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Posted to issues@flink.apache.org by "Jingsong Lee (JIRA)" <ji...@apache.org> on 2019/05/24 06:50:00 UTC

[jira] [Created] (FLINK-12611) Make time indicator nullable in blink

Jingsong Lee created FLINK-12611:
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             Summary: Make time indicator nullable in blink
                 Key: FLINK-12611
                 URL: https://issues.apache.org/jira/browse/FLINK-12611
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / Planner
            Reporter: Jingsong Lee
            Assignee: Jingsong Lee


SQL: select max(rowtime), count(a) from T

There will be a AssertionError: type mismatch:
aggCall type:
TIMESTAMP(3) NOT NULL
inferred type:
TIMESTAMP(3)

Agg type checking is done before TimeIndicator materializes. So there is a exception.

And before introducing nullable of LogicalType, we should modify this to avoid more potential TypeCheck problems.



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