Extend orderBy signature

querydsl-sql/src/main/java/com/querydsl/sql/WindowFirstLast.java

@@ -14,7 +14,7 @@
 package com.querydsl.sql;
 
 import java.util.ArrayList;
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 import javax.annotation.Nullable;
@@ -80,7 +80,7 @@ public class WindowFirstLast<T> extends MutableExpressionBase<T> {
 
     public WindowFirstLast<T> orderBy(OrderSpecifier<?>... orderBy) {
         value = null;
-        this.orderBy.addAll(Arrays.asList(orderBy));
+        Collections.addAll(this.orderBy, orderBy);
         return this;
     }
 

querydsl-sql/src/main/java/com/querydsl/sql/WindowFunction.java

@@ -14,7 +14,7 @@
 package com.querydsl.sql;
 
 import java.util.ArrayList;
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 import javax.annotation.Nullable;
@@ -167,7 +167,7 @@ public class WindowFunction<A> extends MutableExpressionBase<A> {
 
     public WindowFunction<A> orderBy(OrderSpecifier<?>... orderBy) {
         value = null;
-        this.orderBy.addAll(Arrays.asList(orderBy));
+        Collections.addAll(this.orderBy, orderBy);
         return this;
     }
 
@@ -179,7 +179,7 @@ public class WindowFunction<A> extends MutableExpressionBase<A> {
 
     public WindowFunction<A> partitionBy(Expression<?>... partitionBy) {
         value = null;
-        this.partitionBy.addAll(Arrays.asList(partitionBy));
+        Collections.addAll(this.partitionBy, partitionBy);
         return this;
     }
 

querydsl-sql/src/main/java/com/querydsl/sql/WithinGroup.java

@@ -14,6 +14,7 @@
 package com.querydsl.sql;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 import javax.annotation.Nullable;
@@ -100,6 +101,18 @@ public class WithinGroup<T> extends SimpleOperation<T> {
             }
             return this;
         }
+
+        public OrderBy orderBy(OrderSpecifier<?> orderBy) {
+            value = null;
+            this.orderBy.add(orderBy);
+            return this;
+        }
+
+        public OrderBy orderBy(OrderSpecifier<?>... orderBy) {
+            value = null;
+            Collections.addAll(this.orderBy, orderBy);
+            return this;
+        }
     }
 
     public WithinGroup(Class<? extends T> type, Operator op) {