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. [1] https://issues.apache.org/jira/browse/FLINK-4604# [2] https://issues.apache.org/jira/browse/FLINK-4604?focusedCommentId=15615280&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15615280 [3] https://issues.apache.org/jira/browse/FLINK-4604?focusedCommentId=15667697&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15667697 Regards, Anton Mushin
