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Fix some nasty coredump bugs in hashjoin. This code was just
about certain to fail anytime it decided the relation to be hashed wastoo big to fit in memory --- the code for 'batching' a series of hashjoinshad multiple errors. I've fixed the easier problems. A remaining bigproblem is that you can get 'hashtable out of memory' if the code'sguesstimate about how much overflow space it will need turns out wrong.That will require much more extensive revisions to fix, so I'm committingthese fixes now before I start on that problem.1 parent5d5cf91 commit9f82f9e
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