WEB-11368: Skip literals so that HiveUDAF percentile_approx can operate correctly #186
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Note, this DOES fail a couple of tests, and I'm not 100% sure I'm rewriting correctly (although I don't see how my changes to the Rewriter cause failures in tests that should not be subject to rewrite because there's only one distinct....) |
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FWIW, the two tests that fail with this change also fail without it..... |
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backporting apache/spark/apache#15668 leads to a much better place -- the resulting query loses the unnecessary columns for the aggregate children (arguments) which were literals, because that code extracts the literals earlier. |
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@markhamstra don't know if it's worth pursuing this -- depends on if spark2.1 is ready to go soon and if this is a bug that customers have run into.
Also, should run tests and make sure I haven't broken anything, but it does at least pass a (new) test I added to sparky for this issue.