Re: string casting for index usage

Michael Adler <adler@pobox.com> writes:
> In porting an application from v7.2 and v7.3, I noticed that a join on a varchar column and a text column was
ignoringindices that were helpful in v7.2. When I explicitly cast the text to a varchar (or set ENABLE_SEQSCAN TO
false)the index is scanned and it works as efficiently as in v7.2.  

Maybe you should be moving to 7.4, instead.

A desultory test didn't show any difference between 7.2.4 and 7.3.6
in this respect, however.  Perhaps you forgot to ANALYZE yet in the
new database?

            regards, tom lane