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An outer join cannot be formed using an input path that is parameterized by a value that is supposed to be nulled by the outer join. This is obviously nonsensical, and it could lead to a bad plan being selected; although currently it seems that we'll hit various sanity-check assertions first. I think that such cases were formerly prevented by the delay_upper_joins mechanism, but now that that's gone we need an explicit check. (Perhaps we should avoid generating baserel paths that could lead to this situation in the first place; but it seems like having a defense at the join level would be a good idea anyway.) Richard Guo and Tom Lane, per report from Jaime Casanova Discussion: https://postgr.es/m/CAJKUy5g2uZRrUDZJ8p-=giwcSHVUn0c9nmdxPSY0jF0Ov8VoEA@mail.gmail.com
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