fix: parsing conflicts

source/libs/parser/inc/sql.y

@@ -952,10 +952,10 @@ union_query_expression(A) ::=
   query_simple_or_subquery(B) UNION query_simple_or_subquery(C).                  { A = createSetOperator(pCxt, SET_OP_TYPE_UNION, B, C); }
 
 query_simple_or_subquery(A) ::= query_simple(B).                                  { A = B; }
-query_simple_or_subquery(A) ::= subquery(B).                                      { A = B; }
+query_simple_or_subquery(A) ::= subquery(B).                                      { A = releaseRawExprNode(pCxt, B); }
 
 query_or_subquery(A) ::= query_expression(B).                                     { A = B; }
-query_or_subquery(A) ::= subquery(B).                                             { A = B; }
+query_or_subquery(A) ::= subquery(B).                                             { A = releaseRawExprNode(pCxt, B); }
 
 %type order_by_clause_opt                                                         { SNodeList* }
 %destructor order_by_clause_opt                                                   { nodesDestroyList($$); }

source/libs/parser/src/sql.c

@@ -4369,9 +4369,7 @@ static YYACTIONTYPE yy_reduce(
       case 470: /* query_simple ::= query_specification */ yytestcase(yyruleno==470);
       case 471: /* query_simple ::= union_query_expression */ yytestcase(yyruleno==471);
       case 474: /* query_simple_or_subquery ::= query_simple */ yytestcase(yyruleno==474);
-      case 475: /* query_simple_or_subquery ::= subquery */ yytestcase(yyruleno==475);
       case 476: /* query_or_subquery ::= query_expression */ yytestcase(yyruleno==476);
-      case 477: /* query_or_subquery ::= subquery */ yytestcase(yyruleno==477);
 { yylhsminor.yy776 = yymsp[0].minor.yy776; }
   yymsp[0].minor.yy776 = yylhsminor.yy776;
         break;
@@ -4432,6 +4430,8 @@ static YYACTIONTYPE yy_reduce(
       case 315: /* signed_literal ::= literal_func */ yytestcase(yyruleno==315);
       case 381: /* star_func_para ::= expression */ yytestcase(yyruleno==381);
       case 436: /* select_item ::= common_expression */ yytestcase(yyruleno==436);
+      case 475: /* query_simple_or_subquery ::= subquery */ yytestcase(yyruleno==475);
+      case 477: /* query_or_subquery ::= subquery */ yytestcase(yyruleno==477);
       case 489: /* search_condition ::= common_expression */ yytestcase(yyruleno==489);
 { yylhsminor.yy776 = releaseRawExprNode(pCxt, yymsp[0].minor.yy776); }
   yymsp[0].minor.yy776 = yylhsminor.yy776;

source/libs/planner/test/planSetOpTest.cpp

@@ -44,6 +44,8 @@ TEST_F(PlanSetOpTest, unionAllWithSubquery) {
   run("SELECT ts FROM (SELECT ts FROM st1s1) UNION ALL SELECT ts FROM (SELECT ts FROM st1s2)");
   // super table
   run("SELECT ts FROM (SELECT ts FROM st1) UNION ALL SELECT ts FROM (SELECT ts FROM st1)");
+
+  run("(SELECT SERVER_STATUS()) UNION ALL (SELECT SERVER_STATUS())");
 }
 
 TEST_F(PlanSetOpTest, unionAllWithOrderBy) {

tests/script/tsim/parser/union.sim

@@ -116,7 +116,7 @@ sql_error (select c1 from union_tb0 limit 1 union all select c1 from union_tb1 l
 sql_error (select c1 from union_tb0 limit 1 union all select c1 from union_tb1 limit 1) limit 1
 
 # sql with parenthese
-sql (((select c1 from union_tb0)))
+sql (select c1 from union_tb0)
 if $rows != 10000 then
   return -1
 endi