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Fixed bug mdev-6292.

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Avoided exponential recursive calls of JOIN_CACHE::join_records() in the case
of non-nested outer joins.
A different solution is required to resolve this performance problem for
nested outer joins.
This commit is contained in:
Igor Babaev
2014-09-09 16:44:54 -07:00
parent 20fff8e5bd
commit 5023bb899d
5 changed files with 283 additions and 5 deletions
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2
sql/sql_join_cache.cc
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@ -2087,7 +2087,7 @@ enum_nested_loop_state JOIN_CACHE::join_records(bool skip_last)
goto finish;
if (outer_join_first_inner)
{
if (next_cache)
if (next_cache && join_tab != join_tab->last_inner)
{
/*
Ensure that all matches for outer records from join buffer are to be