Gian Merlino e86859b228 SQL support for nested groupBys. (#3806) ...

* SQL support for nested groupBys.

Allows, for example, doing exact count distinct by writing:

  SELECT COUNT(*) FROM (SELECT DISTINCT col FROM druid.foo)

Contrast with approximate count distinct, which is:

  SELECT COUNT(DISTINCT col) FROM druid.foo

* Add deeply-nested groupBy docs, tests, and maxQueryCount config.

* Extract magic constants into statics.

* Rework rules to put preconditions in the "matches" method.

2017-01-11 18:32:53 -08:00

..

src

SQL support for nested groupBys. (#3806)

2017-01-11 18:32:53 -08:00

pom.xml

Built-in SQL. (#3682)

2016-12-16 17:15:59 -08:00