[SQL] Add support for distinct aggregations
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sql
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Description
Currently we reject aggregations with the DISTINCT flag set: [https://github.com/apache/beam/pull/8498](https://github.com/apache/beam/pull/8498)
We should provide support for these aggregations in a scalable way. See the ML discussion on this topic here: [https://lists.apache.org/thread.html/24081b0d0b7f9709a5c0f574149fb6b9e9759cba06734200cf3810bf@%3Cdev.beam.apache.org%3E](https://lists.apache.org/thread.html/24081b0d0b7f9709a5c0f574149fb6b9e9759cba06734200cf3810bf@%3Cdev.beam.apache.org%3E)
Imported from Jira [BEAM-7306](https://issues.apache.org/jira/browse/BEAM-7306). Original Jira may contain additional context.
Reported by: bhulette.
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