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https://issues.apache.org/jira/browse/SPARK-57819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Max Gekk updated SPARK-57819:
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Shepherd: Max Gekk
> Support nanosecond-precision timestamps in months_between
> ---------------------------------------------------------
>
> Key: SPARK-57819
> URL: https://issues.apache.org/jira/browse/SPARK-57819
> 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
> {{MonthsBetween}} (datetimeExpressions.scala ~L2461-2470) types its args as
> {{Seq(TimestampType, TimestampType, BooleanType)}} and calls
> {{DateTimeUtils.monthsBetween(Long, Long, ...)}}. Nanosecond args are cast to
> microsecond LTZ, so the sub-microsecond part is ignored and NTZ nanos gets
> LTZ semantics.
> h2. Goal
> Accept nanosecond timestamps and include the {{nanosWithinMicro}} remainder
> in the fractional-month computation (matching how the microsecond path
> already uses the sub-second time-of-day).
> h2. Scope
> Accept {{AnyTimestampNanoType}}; add a {{TimestampNanosVal}}-aware
> {{monthsBetween}} path.
> h2. Acceptance criteria
> * {{months_between}} over nanosecond timestamps matches the microsecond
> result when the remainder is zero and reflects sub-microsecond differences
> otherwise; {{roundOff}} semantics preserved.
> h2. Testing
> {{DateExpressionsSuite}}; nanos golden files.
> h2. Dependencies
> None - independent.
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