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https://issues.apache.org/jira/browse/SPARK-21144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16055283#comment-16055283
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Apache Spark commented on SPARK-21144:
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User 'maropu' has created a pull request for this issue:
https://github.com/apache/spark/pull/17758
> Unexpected results when the data schema and partition schema have the
> duplicate columns
> ---------------------------------------------------------------------------------------
>
> Key: SPARK-21144
> URL: https://issues.apache.org/jira/browse/SPARK-21144
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Xiao Li
>
> {noformat}
> withTempPath { dir =>
> val basePath = dir.getCanonicalPath
> spark.range(0, 3).toDF("foo").write.parquet(new Path(basePath,
> "foo=1").toString)
> spark.range(0, 3).toDF("foo").write.parquet(new Path(basePath,
> "foo=a").toString)
> spark.read.parquet(basePath).show()
> }
> {noformat}
> The result of the above case is
> {noformat}
> +---+
> |foo|
> +---+
> | 1|
> | 1|
> | a|
> | a|
> | 1|
> | a|
> +---+
> {noformat}
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