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https://issues.apache.org/jira/browse/ARROW-17301?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kshiteej K reassigned ARROW-17301:
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Assignee: Kshiteej K (was: ChenTsing)
> [C++] Implement compute function "binary_slice"
> -----------------------------------------------
>
> Key: ARROW-17301
> URL: https://issues.apache.org/jira/browse/ARROW-17301
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Affects Versions: 8.0.1
> Reporter: ChenTsing
> Assignee: Kshiteej K
> Priority: Major
> Fix For: 11.0.0
>
>
> In some situations, may request an access method to get binary or sting
> likes array one or some continuous bytes , for example start 1 end 3 step 1,
> the two bytes, it seems like "{{{}binary_replace_slice{}}} " function,
> provide byte and code two measurement unit
>
>
> h1. *application case:*
>
> here, I can give one example to descirbe why need a function to extract
> binary in byte unit:
>
> In distribute database, data has distribute policy and relatived
> hash algorithm for different data type, here we just discuss string-like and
> binary type, the hash algorithm need detach string-like or binary in bytes to
> calculating, for example , take 1-4 byte cast to integer and shift-left 16
> bits, then take 5-6byte cast to integer and the result from last step, and so
> on, the 'utf8_slice_codeunits' function can partly meet the require if all
> are ascii, but if the string-like contain chinese, one chinese may occupied
> three bytes, start 1 to end 3, three utf8 character
> may take nine bytes, but it not meet the hash algorithm, it only need 3
> bytes, so if provide a function but not cast, the same function arguments
> like 'utf8_slice_codeunits', it may called 'binary_slice_byteunit'
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