添加Argument构造函数

gjjs-bd-runtime/src/main/java/com/brilliance/mda/runtime/mda/impl/Argument.java

 package com.brilliance.mda.runtime.mda.impl;
 
+import com.brilliance.mda.runtime.mda.IDatafield;
 import com.brilliance.mda.runtime.mda.IResult;
 import com.brilliance.mda.runtime.mda.OpType;
 
@@ -23,6 +24,10 @@ public class Argument<E> implements IResult {
         this.value = value;
     }
 
+    public Argument(String fieldName, IDatafield<E> iDatafield) {
+        this(fieldName, OpType.EQ, iDatafield.getValue());
+    }
+
     public Argument(String fieldName, OpType opType) {
         this.fieldName = fieldName;
         this.opType = opType;