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

["Danny Chen (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-16889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Danny Chen updated FLINK-16889:
-------------------------------
    Fix Version/s:     (was: 1.11.0)
                   1.12.0

> 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
>            Priority: Major
>              Labels: usability
>             Fix For: 1.12.0
>
>
> 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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