FAQ

On Tue, Aug 6, 2013 at 6:10 PM, Greg Stark wrote:

The only other case I could come up with in my regression tests is pretty
esoteric:

CREATE COLLATION nulls (locale='C');
ALTER OPERATOR CLASS text_ops USING btree RENAME TO first;
CREATE TABLE nulls_first(t text);
CREATE INDEX nulls_first_i ON nulls_first(t COLLATE nulls first);

I'm not 100% sure there aren't other cases where this can occur though.

Blech. Well, that's why we need to stop hacking the lexer before we shoot
a hole through our foot that's too large to ignore. But it's not this
patch's job to fix that problem.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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