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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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Leonard Xu updated FLINK-21713:
-------------------------------
Release Note:
Environment:
* 1.The CURRENT_TIMESTAMP function returned timestamp of UTC+0 timezone with
TIMESTAMP type, now it's corrected to return timestamp of local time zone with
TIMESTAMP_LTZ type.
* 2. Time function LOCALTIME, LOCALTIMESTAMP, CURRENT_DATE, CURRENT_TIME,
CURRENT_TIMESTAMP, NOW() was evaluated for per record no matter the job is
stream or batch. Now, it is corrected to evaluate for per record in stream job,
evaluate once at query-start for batch job.
> 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: * 1.The CURRENT_TIMESTAMP function returned timestamp of
> UTC+0 timezone with TIMESTAMP type, now it's corrected to return timestamp of
> local time zone with TIMESTAMP_LTZ type.
> * 2. Time function LOCALTIME, LOCALTIMESTAMP, CURRENT_DATE, CURRENT_TIME,
> CURRENT_TIMESTAMP, NOW() was evaluated for per record no matter the job is
> stream or batch. Now, it is corrected to evaluate for per record in stream
> job, 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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