[SPARK-18300][SQL] Fix scala 2.10 build for FoldablePropagation

## What changes were proposed in this pull request?
Commit https://github.com/apache/spark/commit/f14ae4900ad0ed66ba36108b7792d56cd6767a69

 broke the scala 2.10 build. This PR fixes this by simplifying the used pattern match.

## How was this patch tested?
Tested building manually. Ran `build/sbt -Dscala-2.10 -Pscala-2.10 package`.

Author: Herman van Hovell <hvanhovell@databricks.com>

Closes #15891 from hvanhovell/SPARK-18300-scala-2.10.

(cherry picked from commit 4b35d13b)
Signed-off-by: Shixiong Zhu <shixiong@databricks.com>

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala

@@ -442,12 +442,9 @@ object FoldablePropagation extends Rule[LogicalPlan] {
         case l: LeafNode =>
           l
 
-        // Whitelist of all nodes we are allowed to apply this rule to.
-        case p @ (_: Project | _: Filter | _: SubqueryAlias | _: Aggregate | _: Window |
-                  _: Sample | _: GlobalLimit | _: LocalLimit | _: Generate | _: Distinct |
-                  _: AppendColumns | _: AppendColumnsWithObject | _: BroadcastHint |
-                  _: RedistributeData | _: Repartition | _: Sort | _: TypedFilter) if !stop =>
-          p.transformExpressions(replaceFoldable)
+        // We can only propagate foldables for a subset of unary nodes.
+        case u: UnaryNode if !stop && canPropagateFoldables(u) =>
+          u.transformExpressions(replaceFoldable)
 
         // Allow inner joins. We do not allow outer join, although its output attributes are
         // derived from its children, they are actually different attributes: the output of outer
@@ -474,6 +471,30 @@ object FoldablePropagation extends Rule[LogicalPlan] {
       })
     }
   }
+
+  /**
+   * Whitelist of all [[UnaryNode]]s for which allow foldable propagation.
+   */
+  private def canPropagateFoldables(u: UnaryNode): Boolean = u match {
+    case _: Project => true
+    case _: Filter => true
+    case _: SubqueryAlias => true
+    case _: Aggregate => true
+    case _: Window => true
+    case _: Sample => true
+    case _: GlobalLimit => true
+    case _: LocalLimit => true
+    case _: Generate => true
+    case _: Distinct => true
+    case _: AppendColumns => true
+    case _: AppendColumnsWithObject => true
+    case _: BroadcastHint => true
+    case _: RedistributeData => true
+    case _: Repartition => true
+    case _: Sort => true
+    case _: TypedFilter => true
+    case _ => false
+  }
 }