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