Andrei Stefan 4a92de214a
SQL: Proper handling of COUNT(field_name) and COUNT(DISTINCT field_name) (#37254)
* provide overriden `hashCode` and toString methods to account for `DISTINCT`
* change the analyzer for scenarios where `COUNT <field_name>` and `COUNT DISTINCT` have different paths
* defined a new `filter` aggregation encapsulating an `exists` query to filter out null or missing values
2019-01-10 09:51:51 +02:00
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