Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/10218#discussion_r47201429
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -1271,10 +1271,11 @@ class DataFrame private[sql](
* @since 1.6.0
*/
@scala.annotation.varargs
- def drop(colNames: String*): DataFrame = {
+ def drop(colName: String, colNames: String*): DataFrame = {
--- End diff --
Just FYI, I am not too sure about all the versions but at least this works
fine at Java 7 and Scala 2.10.4.
- Scala
```scala
class TestCompatibility {
def test(a: String): Unit = {
test(a, Seq(): _ *)
}
@varargs
def test(a: String, b: String*): Unit = {
(a +: b).foreach(println)
}
def test(a: Int): Unit = {
test(Seq(a) : _ *)
}
@varargs
def test(a: Int*): Unit = {
a.foreach(println)
}
}
```
- Java
```java
public class Test {
public static void main(String[] args) {
new TestCompatibility().test("a");
new TestCompatibility().test("a", "b");
new TestCompatibility().test("a", "b", "c");
new TestCompatibility().test(1);
new TestCompatibility().test(1, 2);
new TestCompatibility().test(1, 2, 3);
}
}
```
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