Himanshu 5c3db41c2b
string column handling for long/float min/max/sum aggregators (#8319)
* string column handling for long min/max/sum aggregators

* add apache license to new files

* use 'L' as suffix for long literal instead of 'l'

* return null in ParallelCombiner.SettableColumnSelectorFactory.getColumnCapabilities(String) as is required by contract of ColumnSelectorFactory interface

* fix more tests
2019-08-27 16:10:59 -07:00
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