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Enable windowed aggregates and fix correctness issues #4007

@andygrove

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@andygrove

What is the problem the feature request solves?

Windowed aggregates are disabled by default. This hurts performance in TPC-DS.

I had an earlier PR to start addressing this but it could closed due to becoming stale: #3397

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area:aggregationHash aggregates, aggregate expressionscorrectnessenhancementNew feature or requestexpressionSpark expression relatedpriority:mediumFunctional bugs, performance regressions, broken features

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