Hyunseok Seo

GH-39669: [C++][Gandiva] Ensure Gandiva benchmarks present a bytes/s or items/s metric

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### Rationale for this change The Gandiva microbenchmarks only present an iteration time in (nano,micro...)seconds. That is usually tedious to read and difficult to interpret. ### What changes are included...

GH-39182: [C++] Remove Legacy CastTo function

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### Rationale for this change Remove legacy `CastTo` function. ### What changes are included in this PR? * Remove legacy `CastTo` function. * Replace `CastTo` to `Cast` function for ToString...

Rename 'Apache Arrow DataFusion' to 'Apache DataFusion' across all references

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# Which issue does this PR close? Closes #1016 # Rationale for this change Reflect the project's elevation from a subproject to a top-level project by updating documentation and reference...

**Is your feature request related to a problem or challenge? Please describe what you are trying to do.** Need to update DataFusion references post-promotion to top-level project. **Describe the solution...

GH-41389: [Python] Expose byte_width and bit_width of ExtensionType in terms of the storage type

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### Rationale for this change This update aligns the Python API with Arrow C++ by exposing the actual byte and bit widths of extension types from their storage type. ###...

GH-40282: [Python] Use C++ type traits for is_nested function

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### Rationale for this change Use C++ type traits for `is_nested` function to avoid redefining in Python ### What changes are included in this PR? Expose `is_nested` function ### Are...