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https://issues.apache.org/jira/browse/FLINK-21713?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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lincoln lee updated FLINK-21713:
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Summary: Correct function
CURRENT_TIMESTAMP/CURRENT_TIME/CURRENT_DATE/NOW/LOCALTIME/LOCALTIMESTAMP (was:
Fix the determinism declaration of the rand function to be consistent with the
current behavior)
> Correct function
> CURRENT_TIMESTAMP/CURRENT_TIME/CURRENT_DATE/NOW/LOCALTIME/LOCALTIMESTAMP
> -----------------------------------------------------------------------------------------
>
> Key: FLINK-21713
> URL: https://issues.apache.org/jira/browse/FLINK-21713
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Environment: The value of time function CURRENT_TIMESTAMP and NOW()
> are corrected from UTC time with `TIMESTAMP` type to epoch time with
> `TIMESTAMP_LTZ` type. Time function LOCALTIME, LOCALTIMESTAMP, CURRENT_DATE,
> CURRENT_TIME, CURRENT_TIMESTAMP and NOW() are corrected from evaluates for
> per record in batch mode to evaluate once at query-start for batch job.
> Reporter: Leonard Xu
> Assignee: Leonard Xu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.13.0
>
>
> 1. fix the return value type as well the return value for following time
> functions
>
> |*function*|*existed problem*|*current behavior*|*proposed changes*|
> |CURRENT_DATE|returns UTC date, but user expects current date in session time
> zone|return type: DATE
> #session timezone: UTC
> 2020-12-28
> #session timezone: UTC+8
> 2020-12-28| return current date in session time zone, the return type should
> be *DATE*
> #session timezone: UTC
> 2020-12-28
> #session timezone: UTC+8
> 2020-12-29|
> |CURRENT_TIME|returns UTC time, but user expects current time in session time
> zone|return type: TIME
> #session timezone: UTC
> 23:52:52
> #session timezone: UTC+8
> 23:52:52|return current time in session time zone, the return type should be
> *TIME*
> #session timezone: UTC
> 23:52:52
> #session timezone: UTC+8
> 07:52:52|
> |CURRENT_TIMESTAMP|returns UTC timestamp, but user expects current timestamp
> in session time zone|
> return type: TIMESTAMP
> #session timezone: UTC
> 2020-12-28 23:52:52
> #session timezone: UTC+8
> 2020-12-28 23:52:52|return current timestamp in session time zone, the return
> type should be
> *TIMESTAMP WITH LOCAL TIME ZONE*
> #session timezone: UTC
> 2020-12-28 23:52:52
> #session timezone: UTC+8
> 2020-12-29 07:52:52|
> |NOW()|returns UTC timestamp, but user expects current timestamp in session
> time zone|
> return type: TIMESTAMP
> #session timezone: UTC
> 2020-12-28 23:52:52
> #session timezone: UTC+8
> 2020-12-28 23:52:52|return current timestamp in session time zone, the return
> type should be
> *TIMESTAMP WITH LOCAL TIME ZONE*
> #session timezone: UTC
> 2020-12-28 23:52:52
> #session timezone: UTC+8
> 2020-12-29 07:52:52|
>
> 2. The following functions' evaluation is depend on execution mode
> * LOCALTIME
> * LOCALTIMESTAMP
> * CURRENT_DATE
> * CURRENT_TIME
> * CURRENT_TIMESTAMP
> * NOW()
> Flink evaluates above time function values according to execution mode, i.e.
> Flink evaluates time function value for row level in Streaming mode,
> evaluates the time function value at query start for batch mode.
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