Github user tedyu commented on a diff in the pull request: https://github.com/apache/spark/pull/9940#discussion_r51213703 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetRelation.scala --- @@ -258,7 +258,12 @@ private[sql] class ParquetRelation( job.setOutputFormatClass(classOf[ParquetOutputFormat[Row]]) ParquetOutputFormat.setWriteSupportClass(job, classOf[CatalystWriteSupport]) - CatalystWriteSupport.setSchema(dataSchema, conf) + + // We want to clear this temporary metadata from saving into Parquet file. + // This metadata is only useful for detecting optional columns when pushdowning filters. --- End diff -- nit: pushdowning -> pushing down
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