Github user koertkuipers commented on a diff in the pull request: https://github.com/apache/spark/pull/23173#discussion_r237716913 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/OutputWriter.scala --- @@ -57,6 +57,9 @@ abstract class OutputWriterFactory extends Serializable { * executor side. This instance is used to persist rows to this single output file. */ abstract class OutputWriter { + /** Initializes before writing any rows. Invoked on executor size. */ + def init(): Unit = {} --- End diff -- do the init logic in the constructor for CsvOutputWriter instead?
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