MDEV-16708: Unsupported commands for prepared statements

Fixed test failures caused by missing output of warnings that
got on prepare phase

mysql-test/main/derived.test

@@ -475,8 +475,10 @@ CREATE TABLE t1 (a INT) ENGINE=MyISAM;
 INSERT INTO t1 VALUES (8);
 CREATE TABLE t2 (b INT) ENGINE=MyISAM;
 INSERT INTO t2 VALUES (1),(7);
+--enable_prepare_warnings
 EXPLAIN SELECT * FROM (SELECT * FROM t1) AS table1,
   (SELECT DISTINCT * FROM t2) AS table2 WHERE b = a AND a <> ANY (SELECT 9);
+--disable_prepare_warnings
 DROP TABLE t1, t2;
 set optimizer_switch=@save_derived_optimizer_switch_bug;
 

mysql-test/main/derived_cond_pushdown.test

@@ -1064,9 +1064,10 @@ DROP TABLE t1,t2;
 CREATE TABLE t1 (i INT);
 CREATE OR REPLACE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
 INSERT INTO t1 VALUES (1),(2);
-
+--enable_prepare_warnings
 EXPLAIN FORMAT=JSON
 SELECT * FROM v1 WHERE i <= ANY ( SELECT 3 );
+--disable_prepare_warnings
 
 SELECT * FROM v1 WHERE i <= ANY ( SELECT 3 );
 

mysql-test/main/having_cond_pushdown.test

@@ -73,14 +73,18 @@ GROUP BY t1.a
 HAVING (t1.a>1) OR (a IN (SELECT 3));
 eval $no_pushdown $query;
 eval $query;
+--enable_prepare_warnings
 eval explain $query;
 eval explain format=json $query;
+--disable_prepare_warnings
 let $query=
 SELECT t1.a,MAX(t1.b)
 FROM t1
 WHERE (t1.a>1) OR (a IN (SELECT 3))
 GROUP BY t1.a;
+--enable_prepare_warnings
 eval $no_pushdown explain format=json $query;
+--disable_prepare_warnings
 
 let $query=
 SELECT t1.a,MAX(t1.b),MIN(t1.c)

mysql-test/main/subselect.test

@@ -30,11 +30,15 @@ SET optimizer_switch='mrr=on,mrr_sort_keys=on,index_condition_pushdown=on';
 SET optimizer_use_condition_selectivity=4;
 
 select (select 2);
+
+--enable_prepare_warnings
 explain extended select (select 2);
 SELECT (SELECT 1) UNION SELECT (SELECT 2);
 explain extended SELECT (SELECT 1) UNION SELECT (SELECT 2);
 SELECT (SELECT (SELECT 0 UNION SELECT 0));
 explain extended SELECT (SELECT (SELECT 0 UNION SELECT 0));
+--disable_prepare_warnings
+
 -- error ER_ILLEGAL_REFERENCE
 SELECT (SELECT 1 FROM (SELECT 1) as b HAVING a=1) as a;
 -- error ER_ILLEGAL_REFERENCE
@@ -441,11 +445,15 @@ SELECT * FROM (SELECT 1) b WHERE 1 IN (SELECT *);
 CREATE TABLE t2 (id int(11) default NULL, KEY id (id)) ENGINE=MyISAM CHARSET=latin1;
 INSERT INTO t2 VALUES (1),(2);
 SELECT * FROM t2 WHERE id IN (SELECT 1);
+--enable_prepare_warnings
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1);
+--disable_prepare_warnings
 SELECT * FROM t2 WHERE id IN (SELECT 1 UNION SELECT 3);
 SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1));
+--enable_prepare_warnings
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1+(select 1));
 EXPLAIN EXTENDED SELECT * FROM t2 WHERE id IN (SELECT 1 UNION SELECT 3);
+--disable_prepare_warnings
 SELECT * FROM t2 WHERE id IN (SELECT 5 UNION SELECT 3);
 SELECT * FROM t2 WHERE id IN (SELECT 5 UNION SELECT 2);
 -- error ER_UPDATE_TABLE_USED
@@ -501,7 +509,9 @@ select 1.5 > ALL (SELECT * from t1);
 select 10.5 > ALL (SELECT * from t1);
 select 1.5 > ANY (SELECT * from t1);
 select 10.5 > ANY (SELECT * from t1);
+--enable_prepare_warnings
 explain extended select (select a+1) from t1;
+--disable_prepare_warnings
 select (select a+1) from t1;
 drop table t1;
 

mysql-test/main/subselect4.test

@@ -104,8 +104,10 @@ DROP TABLE t1,t2;
 --echo # Bug#54568: create view cause Assertion failed: 0, 
 --echo # file .\item_subselect.cc, line 836
 --echo #
+--enable_prepare_warnings
 EXPLAIN SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
 DESCRIBE SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
+--disable_prepare_warnings
 --echo # None of the below should crash
 CREATE VIEW v1 AS SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
 CREATE VIEW v2 AS SELECT 1 LIKE '%' ESCAPE ( 1 IN ( SELECT 1 ) );

mysql-test/main/table_value_constr.test

@@ -1471,7 +1471,9 @@ insert into t2 values (1), (2);
 let $q1=
 select (values ((select 2))) from t2;
 eval $q1;
+--enable_prepare_warnings
 eval explain $q1;
+--disable_prepare_warnings
 eval prepare stmt from "$q1";
 execute stmt;
 execute stmt;