Fixes for Bug #38016 Maria: trying to access freed memory when committing a transaction
Don't write out states if they haven't changed sql/sql_base.cc: Call extra(HA_EXTRA_PREPARE_FOR_DROP) before doing a drop of a table More DBUG sql/sql_table.cc: Call extra(HA_EXTRA_PREPARE_FOR_RENAME) before renaming a table storage/maria/ha_maria.cc: Ensure that file->trn is set when we call extra(HA_EXTRA_PREPARE_FOR_DROP/RENAME) storage/maria/ma_close.c: When doing close, assert if we have pointers in trn->table_list that points to the MARIA_SHARE storage/maria/ma_extra.c: Reset info->state_start in case of drop/rename. This fixes the problem of accessing freed memory in repair Don't write state changed if they haven't changed storage/maria/ma_open.c: Reset share->changed after we have written out a state (speed optimization to not write states when they haven't changed) storage/maria/ma_state.c: Decrement share->in_trans properly in DBUG_BINARY to ensure that the DBUG_ASSERT() in maria_close() works More DBUG
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