Re: [HACKERS] WIP: Aggregation push-down

On 01/29/18 03:32, Antonin Houska wrote:
> Robert Haas <robertmhaas@gmail.com> wrote:

>>> only take place if we had a special equality operator which distinguishes the
>>> *binary* values (I don't know yet how to store this operator the catalog ---
...
>> We don't have an operator that tests for binary equality, but it's
>> certainly testable from C; see datumIsEqual.

Disclaimer: I haven't been following the whole thread closely. But could
there be some way to exploit the composite-type *= operator?

https://www.postgresql.org/docs/current/static/functions-comparisons.html#COMPOSITE-TYPE-COMPARISON

-Chap