tree f38381009939fce4b0e8576512b023aaf59c7549
parent 8e8f5d0104478e548f0cb2705ea834823f90ef4d
author Dmitry Lychagin <dmitry.lychagin@couchbase.com> 1556255185 -0700
committer Dmitry Lychagin <dmitry.lychagin@couchbase.com> 1556319533 +0000

[NO ISSUE][COMP] Refactor physical operators for GroupBy and DistinctBy

- user model changes: no
- storage format changes: no
- interface changes: no

Details:
- Introduce AbstractGroupByPOperator -
  base class for physical GroupBy operators
- Introduce AbstractDistinctByPOperator -
  base class for physical DistinctBy operators
- Set memory limit for MicroPreclusteredGroupByPOperator
- Remove unused PhysicalOperatorTag.HASH_GROUP_BY
- Rename GroupByOperator.getGbyVarList() to getGroupByVarList()
- Remove constructors that do not specify memory limit from
  PreclusteredGroupOperatorDescriptor and PreclusteredGroupWriter

Change-Id: I93f17a6a3e0df6587e518e18eea01ca54a289b4c
Reviewed-on: https://asterix-gerrit.ics.uci.edu/3364
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Ali Alsuliman <ali.al.solaiman@gmail.com>