MDEV-11953: support of brackets in UNION/EXCEPT/INTERSECT operations

mysql-test/suite/funcs_1/t/row_count_func.test

@@ -14,6 +14,7 @@ INSERT INTO t1 VALUES (1), (2), (3);
 --echo
 --echo # -- Check 1.
 
+--disable_warnings
 --enable_info
 --echo SELECT * FROM t1 INTO OUTFILE "MYSQL_TMP_DIR/bug21818.txt";
 --disable_query_log # to avoid $MYSQL_TMP_DIR in query log
@@ -34,6 +35,7 @@ SELECT a FROM t1 LIMIT 1 INTO @a;
 --echo
 SELECT ROW_COUNT();
 
+--enable_warnings
 --echo
 --echo # -- Check 3.
 

mysql-test/suite/funcs_1/t/storedproc.test

@@ -18861,6 +18861,7 @@ delimiter //;
 --error ER_PARSE_ERROR
 CREATE PROCEDURE sp7()
 BEGIN
+  DECLARE count INT DEFAULT 100;
   label1: loop
     set @dummystring = 'temp value';
     if count > 10 then leave label1;