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https://issues.apache.org/jira/browse/SPARK-40687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17677988#comment-17677988
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Vinod KC commented on SPARK-40687:
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Note: Please refer
[SPARK-42070|https://issues.apache.org/jira/browse/SPARK-42070] , it changes
the default value of argument of Mask udf from -1 to NULL
> Support data masking built-in Function 'mask'
> ----------------------------------------------
>
> Key: SPARK-40687
> URL: https://issues.apache.org/jira/browse/SPARK-40687
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: Vinod KC
> Assignee: Vinod KC
> Priority: Minor
> Fix For: 3.4.0
>
>
> Support data masking built-in Function *mask*
> Return a masked version of str. By default, upper case letters should be
> converted to "X", lower case letters should be converted to "x" and numbers
> should be converted to "n". For example mask("abcd-EFGH-8765-4321") results
> in xxxx-XXXX-nnnn-nnnn. Should be able override the characters used in the
> mask by supplying additional arguments: the second argument controls the mask
> character for upper case letters, the third argument for lower case letters
> and the fourth argument for numbers. For example, mask("abcd-EFGH-8765-4321",
> "U", "l", "#") should result in llll-UUUU-####-####
>
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