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arrow-buffer: add i256::trailing_zeros #8968

@theirix

Description

@theirix

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

Function trailing_zeros exists for other integer types, and for a wide i128 as well. It's worth adding it.

Describe the solution you'd like

I added a PR with the function

Describe alternatives you've considered

Coding it as an external function - not an ergonomic solution

Additional context

Sister ticket is #8965
Required particularly for DataFusion UDF implementations.

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    arrowChanges to the arrow crateenhancementAny new improvement worthy of a entry in the changelog

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