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583b39811c
in _ma_unique_hash, skip_trailing_space, my_hash_sort_mb_nopad_bin and my_strnncollsp_utf8mb4_bin UBSAN detected the nullptr-with-offset in a few places when handling empty blobs. Fix: - Adding DBUG_ASSERT(source_string) into all hash_sort() implementations to catch this problem in non-UBSAN debug builds. - Fixing mi_unique_hash(), mi_unique_comp(), _ma_unique_hash(), _ma_unique_comp() to replace NULL pointer to an empty string ponter.. Note, we should also add DBUG_ASSERT(source_string != NULL) into all implementations of strnncoll*(). But I'm afraid the patch is going to be too long and too dangerous for 10.5.