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https://issues.apache.org/jira/browse/ARROW-14482?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Augusto Alves Silva closed ARROW-14482.
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> [C++][Gandiva] Implement MASK_FIRST_N and MASK_LAST_N functions
> ---------------------------------------------------------------
>
> Key: ARROW-14482
> URL: https://issues.apache.org/jira/browse/ARROW-14482
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++ - Gandiva
> Reporter: Augusto Alves Silva
> Priority: Minor
> Labels: pull-request-available
> Fix For: 7.0.0
>
> Time Spent: 10h
> Remaining Estimate: 0h
>
> *MASK_FIRST_N*
> {color:#172b4d}Returns a masked version of str with the first n values
> masked.{color}{color:#172b4d} Upper case letters are converted to "X", lower
> case letters are converted to "x" and numbers are converted to "n". For
> example, mask_first_n("1234-5678-8765-4321", 4) results in
> nnnn-5678-8765-4321.
> *MASK_LAST_N*
> Returns a masked version of str with the last n values masked. Upper case
> letters are converted to "X", lower case letters are converted to "x" and
> numbers are converted to "n". For example, mask_last_n("1234-5678-8765-4321",
> 4) results in 1234-5678-8765-nnnn.{color}
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