diff --git a/connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/ClientE2ETestSuite.scala b/connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/ClientE2ETestSuite.scala
index 11e28f538e89..eaca79e961d6 100644
--- a/connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/ClientE2ETestSuite.scala
+++ b/connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/ClientE2ETestSuite.scala
@@ -76,7 +76,7 @@ class ClientE2ETestSuite extends RemoteSparkSession {
     assert(result(2) == 2)
   }
 
-  test("simple udf") {
+  ignore("SPARK-42665: Ignore simple udf test until the udf is fully implemented.") {
     def dummyUdf(x: Int): Int = x + 5
     val myUdf = udf(dummyUdf _)
     val df = spark.range(5).select(myUdf(Column("id")))