diff --git a/gluten-core/src/main/scala/io/glutenproject/expression/ExpressionMappings.scala b/gluten-core/src/main/scala/io/glutenproject/expression/ExpressionMappings.scala
index a388a9e02538..4cc0349606eb 100644
--- a/gluten-core/src/main/scala/io/glutenproject/expression/ExpressionMappings.scala
+++ b/gluten-core/src/main/scala/io/glutenproject/expression/ExpressionMappings.scala
@@ -25,7 +25,6 @@ import org.apache.spark.sql.catalyst.expressions._
 import org.apache.spark.sql.catalyst.expressions.aggregate._
 import org.apache.spark.sql.catalyst.optimizer.NormalizeNaNAndZero
 import org.apache.spark.sql.execution.ScalarSubquery
-import org.apache.spark.sql.execution.datasources.FileFormatWriter.Empty2Null
 
 object ExpressionMappings {
 
@@ -88,7 +87,6 @@ object ExpressionMappings {
     Sig[StringRepeat](REPEAT),
     Sig[StringTranslate](TRANSLATE),
     Sig[StringSpace](SPACE),
-    Sig[Empty2Null](EMPTY2NULL),
     Sig[InitCap](INITCAP),
     Sig[Overlay](OVERLAY),
     Sig[Conv](CONV),
diff --git a/shims/spark32/src/main/scala/io/glutenproject/sql/shims/spark32/Spark32Shims.scala b/shims/spark32/src/main/scala/io/glutenproject/sql/shims/spark32/Spark32Shims.scala
index 1cacc2f75be9..580cc93bdf75 100644
--- a/shims/spark32/src/main/scala/io/glutenproject/sql/shims/spark32/Spark32Shims.scala
+++ b/shims/spark32/src/main/scala/io/glutenproject/sql/shims/spark32/Spark32Shims.scala
@@ -16,7 +16,7 @@
  */
 package io.glutenproject.sql.shims.spark32
 
-import io.glutenproject.expression.Sig
+import io.glutenproject.expression.{ExpressionNames, Sig}
 import io.glutenproject.sql.shims.{ShimDescriptor, SparkShims}
 
 import org.apache.spark.sql.SparkSession
@@ -28,6 +28,7 @@ import org.apache.spark.sql.connector.catalog.Table
 import org.apache.spark.sql.connector.expressions.Transform
 import org.apache.spark.sql.execution.{FileSourceScanExec, PartitionedFileUtil}
 import org.apache.spark.sql.execution.datasources.{BucketingUtils, FilePartition, FileScanRDD, PartitionDirectory, PartitionedFile, PartitioningAwareFileIndex}
+import org.apache.spark.sql.execution.datasources.FileFormatWriter.Empty2Null
 import org.apache.spark.sql.execution.datasources.v2.BatchScanExec
 import org.apache.spark.sql.execution.datasources.v2.text.TextScan
 import org.apache.spark.sql.execution.datasources.v2.utils.CatalogUtil
@@ -43,7 +44,7 @@ class Spark32Shims extends SparkShims {
     HashClusteredDistribution(leftKeys) :: HashClusteredDistribution(rightKeys) :: Nil
   }
 
-  override def expressionMappings: Seq[Sig] = Seq.empty
+  override def expressionMappings: Seq[Sig] = Seq(Sig[Empty2Null](ExpressionNames.EMPTY2NULL))
 
