"Regina Obe" <[EMAIL PROTECTED]> writes:
> Description:        Clustering on GIST INDEX clobbers records in table
> intermittently

> This doesn't always happen to me but does intermittently, and for others it
> happens all the time.

I wonder whether this is fixed by this recent patch:
http://archives.postgresql.org/pgsql-committers/2008-12/msg00053.php

The pre-patch behavior would've depended on the value of a
never-initialized struct field, so the erratic behavior is explained
by varying contents of memory.  I'm unable to make it happen in an
assert-enabled build, but that's probably because the initial contents
of a palloc'd chunk are never zeroes in such a build.

                        regards, tom lane

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