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https://issues.apache.org/jira/browse/HIVE-6108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14487603#comment-14487603
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Alan Gates commented on HIVE-6108:
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Ok, so this review is way overdue, but better late than never
A few issues
# You should consider using GenericUDF rather than UDF, see the comments in
those classes on why.
# When errors are encountered in the code it should write to the log rather
than System.out. See many places in the Hive code for examples.
# We cannot have any System.exit calls in the code. Some of this code runs in
servers that cannot exit. Exceptions should be thrown instead.
> Introduce Cryptographic hash UDFs
> ---------------------------------
>
> Key: HIVE-6108
> URL: https://issues.apache.org/jira/browse/HIVE-6108
> Project: Hive
> Issue Type: New Feature
> Components: UDF
> Reporter: Kostiantyn Kudriavtsev
> Assignee: Kostiantyn Kudriavtsev
> Priority: Minor
> Attachments: Hive-6108.patch
>
>
> Introduce new UDF to implement Cryptographic hash algorithms: MD5 and SHA-256
> which is already available in Java:
> MD5(string) Calculates an MD5 checksum for the string, return HEX
> representation
> SHA256(string) Calculates an SHA-256 checksum for the string, return HEX
> representation
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