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https://issues.apache.org/jira/browse/IMPALA-10388?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Quanlong Huang resolved IMPALA-10388.
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Fix Version/s: Impala 4.0
Resolution: Fixed
> Document the limitation on mask functions
> -----------------------------------------
>
> Key: IMPALA-10388
> URL: https://issues.apache.org/jira/browse/IMPALA-10388
> Project: IMPALA
> Issue Type: Documentation
> Components: Docs
> Reporter: Quanlong Huang
> Assignee: shajini thayasingh
> Priority: Major
> Fix For: Impala 4.0
>
>
> Hive's mask functions are GenericUDFs. Impala currently doesn't support Hive
> GenericUDFs, so we have our builtin implementation for them. Due to lack of a
> corresponding framework for GenericUDF in Impala (IMPALA-9271), we implement
> these mask functions by overloads. However, it may requires hundreds of
> overloads to cover all possible combinations. We just implement some
> important overloads, including
> * those used by Ranger default masking policies,
> * those with simple arguments and may be useful for users,
> * an overload with all arguments in int type for full functionality. Char
> argument need to be converted to their ASCII value.
> If you encountered errors like "No matching function with signature:
> mask...", it means Impala is lack of the corresponding overload. Use the
> following query to find the available overloads:
> {code:sql}
> show functions in _impala_builtins like "mask*";
> {code}
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