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forever, cannot be killed Virtual_column_info::fix_and_check_expr() first does fix_expr() which finds all fields in query tables and then check_vcol_func_processor() which prohibits SELECT expression. So before we get the error prohibiting SELECT in vcol expression we must satisfy fix_expr() with all the opened tables. The patch achieves this by iterating query_tables from parsed vcol expression and by assigning opened tables from the main parser context (as they are already preopened if the parser sees some SELECT expressions). But the problem is, we cannot use these TABLE objects fully for vcol expression, at least the comment about MERGE tables states so: /* MERGE tables need to access parent and child TABLE_LISTs. */ DBUG_ASSERT(tables->table->pos_in_table_list == tables); Therefore after we have done vcol check we should revert back TABLE_LISTs to the original TABLE-less state. As CREATE OR REPLACE first drops the original table (at least prior to MDEV-25292) we can use the above hack from the currently opening table. And that is possible only after bitmaps initialized, so we move their execution to a little earlier stage, before vcol parsing. But partitioning depends on uninitialized bitmaps, so we temporarily revert some to make partitioning initialization happy. Note that plain CREATE TABLE just fails this case in parser with NO_SUCH_TABLE, CREATE OR REPLACE doesn't fail in parser as the old table still exists. Now to the hang, mysql_rm_table_no_locks() does TDC_RT_REMOVE_ALL which waits while share is closed. The table normally is open only as OPEN_STUB, this is what parser does for CREATE TABLE. But for SELECT the table is opened not as a stub. If it is the same table name we anyway have two TABLE_LIST objects: stub and not stub. So for "not stub" TDC_RT_REMOVE_ALL sees open count and decides to wait until it is closed. And of course it hangs, because that was opened in the same thread. Now we force close such TABLE objects before mysql_rm_table_no_locks(). And the third, condition for sequences was wrong: we have to check TABLE_LIST::sequence property to make sure we processing sequence. |
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