[jira] [Created] (FLINK-3971) Aggregates handle null values incorrectly.

["Fabian Hueske (JIRA)" <ji...@apache.org>]

Fabian Hueske created FLINK-3971:
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             Summary: Aggregates handle null values incorrectly.
                 Key: FLINK-3971
                 URL: https://issues.apache.org/jira/browse/FLINK-3971
             Project: Flink
          Issue Type: Bug
          Components: Table API
    Affects Versions: 1.1.0
            Reporter: Fabian Hueske
            Priority: Critical
             Fix For: 1.1.0


Table API and SQL aggregates are supposed to ignore null values, e.g., {{sum(1,2,null,4)}} is supposed to return {{7}}. 

There current implementation is correct if at least one valid value is present however, is incorrect if only null values are aggregated. {{sum(null, null, null)}} should return {{null}} instead of {{0}}

Currently only the Count aggregate handles the case of null-values-only correctly.



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