EXPLAIN with view: bogus varno: 5

I'm not sure it's relevant to Michaels' case, but I see message (8.1dev)

ERROR: bogus varno: 2

tp=# explain select name_qualified from place, to_tsquery('moscow') as query
where fts_index @@ query;
ERROR: bogus varno: 2

In my case, this select produces core dump while being rewritten works fine.

tp=# select name_qualified from place
where fts_index @@ to_tsquery('moscow');

Oleg

On Fri, 26 Aug 2005, Michael Fuhr wrote:

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=713 width=4)
Recheck Cond: (x < 10)
-> Bitmap Index Scan on foo_x_idx (cost=0.00..3.50 rows=713 width=0)
Index Cond: (x < 10)
(4 rows)

test=> EXPLAIN SELECT * FROM fooview3;
QUERY PLAN
-------------------------------------------------------------
Aggregate (cost=36.75..36.75 rows=1 width=0)
-> Seq Scan on 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 on foo (cost=0.00..36.75 rows=713 width=0)
Filter: (x < 10)
(3 rows)

Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83

Michael Fuhr <mike@fuhr.org> writes:

Running EXPLAIN on a view that has an aggregate and uses an index
results in the error "bogus varno: 5".

I've committed a fix for this --- it was a bug in the recently added
code that eliminates useless SubqueryScan nodes.

regards, tom lane