Polishing.

Removes code duplication.

Original pull request #1348

Author: schauder

spring-data-relational/src/main/java/org/springframework/data/relational/core/sql/render/OrderByClauseVisitor.java

@@ -77,6 +77,7 @@ Delegation leaveMatched(OrderByField segment) {
 
 	@Override
 	Delegation enterNested(Visitable segment) {
+
 		if (segment instanceof SimpleFunction) {
 			delegate = new SimpleFunctionVisitor(context);
 			return Delegation.delegateTo((SimpleFunctionVisitor)delegate);
@@ -92,12 +93,8 @@ Delegation enterNested(Visitable segment) {
 
 	@Override
 	Delegation leaveNested(Visitable segment) {
-		if (delegate instanceof SimpleFunctionVisitor) {
-			builder.append(delegate.getRenderedPart());
-			delegate = null;
-		}
 
-		if (delegate instanceof ExpressionVisitor) {
+		if (delegate instanceof SimpleFunctionVisitor || delegate instanceof ExpressionVisitor) {
 			builder.append(delegate.getRenderedPart());
 			delegate = null;
 		}