Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20649#discussion_r170256030
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala ---
@@ -284,7 +286,8 @@ case class StructType(fields: Array[StructField])
extends DataType with Seq[Stru
val nonExistFields = names -- fieldNamesSet
if (nonExistFields.nonEmpty) {
throw new IllegalArgumentException(
- s"Field ${nonExistFields.mkString(",")} does not exist.")
+ s"""Fields ${nonExistFields.mkString(",")} does not exist.
+ |Available fields:
${fieldNamesSet.mkString(",")}""".stripMargin)
--- End diff --
ditto
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