Github user clockfly commented on a diff in the pull request:
https://github.com/apache/spark/pull/14773#discussion_r77294893
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/ddl.scala ---
@@ -90,17 +90,31 @@ case class RefreshResource(path: String)
/**
* Builds a map in which keys are case insensitive
*/
-class CaseInsensitiveMap(map: Map[String, String]) extends Map[String,
String]
+class CaseInsensitiveMap[T] private(baseMap: Map[String, T]) extends
Map[String, T]
with Serializable {
- val baseMap = map.map(kv => kv.copy(_1 = kv._1.toLowerCase))
+ override def get(k: String): Option[T] = baseMap.get(k.toLowerCase)
- override def get(k: String): Option[String] = baseMap.get(k.toLowerCase)
+ override def + [B1 >: T](kv: (String, B1)): Map[String, B1] =
+ new CaseInsensitiveMap(baseMap + kv.copy(_1 = kv._1.toLowerCase))
- override def + [B1 >: String](kv: (String, B1)): Map[String, B1] =
- baseMap + kv.copy(_1 = kv._1.toLowerCase)
+ override def iterator: Iterator[(String, T)] = baseMap.iterator
- override def iterator: Iterator[(String, String)] = baseMap.iterator
+ override def -(key: String): Map[String, T] =
+ new CaseInsensitiveMap(baseMap - key.toLowerCase)
+}
- override def -(key: String): Map[String, String] = baseMap -
key.toLowerCase
+object CaseInsensitiveMap {
+ def apply[T](map: Map[String, T]): CaseInsensitiveMap[T] = {
+ val lowercaseKeys = map.keys.map(_.toLowerCase)
+ if (lowercaseKeys.toSet.size != map.size) {
+ val duplicatedKeys = lowercaseKeys.groupBy(identity).collect {
+ case (x, ys) if ys.size > 1 => x
+ }
+ throw new AnalysisException(
--- End diff --
Why it is a AnalysisException? This class is only supposed to be used at
driver?
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