Github user MaxGekk commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20894#discussion_r176949956
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVOptions.scala
 ---
    @@ -150,6 +150,12 @@ class CSVOptions(
     
       val isCommentSet = this.comment != '\u0000'
     
    +  /**
    +   * The option enables checks of headers in csv files. In particular, 
column names
    +   * are matched to field names of provided schema.
    +   */
    +  val checkHeader = getBool("checkHeader", true)
    --- End diff --
    
    Yes, it will break apps that declare explicitly schemas with field names 
different from header's column names like for example in a test of the PR that 
I modified. I will add info about the option to exception's message and update 
the migration guide.


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