   override def convertPartitionTransforms(
       partitions: Seq[Transform]): (Seq[String], Option[BucketSpec]) = {
diff --git a/shims/spark33/src/main/scala/io/glutenproject/sql/shims/spark33/Spark33Shims.scala b/shims/spark33/src/main/scala/io/glutenproject/sql/shims/spark33/Spark33Shims.scala
index b593b6da7066..50e536610e7b 100644
--- a/shims/spark33/src/main/scala/io/glutenproject/sql/shims/spark33/Spark33Shims.scala
+++ b/shims/spark33/src/main/scala/io/glutenproject/sql/shims/spark33/Spark33Shims.scala
@@ -31,6 +31,7 @@ import org.apache.spark.sql.connector.catalog.Table
 import org.apache.spark.sql.connector.expressions.Transform
 import org.apache.spark.sql.execution.{FileSourceScanExec, PartitionedFileUtil, SparkPlan}
 import org.apache.spark.sql.execution.datasources.{BucketingUtils, FilePartition, FileScanRDD, PartitionDirectory, PartitionedFile, PartitioningAwareFileIndex}
+import org.apache.spark.sql.execution.datasources.FileFormatWriter.Empty2Null
 import org.apache.spark.sql.execution.datasources.v2.BatchScanExec
 import org.apache.spark.sql.execution.datasources.v2.text.TextScan
 import org.apache.spark.sql.execution.datasources.v2.utils.CatalogUtil
@@ -57,7 +58,8 @@ class Spark33Shims extends SparkShims {
     list ++ Seq(
       Sig[SplitPart](ExpressionNames.SPLIT_PART),
       Sig[Sec](ExpressionNames.SEC),
-      Sig[Csc](ExpressionNames.CSC))
+      Sig[Csc](ExpressionNames.CSC),
+      Sig[Empty2Null](ExpressionNames.EMPTY2NULL))
   }
 
   override def convertPartitionTransforms(
diff --git a/shims/spark34/src/main/scala/io/glutenproject/sql/shims/spark34/Spark34Shims.scala b/shims/spark34/src/main/scala/io/glutenproject/sql/shims/spark34/Spark34Shims.scala
index fbaf04cbc7c2..cdc42f3b43fd 100644
--- a/shims/spark34/src/main/scala/io/glutenproject/sql/shims/spark34/Spark34Shims.scala
+++ b/shims/spark34/src/main/scala/io/glutenproject/sql/shims/spark34/Spark34Shims.scala
@@ -18,6 +18,7 @@ package io.glutenproject.sql.shims.spark34
 
 import io.glutenproject.GlutenConfig
 import io.glutenproject.expression.{ExpressionNames, Sig}
+import io.glutenproject.expression.ExpressionNames.EMPTY2NULL
 import io.glutenproject.sql.shims.{ShimDescriptor, SparkShims}
 
 import org.apache.spark.SparkException
@@ -59,7 +60,9 @@ class Spark34Shims extends SparkShims {
     list ++ Seq(
       Sig[SplitPart](ExpressionNames.SPLIT_PART),
       Sig[Sec](ExpressionNames.SEC),
-      Sig[Csc](ExpressionNames.CSC))
+      Sig[Csc](ExpressionNames.CSC),
+      Sig[Empty2Null](ExpressionNames.EMPTY2NULL))
+
   }
 
   override def convertPartitionTransforms(
diff --git a/shims/spark34/src/main/scala/org/apache/spark/sql/execution/datasources/FileFormatWriter.scala b/shims/spark34/src/main/scala/org/apache/spark/sql/execution/datasources/FileFormatWriter.scala
index 65215f379d77..cbdf13159c08 100644
--- a/shims/spark34/src/main/scala/org/apache/spark/sql/execution/datasources/FileFormatWriter.scala
+++ b/shims/spark34/src/main/scala/org/apache/spark/sql/execution/datasources/FileFormatWriter.scala
@@ -53,28 +53,6 @@ object FileFormatWriter extends Logging {
       customPartitionLocations: Map[TablePartitionSpec, String],
       outputColumns: Seq[Attribute])
 
-  case class Empty2Null(child: Expression) extends UnaryExpression with String2StringExpression {
-    override def convert(v: UTF8String): UTF8String = if (v.numBytes() == 0) null else v
-    override def nullable: Boolean = true
-    override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
-      nullSafeCodeGen(
-        ctx,
-        ev,
-        c => {
-          s"""if ($c.numBytes() == 0) {
-             |  ${ev.isNull} = true;
-             |  ${ev.value} = null;
-             |} else {
-             |  ${ev.value} = $c;
-             |}""".stripMargin
-        }
-      )
-    }
-
-    override protected def withNewChildInternal(newChild: Expression): Empty2Null =
-      copy(child = newChild)
-  }
-
   /** Describes how concurrent output writers should be executed. */
   case class ConcurrentOutputWriterSpec(
       maxWriters: Int,