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[Kernel] [CC Refactor] Make Metadata implement AbstractMetadata; fix Metadata partition col APIs #3834

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Which Delta project/connector is this regarding?

  • Spark
  • Standalone
  • Flink
  • Kernel
  • Other (fill in here)

Description

  • Make Metadata implement AbstractMetadata
  • Update kernel's AbstractMetadata to align it with delta-storage's AbstractMetadata (storage uses Long for createdTime, kerenel used Optional).
  • Update kernel's AbstractMetadata to all @Nulalble annotations to make it clear the expected return values.
  • Consolidate Metadata's getPartitionColumn APIs (there were two APIs, with different return types and different case-sensitivities; now there's only 1 API)

How was this patch tested?

Just a refactor. Existing UTs.

Does this PR introduce any user-facing changes?

No.

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