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MDEV-22728: SIGFPE in Unique::get_cost_calc_buff_size from prepare_search_best_index_intersect on optimized builds

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For low sort_buffer_size, in the cost calculation of using the Unique object the elements in the tree were evaluated to 0, make sure to have atleast 1 element in the Unique tree.

Also for the function Unique::get allocate memory for atleast MERGEBUFF2+1 keys.
This commit is contained in:
Varun Gupta
2020-06-05 13:11:33 +05:30
parent f30ff10c8d
commit d218d1aa49
4 changed files with 70 additions and 1 deletions
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3
sql/sql_class.h
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@ -5216,6 +5216,9 @@ public:
{
ulonglong max_elems_in_tree=
max_in_memory_size / ALIGN_SIZE(sizeof(TREE_ELEMENT)+key_size);
if (max_elems_in_tree == 0)
max_elems_in_tree= 1;
return (int) (sizeof(uint)*(1 + nkeys/max_elems_in_tree));
}