diff --git a/query/src/main/java/org/apache/kylin/query/udf/ConcatUDF.java b/query/src/main/java/org/apache/kylin/query/udf/ConcatUDF.java
index 42946a2..61a2554 100644
--- a/query/src/main/java/org/apache/kylin/query/udf/ConcatUDF.java
+++ b/query/src/main/java/org/apache/kylin/query/udf/ConcatUDF.java
@@ -22,7 +22,7 @@
 
 public class ConcatUDF {
 
-    public String eval(@Parameter(name = "str1") String col1, @Parameter(name = "str2") String col2) {
+    public static String eval(@Parameter(name = "str1") String col1, @Parameter(name = "str2") String col2) {
         if (col1 == null) {
             return null;
         }
diff --git a/query/src/main/java/org/apache/kylin/query/udf/MassInUDF.java b/query/src/main/java/org/apache/kylin/query/udf/MassInUDF.java
index 596fa1e..12a3c64 100644
--- a/query/src/main/java/org/apache/kylin/query/udf/MassInUDF.java
+++ b/query/src/main/java/org/apache/kylin/query/udf/MassInUDF.java
@@ -22,7 +22,7 @@
 
 public class MassInUDF {
 
-    public boolean eval(@Parameter(name = "col") Object col, @Parameter(name = "filterTable") String filterTable) {
+    public static boolean eval(@Parameter(name = "col") Object col, @Parameter(name = "filterTable") String filterTable) {
         return true;
     }
 }
diff --git a/query/src/main/java/org/apache/kylin/query/udf/VersionUDF.java b/query/src/main/java/org/apache/kylin/query/udf/VersionUDF.java
index cbd0f22..ca975f4 100644
--- a/query/src/main/java/org/apache/kylin/query/udf/VersionUDF.java
+++ b/query/src/main/java/org/apache/kylin/query/udf/VersionUDF.java
@@ -21,7 +21,7 @@
 import org.apache.kylin.common.KylinVersion;
 
 public class VersionUDF {
-    public String eval() {
+    public static String eval() {
         return KylinVersion.getCurrentVersion().toString();
     }
 }