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https://issues.apache.org/jira/browse/SPARK-27751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16843818#comment-16843818
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Hyukjin Kwon commented on SPARK-27751:
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Yes, leaving them to be public brings overhead to maintain the compatibility.
`FileFormat` one will be supported via Datasource V2. `FileFormat` interface is
kind of not well designed.
> buildReader is now protected
> ----------------------------
>
> Key: SPARK-27751
> URL: https://issues.apache.org/jira/browse/SPARK-27751
> Project: Spark
> Issue Type: Question
> Components: Spark Core
> Affects Versions: 2.4.3
> Reporter: Geet Kumar
> Priority: Major
>
> I have recently upgraded to spark 2.4.0 and was relying on the `buildReader`
> method. It originally was public and now it is protected.
> What was the reason for this change?
> The only workaround I can see is to use `buildReaderWithPartitionValues`
> which remains public. Any plans to revert `buildReader` to be public again?
> The change was made here: [https://github.com/apache/spark/pull/17253/files]
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