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https://issues.apache.org/jira/browse/SPARK-25389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-25389:
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Assignee: Apache Spark
> INSERT OVERWRITE DIRECTORY STORED AS should prevent duplicate fields
> --------------------------------------------------------------------
>
> Key: SPARK-25389
> URL: https://issues.apache.org/jira/browse/SPARK-25389
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.0, 2.3.1
> Reporter: Dongjoon Hyun
> Assignee: Apache Spark
> Priority: Major
>
> Like `INSERT OVERWRITE DIRECTORY USING` syntax, `INSERT OVERWRITE DIRECTORY
> STORED AS` should not generate files with duplicate fields because Spark
> cannot read those files.
> *INSERT OVERWRITE DIRECTORY USING*
> {code}
> scala> sql("INSERT OVERWRITE DIRECTORY 'file:///tmp/parquet' USING parquet
> SELECT 'id', 'id2' id")
> ... ERROR InsertIntoDataSourceDirCommand: Failed to write to directory ...
> org.apache.spark.sql.AnalysisException: Found duplicate column(s) when
> inserting into file:/tmp/parquet: `id`;
> {code}
> *INSERT OVERWRITE DIRECTORY STORED AS*
> {code}
> scala> sql("INSERT OVERWRITE DIRECTORY 'file:///tmp/parquet' STORED AS
> parquet SELECT 'id', 'id2' id")
> scala> spark.read.parquet("/tmp/parquet").show
> 18/09/09 22:09:57 WARN DataSource: Found duplicate column(s) in the data
> schema and the partition schema: `id`;
> {code}
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