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https://issues.apache.org/jira/browse/CASSANDRA-17941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17611542#comment-17611542
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Andres de la Peña commented on CASSANDRA-17941:
-----------------------------------------------
Here is the patch adding the functions:
||PR||CI||
|[trunk|https://github.com/apache/cassandra/pull/1892]|[j8|https://app.circleci.com/pipelines/github/adelapena/cassandra/2091/workflows/1d94a287-a23f-4c6c-a594-27b2edd18a77]
[j11|https://app.circleci.com/pipelines/github/adelapena/cassandra/2091/workflows/e30934ad-a415-403e-9760-14f8ef9ccda9]|
And here is the documentation of each function:
||Function||Description||
|mask_null(value)|Replaces the first argument by null.
Examples:
mask_null('Alice') → null
mask_null(123) → null|
|mask_default(value)|Replaces its argument by an arbitrary, fixed default value
of the same type. This will be **** for text values, zero for numeric values,
false for booleans, etc.
Examples:
mask_default('Alice') → '****'
mask_default(123) → 0|
|mask_replace(value, replacement])|Replaces the first argument by the
replacement value on the second argument. Both arguments should have the same
type.
Examples:
mask_replace('Alice', 'REDACTED') → 'REDACTED'
mask_replace(123, -1) → -1|
|mask_inner(value, begin, end, [padding])|Returns the text representation of
the first argument, replacing each character except the first and last ones by
a padding character. The 2nd and 3rd arguments are the size of the exposed
prefix and suffix. The optional 4th argument is the padding character, * by
default.
Examples:
mask_inner('Alice', 1, 2) → 'A**ce'
mask_inner('Alice', 2, 1, '#') → 'Al##e'|
|mask_outer(value, begin, end, [padding])|Returns the text representation of
the first argument, replacing the first and last character by a padding
character. The 2nd and 3rd arguments are the size of the exposed prefix and
suffix. The optional 4th argument is the padding character, * by default.
Examples:
mask_outer('Alice', 1, 2) → '*li*'
mask_outer('Alice', 2, 1, '#') → '##ic#'|
|mask_hash(value, [algorithm])|Returns a blob containing the hash of the first
argument. The optional 2nd argument is the hashing algorithm to be used,
according the available Java security provider. The default hashing algorithm
is SHA-256.
Examples:
mask_hash('Alice')
mask_hash('Alice', 'SHA-512')|
> CQL data masking functions
> --------------------------
>
> Key: CASSANDRA-17941
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17941
> Project: Cassandra
> Issue Type: New Feature
> Components: Feature/Dynamic Data Masking
> Reporter: Andres de la Peña
> Assignee: Andres de la Peña
> Priority: Normal
> Fix For: 4.x
>
>
> Add native CQL functions to mask the contents of a column, as described in
> [CEP-20|https://cwiki.apache.org/confluence/display/CASSANDRA/CEP-20%3A+Dynamic+Data+Masking].
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