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Ported the fix for bug #57024 (a performance issue for outer joins).

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Employed the same kind of optimization as in the fix for the cases
when join buffer is used.
The optimization performs early evaluation of the conditions from 
on expression with table references to only outer tables of
an outer join.
This commit is contained in:
Igor Babaev
2010-10-06 13:27:12 -07:00
parent f1d42ec940
commit 79087c9e07
8 changed files with 420 additions and 88 deletions
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sql/multi_range_read.cc
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@ -223,7 +223,7 @@ handler::multi_range_read_init(RANGE_SEQ_IF *seq_funcs, void *seq_init_param,
int handler::multi_range_read_next(char **range_info)
{
int UNINIT_VAR(result);
int result= HA_ERR_END_OF_FILE;
int range_res;
DBUG_ENTER("handler::multi_range_read_next");