"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> ... although to a naive user it's not clear what
> is known at vacuum time that the INSERT into the empty table
> couldn't have inferred.

The fact that the INSERT actually committed.

regards, tom lane

---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match