On Mon, May 15, 2017 at 6:57 AM, amul sul <sula...@gmail.com> wrote:
>> Collation is only relevant for ordering, not equality.  Since hash
>> opclasses provide only equality, not ordering, it's not relevant here.
>> I'm not sure whether we should error out if it's specified or just
>> silently ignore it.  Maybe an ERROR is a good idea?  But not sure.
> IMHO, we could simply have a WARNING, and ignore collation, thoughts?
> Updated patches attached.

I think that WARNING is rarely a good compromise between ERROR and
nothing.  I think we should just decide whether this is legal (and
then allow it without a WARNING) or not legal (and then ERROR).
Telling the user that it's allowed but we don't like it doesn't really
help much.

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

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