Alter table drop column and background vacuum?

During the discussion of bools and hash index and partial indexes and
index growth and everything else, I tried to make a partial index on a
bool field and got the error that "data type bool has no default operator
for class hash..."

So, can I cast something to make this work, or is it possible to make
hash indexes work with bools. There are a few instances where a small
percentage of a table is marked false while the rest is true, or vice
versa, where a partial hash index would be nice to try, and may not have
the ever expanding index problem that brtees have.

--
"Force has no place where there is need of skill.", "Haste in every
business brings failures.", "This is the bitterest pain among men, to have
much knowledge but no power." -- Herodotus

Scott Marlowe <scott.marlowe@ihs.com> writes:

During the discussion of bools and hash index and partial indexes and
index growth and everything else, I tried to make a partial index on a
bool field and got the error that "data type bool has no default operator
for class hash..."

Well, no. I can't see much point in hashing for a datatype with only
two values. (Of course, btree probably sucks too in this case.)

You could probably gin one up pretty quickly using the support routines
for char_ops, if you want one for testing.

regards, tom lane