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https://issues.apache.org/jira/browse/SPARK-22001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16165706#comment-16165706
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Apache Spark commented on SPARK-22001:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/19229

> ImputerModel can do withColumn for all input columns at one pass
> ----------------------------------------------------------------
>
>                 Key: SPARK-22001
>                 URL: https://issues.apache.org/jira/browse/SPARK-22001
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Liang-Chi Hsieh
>
> SPARK-21690 makes one-pass {{Imputer}} by parallelizing the computation of 
> all input columns. When we transform dataset with {{ImputerModel}}, we do 
> {{withColumn}} on all input columns sequentially. We can also do this on all 
> input columns at once.



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