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From Anton Mushin <>
Subject Null literals in AggregateReduceFunctionsRule
Date Thu, 02 Feb 2017 08:57:21 GMT
Hello community,
I have worked for support  standard deviation/variance functions in Flink SQL [1] and I got
exception " Type NULL is not supported. Null values must have a supported type.". 
I started search root cause and found what problem come up from AggregateReduceFunctionsRule[2].
 @twalthr confirmed it after[3].

Now I have been used WA - the copy AggregateReduceFunctionsRule inside Flink with changes.
Could we resolve the problem some way?
I look forward to your reply.


Anton Mushin

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