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https://issues.apache.org/jira/browse/IMPALA-4606?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong updated IMPALA-4606:
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Issue Type: New Feature (was: Bug)
> Support DDL for specifying that a UDF is non-deterministic
> ----------------------------------------------------------
>
> Key: IMPALA-4606
> URL: https://issues.apache.org/jira/browse/IMPALA-4606
> Project: IMPALA
> Issue Type: New Feature
> Components: Frontend
> Affects Versions: Impala 2.8.0
> Reporter: Tim Armstrong
> Priority: Major
>
> Currently Impala assumes that all UDFs are deterministic: will produce the
> same result every time they are evaluated with the same argument values
> within the context of a query. We should distinguish between deterministic
> and non-deterministic UDFs so that the planner can correctly handle both
> cases.
> Hive has some support for specifying this, e.g. see:
> http://mark.thegrovers.ca/tech-blog/how-to-write-a-hive-udf
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