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https://issues.apache.org/jira/browse/SPARK-19092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15823229#comment-15823229
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Apache Spark commented on SPARK-19092:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/16588
> Save() API of DataFrameWriter should not scan all the saved files
> -----------------------------------------------------------------
>
> Key: SPARK-19092
> URL: https://issues.apache.org/jira/browse/SPARK-19092
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Xiao Li
> Assignee: Xiao Li
> Fix For: 2.2.0
>
>
> `DataFrameWriter`'s save() API is performing a unnecessary full filesystem
> scan for the saved files. The save() API is the most basic/core API in
> `DataFrameWriter`. We should avoid these unnecessary file scan.
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