Can someone confirm a suspicion for me ? I have a moderately sized table (20+ columns, 3MM rows) that tracks "tags". I have a lower(column) function index that is used simplify case-insensitive lookups. CREATE INDEX idx_tag_name_lower ON tag(lower(name)); I have a few complex queries that need to join back to this table (via the `id` primary key) and sort on `lower(name)`. I'm not selecting `lower(name)`, just using it for an order-by. The only way I seem to be able to avoid a Sequential Scan and run an index-only scan is with another index -- this one specifically (and I've run queries against 8 index permutations): CREATE INDEX idx_tag_joins ON tag(id, name_display); Am I correct in observing that the value of a function index can't be used for sorting ? -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
