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Fixed LP bug #925985.

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If the flag 'optimize_join_buffer_size' is set to 'off' and the value
of the system variable 'join_buffer_size' is greater than the value of
the system variable 'join_buffer_space_limit' than no join cache can
be employed to join tables of the executed query.
A bug in the function JOIN_CACHE::alloc_buffer allowed to use join
buffer even in this case while another bug in the function 
revise_cache_usage could cause a crash of the server in this case if the
chosen execution plan for the query contained outer join or semi-join
operation.
This commit is contained in:
Igor Babaev
2012-02-13 23:46:57 -08:00
parent 27dfa45e70
commit c8bbe06ac7
4 changed files with 74 additions and 2 deletions
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2
sql/sql_join_cache.cc
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@ -898,6 +898,8 @@ int JOIN_CACHE::alloc_buffer()
curr_buff_space_sz+= cache->get_join_buffer_size();
}
}
curr_min_buff_space_sz+= min_buff_size;
curr_buff_space_sz+= buff_size;
if (curr_min_buff_space_sz > join_buff_space_limit ||
(curr_buff_space_sz > join_buff_space_limit &&