Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/22553#discussion_r220718383
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/CaseInsensitiveMap.scala
---
@@ -42,7 +42,11 @@ class CaseInsensitiveMap[T] private (val originalMap:
Map[String, T]) extends Ma
override def iterator: Iterator[(String, T)] = keyLowerCasedMap.iterator
override def -(key: String): Map[String, T] = {
- new
CaseInsensitiveMap(originalMap.filterKeys(!_.equalsIgnoreCase(key)))
+ new CaseInsensitiveMap(originalMap.filter(!_._1.equalsIgnoreCase(key)))
+ }
+
+ override def filterKeys(p: (String) => Boolean): Map[String, T] = {
--- End diff --
This method right now doesn't follow the Scaladoc:
```
* @return an immutable map consisting only of those key value pairs of
this map where the key satisfies
* the predicate `p`. The resulting map wraps the original map
without copying any elements.
```
Maybe we should not add it.
This is a Scala issue but they didn't fix in until 2.13
(https://github.com/scala/bug/issues/4776).
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