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Posted to issues@spark.apache.org by "Xiao Li (JIRA)" <ji...@apache.org> on 2017/07/26 00:21:00 UTC
[jira] [Updated] (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 updated SPARK-20586:
----------------------------
Summary: Add deterministic to ScalaUDF (was: Add deterministic and distinctLike to ScalaUDF)
> 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
>
> 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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