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perf: Optimize initcap scalar performance #19776

kumarUjjawal wants to merge 1 commit into from
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@kumarUjjawal kumarUjjawal commented Jan 13, 2026

Which issue does this PR close?

Rationale for this change

  • initcap uses make_scalar_function which converts scalar inputs to arrays.

What changes are included in this PR?

  • Add scalar fast path for Utf8/LargeUtf8/Utf8View inputs
  • Reuse existing initcap_string helper for direct scalar processing

Are these changes tested?

Yes. Unit tests and sqllogictest pass.

Benchmark Results

Type Before After Speedup
scalar_utf8 698 ns 250 ns 2.8x
scalar_utf8view 729 ns 248 ns 2.9x

Measured using:

cargo bench -p datafusion-functions --bench initcap -- "scalar"

Are there any user-facing changes?

No

@github-actions github-actions bot added the functions Changes to functions implementation label Jan 13, 2026
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@Jefffrey Jefffrey Jefffrey approved these changes

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@kumarUjjawal @Jefffrey