diff --git a/asterixdb/asterix-om/src/main/java/org/apache/asterix/om/utils/ConstantExpressionUtil.java b/asterixdb/asterix-om/src/main/java/org/apache/asterix/om/utils/ConstantExpressionUtil.java
index 7c7813d..cc05183 100644
--- a/asterixdb/asterix-om/src/main/java/org/apache/asterix/om/utils/ConstantExpressionUtil.java
+++ b/asterixdb/asterix-om/src/main/java/org/apache/asterix/om/utils/ConstantExpressionUtil.java
@@ -98,6 +98,10 @@
         return getIntConstant(f.getArguments().get(index).getValue());
     }
 
+    public static Long getLongArgument(AbstractFunctionCallExpression f, int index) {
+        return getLongConstant(f.getArguments().get(index).getValue());
+    }
+
     public static String getStringArgument(AbstractFunctionCallExpression f, int index) {
         return getStringConstant(f.getArguments().get(index).getValue());
     }
diff --git a/hyracks-fullstack/hyracks/hyracks-util/src/main/java/org/apache/hyracks/util/IDelay.java b/hyracks-fullstack/hyracks/hyracks-util/src/main/java/org/apache/hyracks/util/IDelay.java
index b266f01..4ce70b6 100644
--- a/hyracks-fullstack/hyracks/hyracks-util/src/main/java/org/apache/hyracks/util/IDelay.java
+++ b/hyracks-fullstack/hyracks/hyracks-util/src/main/java/org/apache/hyracks/util/IDelay.java
@@ -21,6 +21,10 @@
 @FunctionalInterface
 public interface IDelay {
 
+    /**
+     * @param attempt
+     * @return the delay before next attempt in milliseconds
+     */
     long calculate(long attempt);
 
 }