Tom Lane bdfbfde1b1 IN clauses appearing at top level of WHERE can now be handled as joins. ...

There are two implementation techniques: the executor understands a new
JOIN_IN jointype, which emits at most one matching row per left-hand row,
or the result of the IN's sub-select can be fed through a DISTINCT filter
and then joined as an ordinary relation.
Along the way, some minor code cleanup in the optimizer; notably, break
out most of the jointree-rearrangement preprocessing in planner.c and
put it in a new file prep/prepjointree.c.

2003-01-20 18:55:07 +00:00

29 KiB

Raw Blame History

View Raw