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https://issues.apache.org/jira/browse/SPARK-57818?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Max Gekk updated SPARK-57818:
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Shepherd: Max Gekk
> Support nanosecond-precision and LTZ timestamps in convert_timezone
> -------------------------------------------------------------------
>
> Key: SPARK-57818
> URL: https://issues.apache.org/jira/browse/SPARK-57818
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.3.0
> Reporter: Max Gekk
> Priority: Major
>
> This sub-task is part of the umbrella SPARK-56822 (timestamps with nanosecond
> precision).
> h2. Problem
> {{ConvertTimezone}} (datetimeExpressions.scala ~L4192-4203) types its source
> as {{TimestampNTZType}} only and returns {{TimestampNTZType}}, using
> {{convertTimestampNtzToAnotherTz(Long, ...)}}. It rejects all nanosecond
> timestamp types.
> h2. Goal
> Support {{TIMESTAMP_NTZ(p)}} at nanosecond precision (keeping the existing
> NTZ contract), preserving {{nanosWithinMicro}}.
> h2. Scope
> Accept {{AnyTimestampNanoType}} (NTZ nanos) as source/result; add a
> {{TimestampNanosVal}} conversion path; keep the microsecond NTZ path intact.
> h2. Acceptance criteria
> * {{convert_timezone(sourceTz, targetTz, ts_ntz_nanos)}} returns a nanosecond
> NTZ value at the same precision with the remainder preserved.
> h2. Testing
> {{DateExpressionsSuite}}; nanos golden files.
> h2. Dependencies
> None - independent.
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