Re: monitoring CREATE INDEX [CONCURRENTLY]

Hmm, looks like a very bare-bones support for hash indexes does not
require a lot of code, and gives a clear picture (you can sit all night
watching the numbers go up, instead of biting your fingernails wondering
if it'll be completed by dawn.)  This part isn't 100% done -- it we
would better to have ambuildphasename support.

(I'm a bit confused about phase 5 not reporting anything for hash
indexes in CIC, though.  That's part is supposed to be AM agnostic.)

I think it was a mistake to define the progress constants in one header
file commands/progress.h and the associated functions in pgstat.h.  I
think it would be better to move the function decls to
commands/progress.h.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
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