Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/7013#discussion_r33710275
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/json/JSONRelation.scala ---
@@ -37,6 +37,17 @@ private[sql] class DefaultSource
parameters.getOrElse("path", sys.error("'path' must be specified for
json data."))
}
+ /** Constraints to be imposed on dataframe to be stored. */
+ private def checkConstraints(data: DataFrame): Unit = {
+ if (data.schema.fieldNames.length !=
data.schema.fieldNames.distinct.length) {
+ val duplicateColumns =
data.schema.fieldNames.groupBy(identity).collect {
+ case (x, ys) if ys.length > 1 => "\"" + x + "\""
+ }.mkString(", ")
+ throw new IOException(s"Duplicate column(s) : $duplicateColumns
found, " +
--- End diff --
Should be an `AnalysisException` probably.
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