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Commit461f479

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Correctly check updatability of columns targeted by INSERT...DEFAULT.
If a view has some updatable and some non-updatable columns, we failedto verify updatability of any columns for which an INSERT or UPDATEon the view explicitly specifies a DEFAULT item (unless the view hasa declared default for that column, which is rare anyway, and onewould almost certainly not write one for a non-updatable column).This would lead to an unexpected "attribute number N not found inview targetlist" error rather than the intended error.Per bug #18546 from Alexander Lakhin. This bug is old, so back-patchto all supported branches.Discussion:https://postgr.es/m/18546-84a292e759a9361d@postgresql.org
1 parentc5321e9 commit461f479

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3 files changed

+23
-10
lines changed

3 files changed

+23
-10
lines changed

‎src/backend/rewrite/rewriteHandler.c

Lines changed: 19 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -2914,7 +2914,7 @@ relation_is_updatable(Oid reloid,
29142914
*
29152915
* This is used with simply-updatable views to map column-permissions sets for
29162916
* the view columns onto the matching columns in the underlying base relation.
2917-
*The targetlist is expected to be a list of plain Vars of the underlying
2917+
*Relevant entries in the targetlist must be plain Vars of the underlying
29182918
* relation (as per the checks above in view_query_is_auto_updatable).
29192919
*/
29202920
staticBitmapset*
@@ -3011,6 +3011,9 @@ rewriteTargetView(Query *parsetree, Relation view)
30113011
*/
30123012
viewquery=copyObject(get_view_query(view));
30133013

3014+
/* Locate RTE describing the view in the outer query */
3015+
view_rte=rt_fetch(parsetree->resultRelation,parsetree->rtable);
3016+
30143017
/* The view must be updatable, else fail */
30153018
auto_update_detail=
30163019
view_query_is_auto_updatable(viewquery,
@@ -3053,17 +3056,26 @@ rewriteTargetView(Query *parsetree, Relation view)
30533056
}
30543057

30553058
/*
3056-
* For INSERT/UPDATE the modified columns must all be updatable. Note that
3057-
* we get the modified columns from the query's targetlist, not from the
3058-
* result RTE's insertedCols and/or updatedCols set, since
3059-
* rewriteTargetListIU may have added additional targetlist entries for
3060-
* view defaults, and these must also be updatable.
3059+
* For INSERT/UPDATE the modified columns must all be updatable.
30613060
*/
30623061
if (parsetree->commandType!=CMD_DELETE)
30633062
{
3064-
Bitmapset*modified_cols=NULL;
3063+
Bitmapset*modified_cols;
30653064
char*non_updatable_col;
30663065

3066+
/*
3067+
* Compute the set of modified columns as those listed in the result
3068+
* RTE's insertedCols and/or updatedCols sets plus those that are
3069+
* targets of the query's targetlist(s). We must consider the query's
3070+
* targetlist because rewriteTargetListIU may have added additional
3071+
* targetlist entries for view defaults, and these must also be
3072+
* updatable. But rewriteTargetListIU can also remove entries if they
3073+
* are DEFAULT markers and the column's default is NULL, so
3074+
* considering only the targetlist would also be wrong.
3075+
*/
3076+
modified_cols=bms_union(view_rte->insertedCols,
3077+
view_rte->updatedCols);
3078+
30673079
foreach(lc,parsetree->targetList)
30683080
{
30693081
TargetEntry*tle= (TargetEntry*)lfirst(lc);
@@ -3121,9 +3133,6 @@ rewriteTargetView(Query *parsetree, Relation view)
31213133
}
31223134
}
31233135

3124-
/* Locate RTE describing the view in the outer query */
3125-
view_rte=rt_fetch(parsetree->resultRelation,parsetree->rtable);
3126-
31273136
/*
31283137
* If we get here, view_query_is_auto_updatable() has verified that the
31293138
* view contains a single base relation.

‎src/test/regress/expected/updatable_views.out

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1361,6 +1361,9 @@ DETAIL: View columns that refer to system columns are not updatable.
13611361
INSERT INTO rw_view1 (s, c, a) VALUES (null, null, 1.1); -- should fail
13621362
ERROR: cannot insert into column "s" of view "rw_view1"
13631363
DETAIL: View columns that are not columns of their base relation are not updatable.
1364+
INSERT INTO rw_view1 (s, c, a) VALUES (default, default, 1.1); -- should fail
1365+
ERROR: cannot insert into column "s" of view "rw_view1"
1366+
DETAIL: View columns that are not columns of their base relation are not updatable.
13641367
INSERT INTO rw_view1 (a) VALUES (1.1) RETURNING a, s, c; -- OK
13651368
a | s | c
13661369
-----+-------------------+-------------------

‎src/test/regress/sql/updatable_views.sql

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -665,6 +665,7 @@ CREATE VIEW rw_view1 AS
665665

666666
INSERT INTO rw_view1VALUES (null,null,1.1,null);-- should fail
667667
INSERT INTO rw_view1 (s, c, a)VALUES (null,null,1.1);-- should fail
668+
INSERT INTO rw_view1 (s, c, a)VALUES (default, default,1.1);-- should fail
668669
INSERT INTO rw_view1 (a)VALUES (1.1) RETURNING a, s, c;-- OK
669670
UPDATE rw_view1SET s= sWHERE a=1.1;-- should fail
670671
UPDATE rw_view1SET a=1.05WHERE a=1.1 RETURNING s;-- OK

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