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Fixed the problem of mdev-6198: statistics.test fails in valgrind.

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The problem appeared when a loose scan used a key prefix whose
last component called uint3korr in the implementation of the key_cmp
virtual function.
This commit is contained in:
Igor Babaev
2014-05-02 15:47:50 -07:00
parent 32392c05b7
commit d130cef416
1 changed files with 9 additions and 3 deletions
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12
sql/opt_range.cc
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@ -13755,15 +13755,21 @@ int QUICK_GROUP_MIN_MAX_SELECT::init()
{
if (group_prefix) /* Already initialized. */
return 0;
if (!(last_prefix= (uchar*) alloc_root(&alloc, group_prefix_len)))
/*
We allocate one byte more to serve the case when the last field in
the buffer is compared using uint3korr (e.g. a Field_newdate field)
*/
if (!(last_prefix= (uchar*) alloc_root(&alloc, group_prefix_len+1)))
return 1;
/*
We may use group_prefix to store keys with all select fields, so allocate
enough space for it.
We allocate one byte more to serve the case when the last field in
the buffer is compared using uint3korr (e.g. a Field_newdate field)
*/
if (!(group_prefix= (uchar*) alloc_root(&alloc,
real_prefix_len + min_max_arg_len)))
real_prefix_len+min_max_arg_len+1)))
return 1;
if (key_infix_len > 0)