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https://issues.apache.org/jira/browse/FLINK-13755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bowen Li updated FLINK-13755:
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Attachment: (was: hive builtin functions that are missing in flink.txt)
> support Hive built-in functions in Flink
> ----------------------------------------
>
> Key: FLINK-13755
> URL: https://issues.apache.org/jira/browse/FLINK-13755
> Project: Flink
> Issue Type: New Feature
> Components: Connectors / Hive
> Affects Versions: 1.10.0
> Reporter: Bowen Li
> Assignee: Bowen Li
> Priority: Major
> Fix For: 1.10.0
>
> Attachments: common builtin functions is flink and hive.txt, hive
> builtin functions that are missing in flink.txt
>
>
> Unlike UDFs that are persisted in Hive Metastore, Hive builtin functions are
> registered into in-memory function catalog at runtime, which makes it hard
> for Flink to integrate with architecturely.
> One option to support rich Hive built-in functions is to develop builtin
> functions in Flink with the same logic. I did a simple comparison. With Flink
> 1.10.0 and Hive 2.3.4, they have 56 common (of same name) built-in functions;
> there are 195 functions in Hive 2.3.4 that don't exist in Flink 1.10.0.
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