diff --git a/src/pl/parser/pl_parser_mysql_mode.y b/src/pl/parser/pl_parser_mysql_mode.y
index 0d92e677d..efc14b524 100644
--- a/src/pl/parser/pl_parser_mysql_mode.y
+++ b/src/pl/parser/pl_parser_mysql_mode.y
@@ -247,13 +247,24 @@ stmt_list:
 stmt:
   outer_stmt
   {
-    if(NULL != $1 && T_SP_DO == $1->type_) {
+    if(NULL != $1 && !parse_ctx->is_inner_parse_) {
+      switch($1->type_) {
+        // wrap nodes of following types into an anonymous block to mock SQL execution.
+        case T_SP_DO:
+        case T_SP_SIGNAL:
+        case T_SP_RESIGNAL: {
           ParseNode *proc_stmts = NULL;
           merge_nodes(proc_stmts, parse_ctx->mem_pool_, T_SP_PROC_STMT_LIST, $1);
           ParseNode *block_content = NULL;
           merge_nodes(block_content, parse_ctx->mem_pool_, T_SP_BLOCK_CONTENT, proc_stmts);
           malloc_non_terminal_node($1, parse_ctx->mem_pool_, T_SP_ANONYMOUS_BLOCK, 1, block_content);
+        } break;
+        default:{
+          // do nothing
+        } break;
+      }
     }
+
     $$ = $1;
     int32_t str_len = @1.last_column - @1.first_column + 1;
     $$->pos_ = @1.first_column;
diff --git a/src/sql/parser/ob_parser.cpp b/src/sql/parser/ob_parser.cpp
index 5385f9782..ceca17968 100644
--- a/src/sql/parser/ob_parser.cpp
+++ b/src/sql/parser/ob_parser.cpp
@@ -369,6 +369,8 @@ ObParser::State ObParser::transform_normal(ObString &normal)
   ELSIF(2, S_OF, "of")
   ELSIF(11, S_EDITIONABLE, "editionable")
   ELSIF(14, S_EDITIONABLE, "noneditionable")
+  ELSIF(6, S_SIGNAL, "signal")
+  ELSIF(8, S_RESIGNAL, "resignal")
   ELSE()
 
   if (S_INVALID == state
@@ -400,7 +402,9 @@ ObParser::State ObParser::transform_normal(
         case S_FUNCTION:
         case S_PACKAGE:
         case S_TRIGGER:
-        case S_TYPE: {
+        case S_TYPE:
+        case S_SIGNAL:
+        case S_RESIGNAL: {
           is_pl = true;
         } break;
         case S_CALL: {
diff --git a/src/sql/parser/ob_parser.h b/src/sql/parser/ob_parser.h
index afe720721..f8e88cf7e 100644
--- a/src/sql/parser/ob_parser.h
+++ b/src/sql/parser/ob_parser.h
@@ -133,6 +133,8 @@ enum State {
   S_DEFINER,
   S_OF,
   S_EDITIONABLE,
+  S_SIGNAL,
+  S_RESIGNAL,
 
   S_EXPLAIN,
   S_EXPLAIN_FORMAT,