[BUGFIX]repeat return error when input length is larger than max_allow_packet

tools/deploy/mysql_test/test_suite/static_engine/r/mysql/expr_repeat.result

@@ -80,9 +80,5 @@ select repeat(1.414, 2);
 +------------------+
 
 select repeat("abc", 200000000);
-+--------------------------+
-| repeat("abc", 200000000) |
-+--------------------------+
-| NULL                     |
-+--------------------------+
+ERROR HY000: Result of repeat() was larger than max_allowed_packet (4194304) - truncated
 

tools/deploy/mysql_test/test_suite/static_engine/t/expr_repeat.test

@@ -30,6 +30,7 @@ select repeat("abc", NULL);
 select repeat(1.414, 1);
 select repeat(1.414, 2);
 
+--error 1301
 select repeat("abc", 200000000);
 
 --enable_warnings