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MDEV-9602 crash in st_key::actual_rec_per_key when group by constant

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Problem was that cost_group_min_max() could not handle if group by was optimized away.
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Monty 2016-04-27 16:37:01 +03:00
commit 48f02af761
3 changed files with 35 additions and 1 deletions
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12
sql/opt_range.cc
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@ -13105,7 +13105,17 @@ void cost_group_min_max(TABLE* table, KEY *index_info, uint used_key_parts,
num_blocks= (ha_rows)(table_records / keys_per_block) + 1;
/* Compute the number of keys in a group. */
keys_per_group= (ha_rows) index_info->actual_rec_per_key(group_key_parts - 1);
if (!group_key_parts)
{
/* Summary over the whole table */
keys_per_group= table_records;
}
else
{
keys_per_group= (ha_rows) index_info->actual_rec_per_key(group_key_parts -
1);
}
if (keys_per_group == 0) /* If there is no statistics try to guess */
/* each group contains 10% of all records */
keys_per_group= (table_records / 10) + 1;