Add arrow conversion support for timestamp nanoseconds logical type.

[claudevdm]

Arrow timestamp nanoseconds maps to beam timestamp logical type with nanosecond precision, which is backed by java.time.Instant.

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[claudevdm]

R: @Abacn

[gemini-code-assist]

Summary of Changes

Hello @claudevdm, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request extends the Apache Beam Arrow extension to fully support timestamp values with nanosecond precision. It addresses a gap where only millisecond and microsecond precision timestamps were explicitly handled, ensuring that Arrow's nanosecond timestamp logical type is correctly mapped to Beam's java.time.Instant backed nanosecond timestamp. This enhancement improves data fidelity and compatibility when exchanging timestamp data between Arrow and Beam, allowing for more granular time representations.

Highlights

• Nanosecond Timestamp Support: Added support for converting Arrow timestamp logical types with nanosecond precision to Beam's Timestamp.NANOS logical type, which is backed by java.time.Instant.
• Schema Conversion Logic: Modified the ArrowConversion utility to correctly map Arrow TimeUnit.NANOSECOND to Beam's nanosecond timestamp logical type during schema translation.
• Data Conversion Logic: Implemented the necessary logic to convert epoch nanosecond values from Arrow to java.time.Instant objects when reading data.
• New Test Cases: Introduced a dedicated test case to verify the correct schema conversion for nanosecond timestamps and updated an existing integration test to include nanosecond timestamp data.

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[claudevdm]

R: @ahmedabu98

[github-actions]

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[github-actions]

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