Heikki Linnakangas wrote:
> Teodor Sigaev wrote:

>> GIN speeds up '%foo%' too - which is impossible for btree. But I don't  
>> like a hack around LIKE support in BTree. This support uses outflank  
>> ways missing regular one.
> You could satisfy '%foo%' using a regular and a reverse B-tree index,  
> and a bitmap AND. Which is interestingly similar to the way you proposed  
> to use a TIDBitmap within GIN.

Huh, can you?  I can see doing "col LIKE 'foo%' OR reverse(col) LIKE
reverse('%foo')" with two btree indexes, but not a true %foo% ...

Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

Sent via pgsql-patches mailing list (pgsql-patches@postgresql.org)
To make changes to your subscription:

Reply via email to