Jihoon Son a459db68b6 Fine grained buffer management for groupby (#3863)
* Fine-grained buffer management for group by queries

* Remove maxQueryCount from GroupByRules

* Fix code style

* Merge master

* Fix compilation failure

* Address comments

* Address comments

- Revert Sequence
- Add isInitialized() to Grouper
- Initialize the grouper in RowBasedGrouperHelper.Accumulator
- Simple refactoring RowBasedGrouperHelper.Accumulator
- Add tests for checking the number of used merge buffers
- Improve docs

* Revert unnecessary changes

* change to visible to testing

* fix misspelling
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