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authorigor@rurik.mysql.com <>2006-10-31 17:31:56 -0800
committerigor@rurik.mysql.com <>2006-10-31 17:31:56 -0800
commit2a7acba7e10197ec4a651ae828ff51c0a2ff4747 (patch)
treeb8cf0e80a37eba77a6cccf9e41a8871266533675 /sql/field.cc
parent17eb0b353e5a112e1d0005b71190c1e3278e0583 (diff)
downloadmariadb-git-2a7acba7e10197ec4a651ae828ff51c0a2ff4747.tar.gz
Fixed bug #21727.
This is a performance issue for queries with subqueries evaluation of which requires filesort. Allocation of memory for the sort buffer at each evaluation of a subquery may take a significant amount of time if the buffer is rather big. With the fix we allocate the buffer at the first evaluation of the subquery and reuse it at each subsequent evaluation.
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