EXPLAIN with view: bogus varno: 5

Running EXPLAIN on a view that has an aggregate and uses an index
results in the error "bogus varno: 5".  At least I think the aggregate
and index are necessary -- removing either from the following example
allows EXPLAIN to succeed:

test=> CREATE TABLE foo (x integer);
CREATE TABLE
test=> CREATE INDEX foo_x_idx ON foo (x);
CREATE INDEX
test=> CREATE VIEW fooview1 AS SELECT count(*) FROM foo WHERE x < 10;
CREATE VIEW
test=> CREATE VIEW fooview2 AS SELECT * FROM foo WHERE x < 10;
CREATE VIEW
test=> CREATE VIEW fooview3 AS SELECT count(*) FROM foo;
CREATE VIEW
test=> CREATE VIEW fooview4 AS SELECT * FROM foo;
CREATE VIEW

test=> \set VERBOSITY verbose

test=> EXPLAIN SELECT * FROM fooview1;
ERROR:  XX000: bogus varno: 5
LOCATION:  get_rte_for_var, ruleutils.c:2478

test=> EXPLAIN SELECT * FROM fooview2;                               QUERY PLAN                                
--------------------------------------------------------------------------Bitmap Heap Scan on foo  (cost=3.50..22.41
rows=713width=4)  Recheck Cond: (x < 10)  ->  Bitmap Index Scan on foo_x_idx  (cost=0.00..3.50 rows=713 width=0)
IndexCond: (x < 10)
 
(4 rows)

test=> EXPLAIN SELECT * FROM fooview3;                        QUERY PLAN                          
-------------------------------------------------------------Aggregate  (cost=36.75..36.75 rows=1 width=0)  ->  Seq
Scanon foo  (cost=0.00..31.40 rows=2140 width=0)
 
(2 rows)

test=> EXPLAIN SELECT * FROM fooview4;                     QUERY PLAN                       
-------------------------------------------------------Seq Scan on foo  (cost=0.00..31.40 rows=2140 width=4)
(1 row)

test=> DROP INDEX foo_x_idx;
DROP INDEX
test=> EXPLAIN SELECT * FROM fooview1;                        QUERY PLAN                         
------------------------------------------------------------Aggregate  (cost=38.53..38.53 rows=1 width=0)  ->  Seq Scan
onfoo  (cost=0.00..36.75 rows=713 width=0)        Filter: (x < 10)
 
(3 rows)

-- 
Michael Fuhr