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https://issues.apache.org/jira/browse/SPARK-57817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18093010#comment-18093010
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Rakesh Raushan commented on SPARK-57817:
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I would like to work on this
> Support nanosecond-precision timestamps in from_utc_timestamp and
> to_utc_timestamp
> ----------------------------------------------------------------------------------
>
> Key: SPARK-57817
> URL: https://issues.apache.org/jira/browse/SPARK-57817
> 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
> The {{UTCTimestamp}} base (datetimeExpressions.scala ~L2205-2278) uses
> {{inputTypes = Seq(TimestampType, StringType)}} and {{convertTz(Long, ...)}}.
> Nanosecond input is cast to microsecond LTZ, truncating the sub-microsecond
> part and imposing LTZ semantics.
> h2. Goal
> Shift a nanosecond timestamp between UTC and a target zone while preserving
> {{nanosWithinMicro}} and the input type/precision.
> h2. Scope
> Accept {{AnyTimestampNanoType}}; add a {{TimestampNanosVal}} eval/codegen
> path that applies the zone offset on the epoch micros and carries the
> nanosecond remainder unchanged.
> h2. Acceptance criteria
> * {{from_utc_timestamp}} / {{to_utc_timestamp}} over nanosecond timestamps
> preserve the nanosecond remainder and the input type/precision; existing
> microsecond behavior unchanged.
> h2. Testing
> {{DateExpressionsSuite}}; nanos golden files.
> h2. Dependencies
> None - independent.
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