Naz Gassiep <naz@mira.net> writes:
> As a result, when creating tables containing large blocks of text I wish
> to index, I've been using HASH as an index method. Please can we state
> in the manual that HASH index types are in a beta stage of development
> or something similar, or perhaps remove the manual entry altogether
> until HASH is at a point where it is usable in production.
Uh, the manual already does say
Note: Testing has shown PostgreSQL's hash indexes to perform no better than B-tree indexes, and the index size and
buildtime for hash indexes is much worse. Furthermore, hash index operations are not presently WAL-logged, so hash
indexesmight need to be rebuilt with REINDEX after a database crash. For these reasons, hash index use is presently
discouraged.
under 11.2 Index Types, as well as various derogatory remarks elsewhere.
regards, tom lane