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From "Apache Spark (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-32771) The example of expressions.Aggregator in Javadoc / Scaladoc is wrong
Date Tue, 01 Sep 2020 19:38:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-32771?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-32771:
------------------------------------

    Assignee: Apache Spark  (was: Kousuke Saruta)

> The example of expressions.Aggregator in Javadoc / Scaladoc is wrong
> --------------------------------------------------------------------
>
>                 Key: SPARK-32771
>                 URL: https://issues.apache.org/jira/browse/SPARK-32771
>             Project: Spark
>          Issue Type: Bug
>          Components: docs
>    Affects Versions: 3.0.0, 3.1.0
>            Reporter: Kousuke Saruta
>            Assignee: Apache Spark
>            Priority: Minor
>
> There is an example of expressions.Aggregator in Javadoc and Scaladoc like as follows.
> {code:java}
> val customSummer =  new Aggregator[Data, Int, Int] {
>   def zero: Int = 0
>   def reduce(b: Int, a: Data): Int = b + a.i
>   def merge(b1: Int, b2: Int): Int = b1 + b2
>   def finish(r: Int): Int = r
> }.toColumn(){code}
> But this example doesn't work because it doesn't define bufferEncoder and outputEncoder.



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