解决缺陷：CTE查询中order-by子句中的字段所在的表在外层查询导致断言失败

src/common/backend/parser/parse_clause.cpp

@@ -2590,11 +2590,8 @@ bool has_not_null_constraint(ParseState* pstate,TargetEntry* tle)
         HeapTuple atttuple =
             SearchSysCacheCopy2(ATTNUM, ObjectIdGetDatum(reloid), Int16GetDatum(attno));
         if (!HeapTupleIsValid(atttuple)) {
-            Assert(0);
-            ereport(ERROR,
-                (errcode(ERRCODE_CACHE_LOOKUP_FAILED),
-                    errmsg("cache lookup failed for attribute %u of relation %hd", reloid, attno)));
-        }
+            return false;
+	}
         Form_pg_attribute attStruct = (Form_pg_attribute)GETSTRUCT(atttuple);
         bool attHasNotNull = attStruct->attnotnull;
         heap_freetuple_ext(atttuple);

src/test/regress/expected/single_node_with.out

@@ -2080,3 +2080,12 @@ WITH t AS (
 VALUES(FALSE);
 ERROR:  conditional DO INSTEAD rules are not supported for data-modifying statements in WITH
 DROP RULE y_rule ON y;
+-- the table where the field of the subquery's 'order-by' clause is located is in the outer query's 'from' clause
+CREATE TABLE table0 ( column3 INT ) ;
+WITH t1 AS ( SELECT 1 , 1 column10 ) SELECT ( SELECT 1 FROM table0 ORDER BY column10 NULLS FIRST ) FROM t1;
+ ?column? 
+----------
+         
+(1 row)
+
+drop table table0;

src/test/regress/sql/single_node_with.sql

@@ -930,3 +930,8 @@ WITH t AS (
 )
 VALUES(FALSE);
 DROP RULE y_rule ON y;
+
+-- the table where the field of the subquery's 'order-by' clause is located is in the outer query's 'from' clause
+CREATE TABLE table0 ( column3 INT ) ;
+WITH t1 AS ( SELECT 1 , 1 column10 ) SELECT ( SELECT 1 FROM table0 ORDER BY column10 NULLS FIRST ) FROM t1;
+drop table table0;