0;
}