Alessandro Baretta <[EMAIL PROTECTED]> writes:
> I have no clue as to how or why the statistics were wrong
> yesterday--as I vacuum-analyzed continuously out of lack of any better
> idea--and I was stupid enough to re-timestamp everything before
> selecting from pg_stats.

Too bad.  I would be interested to find out how, if the stats were
up-to-date, the thing was still getting the row estimate so wrong.
If you manage to get the database back into its prior state please
do send along the pg_stats info.

                        regards, tom lane

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