Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21667#discussion_r199416587
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala
---
@@ -306,6 +306,7 @@ case class FileSourceScanExec(
}
private lazy val inputRDD: RDD[InternalRow] = {
+ DataSourceUtils.verifyReadSchema(relation.fileFormat,
relation.dataSchema)
--- End diff --
In some formats, is this verification applied two times, right?
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