[jira] [Assigned] (SPARK-25134) Csv column pruning with checking of headers throws incorrect error

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-25134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-25134:
------------------------------------

    Assignee: Apache Spark

> Csv column pruning with checking of headers throws incorrect error
> ------------------------------------------------------------------
>
>                 Key: SPARK-25134
>                 URL: https://issues.apache.org/jira/browse/SPARK-25134
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.3.1
>         Environment: spark master branch at a791c29bd824adadfb2d85594bc8dad4424df936
>            Reporter: koert kuipers
>            Assignee: Apache Spark
>            Priority: Minor
>
> hello!
> seems to me there is some interaction between csv column pruning and the checking of csv headers that is causing issues. for example this fails:
> {code:scala}
> Seq(("a", "b")).toDF("columnA", "columnB").write
>   .format("csv")
>   .option("header", true)
>   .save(dir)
> spark.read
>   .format("csv")
>   .option("header", true)
>   .option("enforceSchema", false)
>   .load(dir)
>   .select("columnA")
>   .show
> {code}
> the error is:
> {code:bash}
> 291.0 (TID 319, localhost, executor driver): java.lang.IllegalArgumentException: Number of column in CSV header is not equal to number of fields in the schema:
> [info]  Header length: 1, schema size: 2
> {code}
> if i remove the project it works fine. if i disable column pruning it also works fine.



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