I've found a small bug (??) in PostgreSQL 6.5.3:
[PostgreSQL 6.5.3 on i686-pc-linux-gnu, compiled by gcc egcs-2.91.66]
SELECT SUM(1) FROM <table> WHERE <false-condition>;
I wanted to use this query to count the number of rows in a table that meet
the specified condition. Postgres crashes, if the number of rows is zero.
> table=> SELECT SUM(1) FROM nodes WHERE node_id = 172;
> pqReadData() -- backend closed the channel unexpectedly.
> This probably means the backend terminated abnormally
> before or while processing the request.
> We have lost the connection to the backend, so further processing is
> impossible. Terminating.
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