GitHub user docete opened a pull request:

    [FLINK-3475] [Table] DISTINCT aggregate function support for SQL queries

    Copy calcite's AggregateExpandDistinctAggregatesRule to Flink project, and 
do a quick fix to avoid some bad case mentioned in CALCITE-1558. This rule let 
Flink support distinct aggregate functions.

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    $ git pull master

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #3111
commit dc417f27d3d2f3644de7b8873577c5ed6d93230e
Author: Zhenghua Gao <>
Date:   2017-01-12T02:33:27Z

    [FLINK-3475] DISTINCT aggregate function support for SQL queries


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