Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/2209#discussion_r17380899
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala
---
@@ -158,11 +159,18 @@ case class Subquery(alias: String, child:
LogicalPlan) extends UnaryNode {
* this allows for optional case insensitive attribute resolution. This
node can be elided after
* analysis.
*/
-case class LowerCaseSchema(child: LogicalPlan) extends UnaryNode {
+case class LowerCaseSchema(child: LogicalPlan) extends UnaryNode with
Logging {
protected def lowerCaseSchema(dataType: DataType): DataType = dataType
match {
case StructType(fields) =>
- StructType(fields.map(f =>
- StructField(f.name.toLowerCase(), lowerCaseSchema(f.dataType),
f.nullable)))
+ val convertedFields = fields.map(f =>
+ StructField(f.name.toLowerCase, lowerCaseSchema(f.dataType),
f.nullable))
+ val deduplicatedFields = convertedFields.groupBy(_.name).map {
--- End diff --
Ahh, this reorders the schema and breaks things. Props to @andyk.
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