On 2016/10/11 15:58, Amit Langote wrote: > If I create btree index on a int2vector column, it does not get used for > queries because the query search always fails to match the index operator > (family). > > During index creation, GetDefaultOpClass() returns array_ops for a > int2vector index column, because type int2vector is binary-coercible with > anyarray (which is array_ops's input type). Whereas queries involving > int2vector columns would use a int2vector_ops operator.
I was wrong that the index *never* gets used. It does in fact get used if the operator is an ordering search operator (<, <=, >, >=), in which case the query would use an array_ops operator (which is a btree operator class for type anyarray) and hence matches the index operator family. I failed to mention in my original message that int2vector_ops is a hash operator class. There is exactly one =(int2vector, int2vector) operator in the system of which there is no btree equivalent. I guess there is not much to complaint about here after all. Sorry about the noise. Thanks, Amit -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers