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

src/sql/engine/expr/ob_expr_repeat.cpp

@@ -147,8 +147,8 @@ int ObExprRepeat::repeat(ObString &output,
     if ((length > max_result_size / count) || (length > INT_MAX / count)) {
       LOG_WARN("Result of repeat was larger than max_allow_packet_size",
           K(ret), K(length), K(count), K(max_result_size));
-      LOG_USER_WARN(OB_ERR_FUNC_RESULT_TOO_LARGE, "repeat", static_cast<int>(max_result_size));
-      is_null = true;
+      ret = OB_ERR_FUNC_RESULT_TOO_LARGE;
+      LOG_USER_ERROR(OB_ERR_FUNC_RESULT_TOO_LARGE, "repeat", static_cast<int>(max_result_size));
     } else {
       //avoid realloc
       if (1 == count) {

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