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This bug affected queries containing degenerated single-value subqueries with window functions. The bug led mostly to wrong results for such queries. A subquery is called degenerated if it is of the form (SELECT <expr>...). For degenerated subqueries of the form (SELECT <expr>) the transformation (SELECT <expr>) => <expr> usually is applied. However if <expr> contains set functions or window functions such rewriting is not valid for an obvious reason. The code before this patch erroneously applied the transformation when <expr> contained window functions and did not contain set functions. Approved by Rex Johnston <rex.johnston@mariadb.com>