[jira] [Updated] (SPARK-57813) Support nanosecond-precision timestamps as file-source partition columns

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

     [ https://issues.apache.org/jira/browse/SPARK-57813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Max Gekk updated SPARK-57813:
-----------------------------
    Shepherd: Max Gekk

> Support nanosecond-precision timestamps as file-source partition columns
> ------------------------------------------------------------------------
>
>                 Key: SPARK-57813
>                 URL: https://issues.apache.org/jira/browse/SPARK-57813
>             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
> In {{PartitioningUtils}} both partition paths are microsecond-only:
> * {{inferPartitionColumnValue}} (datasources/PartitioningUtils.scala ~L498-510) only tries {{conf.timestampType}} (micro {{TimestampType}} / {{TimestampNTZType}});
> * {{castPartValueToDesiredType}} (~L565-575) gates on {{AnyTimestampType}} (which excludes nanos) and otherwise throws "Unsupported partition type".
> So a nanosecond timestamp column cannot be used as a partition column even with an explicit schema.
> h2. Goal
> Allow nanosecond timestamps as partition columns - cast partition string values to the declared nanosecond type (explicit schema), and optionally infer nanosecond precision from partition values.
> h2. Scope
> Extend {{castPartValueToDesiredType}} to handle {{AnyTimestampNanoType}} via {{Cast}}; extend {{inferPartitionColumnValue}} to consider nanosecond precision when inferring.
> h2. Acceptance criteria
> * Reading a partitioned path with a nanosecond partition column (explicit schema) works; partition pruning on nanosecond partition values works.
> h2. Testing
> {{ParquetPartitionDiscoverySuite}} / {{FileIndexSuite}}-style tests for nanosecond partition columns.
> h2. Dependencies
> None - independent (builds on resolved casts).



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