desmondcheongzx commented on code in PR #46071:
URL: https://github.com/apache/spark/pull/46071#discussion_r1567667735
##########
sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala:
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@@ -766,6 +769,17 @@ class DataFrameReader private[sql](sparkSession:
SparkSession) extends Logging {
}
}
+ /**
+ * Ensure that the `singleVariantColumn` option cannot be used if there is
also a user specified
+ * schema.
+ */
+ private def validateSingleVariantColumn(): Unit = {
Review Comment:
If I understand correctly, in that case we'll also have to add the checks to
the dataset readers, e.g. `def json(jsonDataset: Dataset[String]): DataFrame`,
since these paths don't go through `load`.
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