Clint Wylie 741b4ed516
add output type information to ExpressionPostAggregator (#11818)
* add ColumnInspector argument to PostAggregator.getType to allow post-aggs to compute their output type based on input types

* add test for test for coverage

* simplify

* Remove unused imports.

Co-authored-by: Gian Merlino <gian@imply.io>
2021-10-22 13:52:51 -07:00
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