Dmitriy Igrishin <dmit...@gmail.com> writes:
> 2012/7/24 Tom Lane <t...@sss.pgh.pa.us>
>> Please note that empty and null are not the same thing...

> Yes, I know. But why the ALTER ROLE treats '' as NULL and
> as the result all of values of pg_catalog.pg_authid.rolpassword are always
> NULL even when the password in ALTER ROLE was specified as ''? :-)

It does not do that for me.  What PG version are you testing?

                        regards, tom lane

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