AryanBagade opened a new pull request, #19125:
URL: https://github.com/apache/datafusion/pull/19125
## Which issue does this PR close?
Implements #19074
## Rationale for this change
As the default cache implementations expand, the module structure under
`datafusion/execution/src/cache/` has become crowded. This PR continues the
pattern established in #18855 by separating `DefaultFilesMetadataCache` into
its own module to improve code organization and maintainability.
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## What changes are included in this PR?
- Created new `file_metadata_cache.rs` module containing:
- `DefaultFilesMetadataCacheState` (internal state management)
- `DefaultFilesMetadataCache` (public struct and implementation)
- All trait implementations (`FileMetadataCache` and `CacheAccessor`)
- All 3 related tests and test helpers
- Updated `mod.rs` to declare and export the new module
- Updated `cache_manager.rs` to import from new location
- Cleaned up `cache_unit.rs` (reduced from 863 to 159 lines)
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## Are these changes tested?
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Yes, all existing tests have been moved to the new module and pass
successfully
## Are there any user-facing changes?
No user-facing changes. This is purely an internal code organization
refactoring.
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