Fix crash when columns have been added to the end of a view.

tglsfdc · tglsfdc · commit 7e5e8b36d478 · 2017-10-27T17:10:21.000-04:00
expandRTE() supposed that an RTE_SUBQUERY subquery must have exactly as many non-junk tlist items as the RTE has column aliases for it. This was true at the time the code was written, and is still true so far as parse analysis is concerned --- but when the function is used during planning, the subquery might have appeared through insertion of a view that now has more columns than it did when the outer query was parsed. This results in a core dump if, for instance, we have to expand a whole-row Var that references the subquery. To avoid crashing, we can either stop expanding the RTE when we run out of aliases, or invent new aliases for the added columns. While the latter might be more useful, the former is consistent with what expandRTE() does for composite-returning functions in the RTE_FUNCTION case, so it seems like we'd better do it that way. Per bug #14876 from Samuel Horwitz. This has been busted since commit ff1ea21 allowed views to acquire more columns, so back-patch to all supported branches. Discussion: https://postgr.es/m/20171026184035.1471.82810@wrigleys.postgresql.org
diff --git a/src/backend/parser/parse_relation.c b/src/backend/parser/parse_relation.c
@@ -2012,9 +2012,19 @@ expandRTE(RangeTblEntry *rte, int rtindex, int sublevels_up,
 					varattno++;
 					Assert(varattno == te->resno);
 
+					/*
+					 * In scenarios where columns have been added to a view
+					 * since the outer query was originally parsed, there can
+					 * be more items in the subquery tlist than the outer
+					 * query expects.  We should ignore such extra column(s)
+					 * --- compare the behavior for composite-returning
+					 * functions, in the RTE_FUNCTION case below.
+					 */
+					if (!aliasp_item)
+						break;
+
 					if (colnames)
 					{
-						/* Assume there is one alias per target item */
 						char	   *label = strVal(lfirst(aliasp_item));
 
 						*colnames = lappend(*colnames, makeString(pstrdup(label)));
diff --git a/src/test/regress/expected/alter_table.out b/src/test/regress/expected/alter_table.out
@@ -2156,6 +2156,91 @@ Foreign-key constraints:
     "check_fk_presence_2_id_fkey" FOREIGN KEY (id) REFERENCES check_fk_presence_1(id)
 
 DROP TABLE check_fk_presence_1, check_fk_presence_2;
+-- check column addition within a view (bug #14876)
+create table at_base_table(id int, stuff text);
+insert into at_base_table values (23, 'skidoo');
+create view at_view_1 as select * from at_base_table bt;
+create view at_view_2 as select *, to_json(v1) as j from at_view_1 v1;
+\d+ at_view_1
+                View "public.at_view_1"
+ Column |  Type   | Modifiers | Storage  | Description 
+--------+---------+-----------+----------+-------------
+ id     | integer |           | plain    | 
+ stuff  | text    |           | extended | 
+View definition:
+ SELECT bt.id,
+    bt.stuff
+   FROM at_base_table bt;
+
+\d+ at_view_2
+                View "public.at_view_2"
+ Column |  Type   | Modifiers | Storage  | Description 
+--------+---------+-----------+----------+-------------
+ id     | integer |           | plain    | 
+ stuff  | text    |           | extended | 
+ j      | json    |           | extended | 
+View definition:
+ SELECT v1.id,
+    v1.stuff,
+    to_json(v1.*) AS j
+   FROM at_view_1 v1;
+
+explain (verbose, costs off) select * from at_view_2;
+                        QUERY PLAN                        
+----------------------------------------------------------
+ Seq Scan on public.at_base_table bt
+   Output: bt.id, bt.stuff, to_json(ROW(bt.id, bt.stuff))
+(2 rows)
+
+select * from at_view_2;
+ id | stuff  |             j              
+----+--------+----------------------------
+ 23 | skidoo | {"id":23,"stuff":"skidoo"}
+(1 row)
+
+create or replace view at_view_1 as select *, 2+2 as more from at_base_table bt;
+\d+ at_view_1
+                View "public.at_view_1"
+ Column |  Type   | Modifiers | Storage  | Description 
+--------+---------+-----------+----------+-------------
+ id     | integer |           | plain    | 
+ stuff  | text    |           | extended | 
+ more   | integer |           | plain    | 
+View definition:
+ SELECT bt.id,
+    bt.stuff,
+    2 + 2 AS more
+   FROM at_base_table bt;
+
+\d+ at_view_2
+                View "public.at_view_2"
+ Column |  Type   | Modifiers | Storage  | Description 
+--------+---------+-----------+----------+-------------
+ id     | integer |           | plain    | 
+ stuff  | text    |           | extended | 
+ j      | json    |           | extended | 
+View definition:
+ SELECT v1.id,
+    v1.stuff,
+    to_json(v1.*) AS j
+   FROM at_view_1 v1;
+
+explain (verbose, costs off) select * from at_view_2;
+                           QUERY PLAN                           
+----------------------------------------------------------------
+ Seq Scan on public.at_base_table bt
+   Output: bt.id, bt.stuff, to_json(ROW(bt.id, bt.stuff, NULL))
+(2 rows)
+
+select * from at_view_2;
+ id | stuff  |                   j                    
+----+--------+----------------------------------------
+ 23 | skidoo | {"id":23,"stuff":"skidoo","more":null}
+(1 row)
+
+drop view at_view_2;
+drop view at_view_1;
+drop table at_base_table;
 --
 -- lock levels
 --
diff --git a/src/test/regress/sql/alter_table.sql b/src/test/regress/sql/alter_table.sql
@@ -1402,6 +1402,26 @@ ROLLBACK;
 \d check_fk_presence_2
 DROP TABLE check_fk_presence_1, check_fk_presence_2;
 
+-- check column addition within a view (bug #14876)
+create table at_base_table(id int, stuff text);
+insert into at_base_table values (23, 'skidoo');
+create view at_view_1 as select * from at_base_table bt;
+create view at_view_2 as select *, to_json(v1) as j from at_view_1 v1;
+\d+ at_view_1
+\d+ at_view_2
+explain (verbose, costs off) select * from at_view_2;
+select * from at_view_2;
+
+create or replace view at_view_1 as select *, 2+2 as more from at_base_table bt;
+\d+ at_view_1
+\d+ at_view_2
+explain (verbose, costs off) select * from at_view_2;
+select * from at_view_2;
+
+drop view at_view_2;
+drop view at_view_1;
+drop table at_base_table;
+
 --
 -- lock levels
 --
