diff --git a/integration_tests/src/main/python/udf_test.py b/integration_tests/src/main/python/udf_test.py
index b7b6573ab14..19a3c9f4c9a 100644
--- a/integration_tests/src/main/python/udf_test.py
+++ b/integration_tests/src/main/python/udf_test.py
@@ -15,6 +15,7 @@
 import pytest
 
 from conftest import is_at_least_precommit_run
+from spark_session import is_databricks91_or_later
 
 from pyspark.sql.pandas.utils import require_minimum_pyarrow_version, require_minimum_pandas_version
 try:
@@ -212,6 +213,7 @@ def pandas_sum(to_process: pd.Series) -> list:
 
 
 # ======= Test flat map group in Pandas =======
+@pytest.mark.skipif(is_databricks91_or_later(), reason="https://github.com/NVIDIA/spark-rapids/issues/4599")
 @ignore_order
 @pytest.mark.parametrize('data_gen', [LongGen()], ids=idfn)
 def test_group_apply_udf(data_gen):
@@ -226,6 +228,7 @@ def pandas_add(data):
             conf=arrow_udf_conf)
 
 
+@pytest.mark.skipif(is_databricks91_or_later(), reason="https://github.com/NVIDIA/spark-rapids/issues/4599")
 @ignore_order
 @pytest.mark.parametrize('data_gen', arrow_common_gen, ids=idfn)
 def test_group_apply_udf_more_types(data_gen):
diff --git a/sql-plugin/src/main/scala/com/nvidia/spark/rapids/GpuOverrides.scala b/sql-plugin/src/main/scala/com/nvidia/spark/rapids/GpuOverrides.scala
index 345a0e03edd..2b6cc3250c1 100644
--- a/sql-plugin/src/main/scala/com/nvidia/spark/rapids/GpuOverrides.scala
+++ b/sql-plugin/src/main/scala/com/nvidia/spark/rapids/GpuOverrides.scala
@@ -497,21 +497,6 @@ object GpuOverrides extends Logging {
     !regexList.exists(pattern => s.contains(pattern))
   }
 
-  private def convertExprToGpuIfPossible(expr: Expression, conf: RapidsConf): Expression = {
-    if (expr.find(_.isInstanceOf[GpuExpression]).isDefined) {
-      // already been converted
-      expr
-    } else {
-      val wrapped = wrapExpr(expr, conf, None)
-      wrapped.tagForGpu()
-      if (wrapped.canExprTreeBeReplaced) {
-        wrapped.convertToGpu()
-      } else {
-        expr
-      }
-    }
-  }
-
   private def convertPartToGpuIfPossible(part: Partitioning, conf: RapidsConf): Partitioning = {
     part match {
       case _: GpuPartitioning => part
@@ -910,7 +895,6 @@ object GpuOverrides extends Logging {
         private[this] def extractOrigParam(expr: BaseExprMeta[_]): BaseExprMeta[_] =
           expr.wrapped match {
             case lit: Literal if lit.dataType.isInstanceOf[DecimalType] =>
-              val dt = lit.dataType.asInstanceOf[DecimalType]
               // Lets figure out if we can make the Literal value smaller
               val (newType, value) = lit.value match {
                 case null =>
@@ -930,8 +914,10 @@ object GpuOverrides extends Logging {
                   throw new IllegalArgumentException(s"Unexpected decimal literal value $other")
               }
               expr.asInstanceOf[LiteralExprMeta].withNewLiteral(Literal(value, newType))
-            // We avoid unapply for Cast because it changes between versions of Spark
-            case PromotePrecision(c: CastBase) if c.dataType.isInstanceOf[DecimalType] =>
+            // Avoid unapply for PromotePrecision and Cast because it changes between Spark versions
+            case p: PromotePrecision if p.child.isInstanceOf[CastBase] &&
+                p.child.dataType.isInstanceOf[DecimalType] =>
+              val c = p.child.asInstanceOf[CastBase]
               val to = c.dataType.asInstanceOf[DecimalType]
               val fromType = DecimalUtil.optionallyAsDecimalType(c.child.dataType)
               fromType match {