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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