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https://issues.apache.org/jira/browse/SPARK-15983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15333141#comment-15333141
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Apache Spark commented on SPARK-15983:
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User 'liancheng' has created a pull request for this issue:
https://github.com/apache/spark/pull/13698
> Remove FileFormat.prepareRead
> -----------------------------
>
> Key: SPARK-15983
> URL: https://issues.apache.org/jira/browse/SPARK-15983
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Cheng Lian
> Assignee: Cheng Lian
>
> Interface method {{FileFormat.prepareRead()}} was added in [PR
> #12088|https://github.com/apache/spark/pull/12088] to handle a special case
> in the LibSVM data source.
> However, the semantics of this interface method isn't intuitive: it returns a
> modified version of the data source options map. Considering that the LibSVM
> case can be easily handled using schema metadata inside {{inferSchema}}, we
> can remove this interface method to keep the {{FileFormat}} interface clean.
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