Tomasz Ostrowski <[email protected]> writes:
> I've noticed that hash indexes can't currently (in PG10) be multicolumn.
> Are they technically hard to implement or just nobody took such a feature?
It's not simple, particularly not if you wish that the index would support
queries specifying conditions for just a subset of the indexed columns
(an assumption that's buried pretty deeply in the planner, for one thing).
Then you couldn't compute the hash.
regards, tom lane
--
Sent via pgsql-hackers mailing list ([email protected])
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
