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From "Xiao Li (JIRA)" <>
Subject [jira] [Updated] (SPARK-20586) Add deterministic to ScalaUDF
Date Wed, 26 Jul 2017 00:21:00 GMT


Xiao Li updated SPARK-20586:
    Summary: Add deterministic to ScalaUDF  (was: Add deterministic and distinctLike to ScalaUDF)

> Add deterministic to ScalaUDF
> -----------------------------
>                 Key: SPARK-20586
>                 URL:
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Xiao Li
>            Assignee: Xiao Li
> 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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