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Posted to issues@flink.apache.org by "Chengxiang Li (JIRA)" <ji...@apache.org> on 2015/12/08 07:05:10 UTC

[jira] [Created] (FLINK-3139) NULL values handling in Table API

Chengxiang Li created FLINK-3139:
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             Summary: NULL values handling in Table API
                 Key: FLINK-3139
                 URL: https://issues.apache.org/jira/browse/FLINK-3139
             Project: Flink
          Issue Type: Task
          Components: Table API
            Reporter: Chengxiang Li


This is an umbrella task for NULL value handling in Table API. 
As the logical API for queries, Table API should support handling NULL values, NULL value is quite a common case during logical query, for example:
# Data source may miss column value in many cases("value missing", "value unknown", "value not applicable" .etc ).
# Some operators generate Null values on their own, like Outer Join/Cube/Rollup/Grouping Set, and so on. Null values handling in Table API is the prerequisite of these features.




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