!1597 修复startwitch下cte和subquery嵌套的问题

Merge pull request !1597 from 杨皓/master

src/common/backend/parser/parse_startwith.cpp

@@ -331,6 +331,11 @@ void AddStartWithTargetRelInfo(ParseState* pstate, Node* relNode,
             startInfo->aliasname = sub->alias->aliasname;
         }
 
+        SelectStmt *substmt = (SelectStmt*)sub->subquery;
+        if (substmt->withClause == NULL) {
+            substmt->withClause = (WithClause*)copyObject(pstate->origin_with);
+        }
+
         startInfo->rte = rte;
         startInfo->rtr = rtr;
         startInfo->rtekind = rte->rtekind;

src/test/regress/expected/sw_bugfix-2.out

@@ -1415,3 +1415,13 @@ LIMIT 169;
 ----
 (0 rows)
 
+create table t123(id int, lid int, name text);
+insert into t123 values(1,null,'A'),(2,1,'B'),(3,2,'C');
+with t2 as (select * from t123 where id!=10) select level,t.* from (select * from t2 where id!=10 order by id) t start with t.id=2 connect by prior t.id=t.lid;
+ level | id | lid | name 
+-------+----+-----+------
+     1 |  2 |   1 | B
+     2 |  3 |   2 | C
+(2 rows)
+
+drop table t123;

src/test/regress/sql/sw_bugfix-2.sql

@@ -501,3 +501,8 @@ WHERE true CONNECT BY EXISTS (
     test_hcb_ptb as ref_7
 ) 
 LIMIT 169;
+
+create table t123(id int, lid int, name text);
+insert into t123 values(1,null,'A'),(2,1,'B'),(3,2,'C');
+with t2 as (select * from t123 where id!=10) select level,t.* from (select * from t2 where id!=10 order by id) t start with t.id=2 connect by prior t.id=t.lid;
+drop table t123;