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src/main/java/com/alibaba/qlexpress4/exception/UserDefineException.java

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+package com.alibaba.qlexpress4.exception;
+
+/**
+ * user define error message for custom function/operator
+ * Author: DQinYuan
+ */
+public class UserDefineException extends Exception {
+    
+    public enum ExceptionType {
+        INVALID_ARGUMENT, BIZ_EXCEPTION
+    };
+    
+    private final ExceptionType type;
+    
+    public UserDefineException(String message) {
+        this(ExceptionType.BIZ_EXCEPTION, message);
+    }
+    
+    public UserDefineException(ExceptionType type, String message) {
+        super(message);
+        this.type = type;
+    }
+    
+    public ExceptionType getType() {
+        return type;
+    }
+}