diff --git a/flink-connector-hive/src/main/java/org/apache/flink/table/planner/delegation/hive/HiveParserRexNodeConverter.java b/flink-connector-hive/src/main/java/org/apache/flink/table/planner/delegation/hive/HiveParserRexNodeConverter.java
index 5c5f67aa6..375c6c3ba 100644
--- a/flink-connector-hive/src/main/java/org/apache/flink/table/planner/delegation/hive/HiveParserRexNodeConverter.java
+++ b/flink-connector-hive/src/main/java/org/apache/flink/table/planner/delegation/hive/HiveParserRexNodeConverter.java
@@ -211,7 +211,7 @@ public static RexNode convert(
 
     public RexNode convert(ExprNodeDesc expr) throws SemanticException {
         if (expr instanceof ExprNodeGenericFuncDesc) {
-            return convertGenericFunc((ExprNodeGenericFuncDesc) expr);
+            return convertGenericFunc((ExprNodeGenericFuncDesc) expr, cluster);
         } else if (expr instanceof ExprNodeConstantDesc) {
             return convertConstant((ExprNodeConstantDesc) expr, cluster);
         } else if (expr instanceof ExprNodeColumnDesc) {
@@ -518,13 +518,18 @@ public static RexNode convertConstant(ExprNodeConstantDesc literal, RelOptCluste
         return calciteLiteral;
     }
 
-    private RexNode convertGenericFunc(ExprNodeGenericFuncDesc func) throws SemanticException {
+    private RexNode convertGenericFunc(ExprNodeGenericFuncDesc func, RelOptCluster cluster) throws SemanticException {
         ExprNodeDesc tmpExprNode;
         RexNode tmpRN;
 
         List<RexNode> childRexNodeLst = new ArrayList<>();
         List<RelDataType> argTypes = new ArrayList<>();
 
+        ExprNodeDesc afterFoldDesc = ConstantPropagateProcFactory.foldExpr(func);
+        if (afterFoldDesc instanceof ExprNodeConstantDesc) {
+            return convertConstant((ExprNodeConstantDesc) afterFoldDesc, cluster);
+        }
+
         // TODO: 1) Expand to other functions as needed 2) What about types other than primitive.
         TypeInfo tgtDT = null;
         GenericUDF tgtUdf = func.getGenericUDF();
diff --git a/flink-connector-hive/src/test/resources/query-test/group_by.q b/flink-connector-hive/src/test/resources/query-test/group_by.q
index 28f2bc778..251e8cf2c 100644
--- a/flink-connector-hive/src/test/resources/query-test/group_by.q
+++ b/flink-connector-hive/src/test/resources/query-test/group_by.q
@@ -31,3 +31,7 @@ select dep,count(1) from employee where salary<5000 and age>=38 and dep='Sales'
 select x,null as n from foo group by x,'a',null;
 
 [+I[1, null], +I[2, null], +I[3, null], +I[4, null], +I[5, null]]
+
+select dep, sum(salary) from employee group by dep, UNIX_TIMESTAMP();
+
+[+I[Management, 12900], +I[Production, 18600], +I[Sales, 8400], +I[Service, 4100]]
\ No newline at end of file