[jira] [Created] (FLINK-16889) Support converting BIGINT to TIMESTAMP for TO_TIMESTAMP function

[Shang Yuanchun (Jira)]

Jark Wu created FLINK-16889:
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             Summary: Support converting BIGINT to TIMESTAMP for TO_TIMESTAMP function
                 Key: FLINK-16889
                 URL: https://issues.apache.org/jira/browse/FLINK-16889
             Project: Flink
          Issue Type: New Feature
          Components: Table SQL / API, Table SQL / Planner
            Reporter: Jark Wu
             Fix For: 1.11.0


Many users reported that it is not possible for now to define an event-time field or watermark on a BIGINT column.

Impala supports to convert BIGINT into TIMESTAMP value using TO_TIMESTAMP() function [1]. The BIGINT argument represents the number of seconds past the epoch.

I think it makes sense to support this for Flink's TO_TIMESTAMP(). It is the converse of the UNIX_TIMESTAMP() function, which produces a BIGINT representing the number of seconds past the epoch.


[1]: https://impala.apache.org/docs/build/html/topics/impala_datetime_functions.html#datetime_functions__to_timestamp





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