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Posted to issues-all@impala.apache.org by "Tim Armstrong (JIRA)" <ji...@apache.org> on 2018/10/30 21:08:00 UTC

[jira] [Updated] (IMPALA-4606) Support DDL for specifying that a UDF is non-deterministic

     [ https://issues.apache.org/jira/browse/IMPALA-4606?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Armstrong updated IMPALA-4606:
----------------------------------
    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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