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d2db80c8d4
Valgrind warning happpens because of uninitialized null bytes. In row_sel_push_cache_row_for_mysql() function we fill fetch cache with necessary field values, row_sel_store_mysql_rec() is called for this and leaves null bytes untouched. Later row_sel_pop_cached_row_for_mysql() rewrites table record buffer with uninited null bytes. We can see the problem from the test case: At 'SELECT...' we call row_sel_push...->row_sel_store...->row_sel_pop_cached... chain which rewrites table->record[0] buffer with uninitialized null bytes. When we call 'UPDATE...' statement, compare_record uses this buffer and valgrind warning occurs. The fix is to init null bytes with default values.