[jira] [Updated] (SPARK-57820) Support nanosecond-precision timestamps in time_bucket

["Max Gekk (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-57820?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Max Gekk updated SPARK-57820:
-----------------------------
    Shepherd: Max Gekk

> Support nanosecond-precision timestamps in time_bucket
> ------------------------------------------------------
>
>                 Key: SPARK-57820
>                 URL: https://issues.apache.org/jira/browse/SPARK-57820
>             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
> {{TimeBucket}} (datetimeExpressions.scala ~L4433-4498) types its timestamp/origin args as {{AnyTimestampType}} and casts the timestamp to {{Long}} micros in {{nullSafeEval}}, so nanosecond timestamps are rejected / narrowed.
> h2. Goal
> Bucket a nanosecond timestamp by an interval width, returning the same nanosecond type/precision with {{nanosWithinMicro}} handled consistently with the bucket width.
> h2. Scope
> Accept {{AnyTimestampNanoType}}; add a {{TimestampNanosVal}} bucketing path.
> h2. Acceptance criteria
> * {{time_bucket(width, ts_nanos[, origin])}} returns aligned nanosecond buckets; microsecond behavior unchanged.
> h2. Testing
> {{DateExpressionsSuite}}; nanos golden files.
> h2. Dependencies
> None - independent.



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