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https://issues.apache.org/jira/browse/SPARK-57816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Max Gekk updated SPARK-57816:
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Shepherd: Max Gekk
> Support nanosecond-precision timestamps in date_format, to_char and to_varchar
> ------------------------------------------------------------------------------
>
> Key: SPARK-57816
> URL: https://issues.apache.org/jira/browse/SPARK-57816
> 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
> {{DateFormatClass}} (datetimeExpressions.scala ~L1235-1252) has {{inputTypes
> = Seq(TimestampType, AnyTimeType)}} (or string) and formats
> {{timestamp.asInstanceOf[Long]}} micros; {{ToCharacterBuilder}}
> (numberFormatExpressions.scala ~L255-256) routes any {{DatetimeType}} (which
> includes the nanosecond types) into {{DateFormatClass}}. Nanosecond input is
> therefore narrowed to microseconds and the sub-microsecond digits never reach
> the formatter.
> h2. Goal
> Format nanosecond timestamps at full precision, honoring the pattern's
> fractional-second placeholders up to 9 digits, with correct NTZ
> (zone-independent) vs LTZ (session-zone) rendering.
> h2. Scope
> Accept {{AnyTimestampNanoType}} in {{DateFormatClass.inputTypes}}; add a
> {{TimestampNanosVal}} formatting path reusing the nanosecond-aware
> {{TimestampFormatter}} ({{formatNanos}} / {{formatWithoutTimeZoneNanos}});
> wire {{to_char}} / {{to_varchar}} accordingly.
> h2. Acceptance criteria
> * {{date_format(ts_nanos, "...SSSSSSSSS")}} and {{to_char(ts_nanos, ...)}}
> render up to nanosecond digits; NTZ vs LTZ zone behavior matches the
> microsecond types.
> h2. Testing
> {{DateFunctionsSuite}} / {{DateExpressionsSuite}}; nanos golden files.
> h2. Dependencies
> None - independent (uses the resolved nanosecond-aware formatter,
> SPARK-57162).
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