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https://issues.apache.org/jira/browse/SPARK-26312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16715963#comment-16715963
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ASF GitHub Bot commented on SPARK-26312:
----------------------------------------

HyukjinKwon commented on issue #23262: [SPARK-26312][SQL]Replace 
RDDConversions.rowToRowRdd with RowEncoder to improve its conversion performance
URL: https://github.com/apache/spark/pull/23262#issuecomment-446042871
 
 
   Weird. My remote is as below FWIW.
   
   ```
   $ git remote -v
   apache       https://gitbox.apache.org/repos/asf/spark.git (fetch)
   apache       https://gitbox.apache.org/repos/asf/spark.git (push)
   ...
   ```

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> Converting converters in RDDConversions into arrays to improve their access 
> performance
> ---------------------------------------------------------------------------------------
>
>                 Key: SPARK-26312
>                 URL: https://issues.apache.org/jira/browse/SPARK-26312
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.4.0
>            Reporter: eaton
>            Assignee: eaton
>            Priority: Major
>             Fix For: 3.0.0
>
>
> `RDDConversions` would get disproportionately slower as the number of columns 
> in the query increased.
> This PR converts the `converters` in `RDDConversions` into arrays to improve 
> their access performance, the type of `converters` before is 
> `scala.collection.immutable.::` which is a subtype of list.



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