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https://issues.apache.org/jira/browse/SPARK-32771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17189828#comment-17189828
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Takeshi Yamamuro commented on SPARK-32771:
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Since v3.0.1 does not include this fix, I reset "Target Version/s" from 3.0.1
to 3.0.2.
> 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: Kousuke Saruta
> Priority: Minor
> Fix For: 2.4.7, 3.0.1, 3.1.0
>
>
> 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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