diff --git a/kylin-spark-project/kylin-spark-engine/src/main/scala/org/apache/kylin/query/runtime/ExpressionConverter.scala b/kylin-spark-project/kylin-spark-engine/src/main/scala/org/apache/kylin/query/runtime/ExpressionConverter.scala
index a08affe6054..13ae14bdaf9 100644
--- a/kylin-spark-project/kylin-spark-engine/src/main/scala/org/apache/kylin/query/runtime/ExpressionConverter.scala
+++ b/kylin-spark-project/kylin-spark-engine/src/main/scala/org/apache/kylin/query/runtime/ExpressionConverter.scala
@@ -173,8 +173,8 @@ object ExpressionConverter {
           case "character_length" => length(k_lit(children.head))
           case "replace" =>
             regexp_replace(k_lit(children.head),
-              children.apply(1).asInstanceOf[String],
-              children.apply(2).asInstanceOf[String])
+              k_lit(children.apply(1)),
+              k_lit(children.apply(2)))
           case "substring" | "substr" =>
             if (children.length == 3) { //substr(str1,startPos,length)
               k_lit(children.head)
diff --git a/kylin-spark-project/kylin-spark-query/src/main/scala/org/apache/kylin/query/runtime/ExpressionConverter.scala b/kylin-spark-project/kylin-spark-query/src/main/scala/org/apache/kylin/query/runtime/ExpressionConverter.scala
index 764807d48f1..9301ff7d704 100644
--- a/kylin-spark-project/kylin-spark-query/src/main/scala/org/apache/kylin/query/runtime/ExpressionConverter.scala
+++ b/kylin-spark-project/kylin-spark-query/src/main/scala/org/apache/kylin/query/runtime/ExpressionConverter.scala
@@ -173,10 +173,10 @@ object ExpressionConverter {
           case "upper" => upper(k_lit(children.head))
           case "char_length" => length(k_lit(children.head))
           case "character_length" => length(k_lit(children.head))
-          case "replace " =>
+          case "replace" =>
             regexp_replace(k_lit(children.head),
-              children.apply(1).asInstanceOf[String],
-              children.apply(2).asInstanceOf[String])
+              k_lit(children.apply(1)),
+              k_lit(children.apply(2)))
           case "substring" | "substr" =>
             if (children.length == 3) { //substr(str1,startPos,length)
               k_lit(children.head)