added delegating methods for NumberExpression statics to MathExpressions

querydsl-collections/src/test/java/com/mysema/query/collections/CollectionTest.java

@@ -19,6 +19,7 @@ import java.util.Arrays;
 import java.util.List;
 
 import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Test;
 
 public class CollectionTest {

querydsl-core/src/main/java/com/mysema/query/types/expr/MathExpressions.java

@@ -46,7 +46,7 @@ public final class MathExpressions {
     public static <A extends Number & Comparable<?>> NumberExpression<Double> atan(Expression<A> num) {
         return NumberOperation.create(Double.class, Ops.MathOps.ATAN, num);
     }
-
+    
     /**
      * @param num
      * @return cos(num)
@@ -112,6 +112,24 @@ public final class MathExpressions {
         return NumberOperation.create(Double.class, Ops.MathOps.LOG, num, ConstantImpl.create(base));
     }
 
+    /**
+     * Return the greater of the given values
+     *
+     * @return max(left, right)
+     */
+    public static <A extends Number & Comparable<?>> NumberExpression<A> max(Expression<A> left, Expression<A> right) {
+        return NumberExpression.max(left, right);
+    }
+
+    /**
+     * Return the smaller of the given values
+     *
+     * @return min(left, right)
+     */
+    public static <A extends Number & Comparable<?>> NumberExpression<A> min(Expression<A> left, Expression<A> right) {
+        return NumberExpression.min(left, right);
+    }
+
     /**
      * @param num
      * @param exponent
@@ -129,6 +147,14 @@ public final class MathExpressions {
         return NumberOperation.create(Double.class, Ops.MathOps.RAD, num);
     }
 
+    /**
+     * Returns the random expression
+     * @return random()
+     */
+    public static NumberExpression<Double> random(){
+        return NumberExpression.random();
+    }
+
     /**
      * @param num
      * @return sign(num)