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We don't normally push down join quals into subqueries, because that would require creating parameterized plans. However, if the plan is already parameterized because it's LATERAL, we might as well push down any additional join quals, that refer the same relations that are already referenced within the subquery. This changes the behavior of the sublevels_up parameters to ReplaceVarsFromTargetList(). The targetlist entries used to replace vars are no longer offset by that amount. I'm not sure what the original thinking on it was, but all the existing callers passed sublevels_up = 0, so I hope this is OK. Rebase-by: reshke <reshke@double.cloud>
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