Fix group by array low cardinality arguments#4055

Merged

alexey-milovidov merged 2 commits intomasterfrom fix-group-by-array-low-cardibality-arguments

Jan 29, 2019

+88-14

Commits on Jan 14, 2019

Fix aggregate function low cardinality array argument. #4038
KochetovNicolai
committed

Commits on Jan 29, 2019

Added tests. Restored recursiveRemoveLowCardinality interface.
KochetovNicolai
committed