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Gian Merlino 8276c031c5
Add druid.sql.approxCountDistinct.function property. (#11181) 
* Add druid.sql.approxCountDistinct.function property.

The new property allows admins to configure the implementation for
APPROX_COUNT_DISTINCT and COUNT(DISTINCT expr) in approximate mode.

The motivation for adding this setting is to enable site admins to
switch the default HLL implementation to DataSketches.

For example, an admin can set:

  druid.sql.approxCountDistinct.function = APPROX_COUNT_DISTINCT_DS_HLL

* Fixes

* Fix tests.

* Remove erroneous cannotVectorize.

* Remove unused import.

* Remove unused test imports.
 		2021-10-25 12:16:21 -07:00
..
src Add druid.sql.approxCountDistinct.function property. (#11181) 2021-10-25 12:16:21 -07:00
pom.xml Add druid.sql.approxCountDistinct.function property. (#11181) 2021-10-25 12:16:21 -07:00