Hi,
I have narrowed it a bit. It happens when I create said index on an empty field. Here's the scenario to reproduce it:
Let me know if you need more info
Cheers
Raph
create table events(id SERIAL,
timestamp timestamp,
event json);
create table events_2012_01( CHECK (timestamp>='2012-01-01' and timestamp<'2012-2-01' )) inherits (events) ;
create table events_2012_02( CHECK (timestamp>='2012-02-01' and timestamp<'2012-3-01' )) inherits (events) ;
insert into events_2012_01 (timestamp, event) values ('2012-01-22 08:38:56', '{"_id":"4f93c3a044650105b5074c9a","type":"t1"}');
insert into events_2012_02 (timestamp, event) values ('2012-02-22 08:38:56', '{"_id":"5f93c3a044650105b5074c9a","type":"t2"}');
-- create empty table
create table events_2012_03( CHECK (timestamp>='2012-03-01' and timestamp<'2012-4-01' )) inherits (events) ;
explain select max(event->>'_id') from events where event is not null;
--OK
--create index
create index events_2012_03_event_id_index on events_2012_03 ((event->>'_id'));
explain select max(event->>'_id') from events where event is not null;
--BANG
drop index events_2012_03_event_id_index;
explain select max(event->>'_id') from events where event is not null;
--OK
