Re: found xmin from before relfrozenxid on pg_catalog.pg_authid

I added an Assert(DatabasePath != NULL) to
RelationCacheInitFilePreInvalidate() and didn't see a single crash when
running the tests.  I thought that adding a "VACUUM FREEZE pg_class"
in the recovery tests (where there is a standby) ought to do it, but it
doesn't.  What's the deal there?

Here are some proposed changes.  Some of these comment edits are WIP :-)

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Álvaro Herrera                https://www.2ndQuadrant.com/
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