[SPARK-20260][MLLIB] String interpolation required for error message

## What changes were proposed in this pull request?
This error message doesn't get properly formatted because of a missing `s`.  Currently the error looks like:

```
Caused by: java.lang.IllegalArgumentException: requirement failed: indices should be one-based and in ascending order; found current=$current, previous=$previous; line="$line"
```
(note the literal `$current` instead of the interpolated value)

Please review http://spark.apache.org/contributing.html before opening a pull request.

Author: Vijay Ramesh <vramesh@demandbase.com>

Closes #17572 from vijaykramesh/master.

1 files changed, 3 insertions, 3 deletions

diff --git a/sql/hive/src/test/scala/org/apache/spark/sql/hive/orc/OrcQuerySuite.scala b/sql/hive/src/test/scala/org/apache/spark/sql/hive/orc/OrcQuerySuite.scala
index 5d8ba9d7c8..8c855730c3 100644
--- a/sql/hive/src/test/scala/org/apache/spark/sql/hive/orc/OrcQuerySuite.scala
+++ b/sql/hive/src/test/scala/org/apache/spark/sql/hive/orc/OrcQuerySuite.scala
@@ -285,7 +285,7 @@ class OrcQuerySuite extends QueryTest with BeforeAndAfterAll with OrcTest {
       val queryOutput = selfJoin.queryExecution.analyzed.output
 
       assertResult(4, "Field count mismatches")(queryOutput.size)
-      assertResult(2, "Duplicated expression ID in query plan:\n $selfJoin") {
+      assertResult(2, s"Duplicated expression ID in query plan:\n $selfJoin") {
         queryOutput.filter(_.name == "_1").map(_.exprId).size
       }
 
@@ -294,7 +294,7 @@ class OrcQuerySuite extends QueryTest with BeforeAndAfterAll with OrcTest {
   }
 
   test("nested data - struct with array field") {
-    val data = (1 to 10).map(i => Tuple1((i, Seq("val_$i"))))
+    val data = (1 to 10).map(i => Tuple1((i, Seq(s"val_$i"))))
     withOrcTable(data, "t") {
       checkAnswer(sql("SELECT `_1`.`_2`[0] FROM t"), data.map {
         case Tuple1((_, Seq(string))) => Row(string)
@@ -303,7 +303,7 @@ class OrcQuerySuite extends QueryTest with BeforeAndAfterAll with OrcTest {
   }
 
   test("nested data - array of struct") {
-    val data = (1 to 10).map(i => Tuple1(Seq(i -> "val_$i")))
+    val data = (1 to 10).map(i => Tuple1(Seq(i -> s"val_$i")))
     withOrcTable(data, "t") {
       checkAnswer(sql("SELECT `_1`[0].`_2` FROM t"), data.map {
         case Tuple1(Seq((_, string))) => Row(string)