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https://issues.apache.org/jira/browse/SPARK-57558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Max Gekk reassigned SPARK-57558:
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Assignee: Max Gekk
> Add the LOCALTIME datetime value function
> -----------------------------------------
>
> Key: SPARK-57558
> URL: https://issues.apache.org/jira/browse/SPARK-57558
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.3.0
> Reporter: Max Gekk
> Assignee: Max Gekk
> Priority: Major
> Labels: pull-request-available
>
> h2. What
> Add the ANSI {{LOCALTIME}} datetime value function, returning the current
> local time as
> {{TIME}} (without time zone), with an optional precision argument
> {{LOCALTIME(p)}}.
> h2. Why
> ANSI SQL (6.32 <datetime value function>) defines both {{CURRENT_TIME}} (TIME
> WITH TIME
> ZONE) and {{LOCALTIME}} (TIME WITHOUT TIME ZONE). Spark registers
> {{current_time}},
> {{current_timestamp}}, and {{localtimestamp}}, but not {{localtime}}. Since
> Spark's TIME is
> always WITHOUT TIME ZONE, {{LOCALTIME}} is the standard-named counterpart to
> the existing
> {{localtimestamp}}.
> h2. Scope
> * Register {{localtime}} in {{FunctionRegistry}} next to
> {{current_time}}/{{localtimestamp}}.
> * Implement as an expression returning {{TimeType(p)}} from the session-local
> wall clock
> (reuse the {{CurrentTime}} implementation / constant-folding in
> {{finishAnalysis}}).
> * Parser support for the reserved-word form {{LOCALTIME}} (no parentheses),
> consistent with
> {{LOCALTIMESTAMP}}.
> h2. Acceptance criteria
> * {{SELECT LOCALTIME}}, {{SELECT LOCALTIME()}}, {{SELECT localtime(3)}} all
> return TIME at
> the requested precision.
> * Documented in the function reference; tests added.
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