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(parent: 9db7d47) | patch

Replace over-optimistic Assert in partitioning code with a runtime test.

Replace over-optimistic Assert in partitioning code with a runtime test.

get_partition_parent felt that it could simply Assert that systable_getnext
found a tuple. This is unlike any other caller of that function, and it's
unsafe IMO --- in fact, the reason I noticed it was that the Assert failed.
(OK, I was working with known-inconsistent catalog contents, but I wasn't
expecting the DB to fall over quite that violently. The behavior in a
non-assert-enabled build wouldn't be very nice, either.) Fix it to do what
other callers do, namely an actual runtime-test-and-elog.

Also, standardize the wording of elog messages that are complaining about
unexpected failure of systable_getnext. 90% of them say "could not find
tuple for <object>", so make the remainder do likewise. Many of the
holdouts were using the phrasing "cache lookup failed", which is outright
misleading since no catcache search is involved.

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