Clint Wylie ae71e05fc5
array_concat_agg and array_agg support for array inputs (#12226)
* array_concat_agg and array_agg support for array inputs
changes:
* added array_concat_agg to aggregate arrays into a single array
* added array_agg support for array inputs to make nested array
* added 'shouldAggregateNullInputs' and 'shouldCombineAggregateNullInputs' to fix a correctness issue with STRING_AGG and ARRAY_AGG when merging results, with dual purpose of being an optimization for aggregating

* fix test

* tie capabilities type to legacy mode flag about coercing arrays to strings

* oops

* better javadoc
2022-02-07 19:59:30 -08:00
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