[jira] [Resolved] (SPARK-30847) Take productPrefix into account in MurmurHash3.productHash

["Wenchen Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-30847?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-30847.
---------------------------------
    Fix Version/s: 3.0.0
       Resolution: Fixed

Issue resolved by pull request 27601
[https://github.com/apache/spark/pull/27601]

> Take productPrefix into account in MurmurHash3.productHash
> ----------------------------------------------------------
>
>                 Key: SPARK-30847
>                 URL: https://issues.apache.org/jira/browse/SPARK-30847
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.4.5, 3.0.0
>            Reporter: Hyukjin Kwon
>            Assignee: Hyukjin Kwon
>            Priority: Critical
>             Fix For: 3.0.0
>
>
> See the issue in https://github.com/scala/bug/issues/10495 and fix https://github.com/scala/scala/pull/7648.
> Currently, different expressions with same children can produce the same hash as below:
> {code}
> scala> spark.range(1).selectExpr("id - 1").queryExecution.analyzed.semanticHash()
> res0: Int = -565572825
> scala> spark.range(1).selectExpr("id + 1").queryExecution.analyzed.semanticHash()
> res1: Int = -565572825
> {code}
> The reason seems to be it doesn't take the product's class itself



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