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MDEV-8779: mysqld got signal 11 in sql/opt_range_mrr.cc:100(step_down_to)

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The crash was caused by range optimizer using RANGE_OPT_PARAM::min_key
(and max_key) to store keys. Buffer size was a good upper bound for
range analysis and partition pruning, but not for EITS selectivity
calculations.

Fixed by making these buffers variable-size. The sizes are calculated
from [pseudo]indexes used for range analysis.
This commit is contained in:
Sergei Petrunia
2015-09-20 21:31:02 +03:00
parent 139ce6cb18
commit 9b9e36ed49
4 changed files with 73 additions and 4 deletions
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4
sql/opt_range.h
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@ -643,8 +643,8 @@ public:
Used to store 'current key tuples', in both range analysis and
partitioning (list) analysis
*/
uchar min_key[MAX_KEY_LENGTH+MAX_FIELD_WIDTH],
max_key[MAX_KEY_LENGTH+MAX_FIELD_WIDTH];
uchar *min_key;
uchar *max_key;
/* Number of SEL_ARG objects allocated by SEL_ARG::clone_tree operations */
uint alloced_sel_args;