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Posted to issues@spark.apache.org by "Xiao Li (JIRA)" <ji...@apache.org> on 2017/07/26 00:22:00 UTC

[jira] [Resolved] (SPARK-20586) Add deterministic to ScalaUDF

     [ https://issues.apache.org/jira/browse/SPARK-20586?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiao Li resolved SPARK-20586.
-----------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.0

> Add deterministic to ScalaUDF
> -----------------------------
>
>                 Key: SPARK-20586
>                 URL: https://issues.apache.org/jira/browse/SPARK-20586
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Xiao Li
>            Assignee: Xiao Li
>             Fix For: 2.3.0
>
>
> https://hive.apache.org/javadocs/r2.0.1/api/org/apache/hadoop/hive/ql/udf/UDFType.html
> Like Hive UDFType, we should allow users to add the extra flags for ScalaUDF too. {{stateful}}/{{impliesOrder}} are not applicable to ScalaUDF. Thus, we only add the following two flags. 
> - deterministic: Certain optimizations should not be applied if UDF is not deterministic. Deterministic UDF returns same result each time it is invoked with a particular input. This determinism just needs to hold within the context of a query.



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