vinodkc opened a new pull request, #39449:
URL: https://github.com/apache/spark/pull/39449
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### What changes were proposed in this pull request?
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This PR supports data masking built-in Function **mask_first_n**,
Returns a masked version of str with the first n values masked.
By default, first 4 characters will be masked, upper case letters will be
converted to "X", lower case letters will be converted to "x" and numbers will
be converted to "n".
For example, mask_first_n("**1234-5678-8765-4321**", 4) results in
nnnn-5678-8765-4321.
Can override the characters used in the mask by supplying additional
arguments: second argument control the number of charatcters to be masked, the
third argument controls the mask character for upper case letters, the fourth
argument for lower case letters and the fifth argument for numbers.
For example, mask_first_n("**abcd-EFGH-8765-4321-abcd-EFGH-8765-4321", 19,
"U", "l", "#**") will return **llll-UUUU-####-####-abcd-EFGH-8765-4321**
Examples:
```
> SELECT _FUNC_('abcd-EFGH-8765-4321');
xxxx-EFGH-8765-4321
> SELECT _FUNC_('abcd-EFGH-8765-4321', 9);
xxxx-XXXX-8765-4321
> SELECT _FUNC_('abcd-EFGH-8765-@$#', 14);
xxxx-XXXX-nnnn-@$#
> SELECT _FUNC_('abcd-EFGH-8765-@$#', 15, 'x', 'X', 'n', 'o');
XXXXoxxxxonnnno@$#
> SELECT _FUNC_('abcd-EFGH-8765-@$#', 20, 'x', 'X', 'n', 'o');
XXXXoxxxxonnnnoooo
> SELECT _FUNC_('AbCD123-@$#', 10,'Q', 'q', 'd', 'o');
QqQQdddooo#
> SELECT _FUNC_('AbCD123-@$#', 10, -1, 'q', 'd', 'o');
AqCDdddooo#
> SELECT _FUNC_('AbCD123-@$#', 10, -1, -1, 'd', 'o');
AbCDdddooo#
> SELECT _FUNC_('AbCD123-@$#', 10, -1, -1, -1, 'o');
AbCD123ooo#
> SELECT _FUNC_(NULL);
NULL
> SELECT _FUNC_(NULL, 1, -1, -1, 'o');
NULL
```
### Why are the changes needed?
To support data masking built-in function **mask_first_n**, which returns a
masked version of the input string
Ref : [Data masking
functions](https://cwiki.apache.org/confluence/display/hive/languagemanual+udf#LanguageManualUDF-DataMaskingFunctions)
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### Does this PR introduce _any_ user-facing change?
Yes, added a new build-in function named '**mask_first_n**'
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### How was this patch tested?
Added test cases
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