diff --git a/datafusion/physical-expr/src/expressions/is_not_null.rs b/datafusion/physical-expr/src/expressions/is_not_null.rs
index 58559352d44c..cbab7d0c9d1f 100644
--- a/datafusion/physical-expr/src/expressions/is_not_null.rs
+++ b/datafusion/physical-expr/src/expressions/is_not_null.rs
@@ -73,7 +73,7 @@ impl PhysicalExpr for IsNotNullExpr {
         let arg = self.arg.evaluate(batch)?;
         match arg {
             ColumnarValue::Array(array) => {
-                let is_not_null = super::is_null::compute_is_not_null(array)?;
+                let is_not_null = arrow::compute::is_not_null(&array)?;
                 Ok(ColumnarValue::Array(Arc::new(is_not_null)))
             }
             ColumnarValue::Scalar(scalar) => Ok(ColumnarValue::Scalar(
diff --git a/datafusion/physical-expr/src/expressions/is_null.rs b/datafusion/physical-expr/src/expressions/is_null.rs
index 3cdb49bcab42..1c8597d3fdea 100644
--- a/datafusion/physical-expr/src/expressions/is_null.rs
+++ b/datafusion/physical-expr/src/expressions/is_null.rs
@@ -20,14 +20,10 @@
 use std::hash::{Hash, Hasher};
 use std::{any::Any, sync::Arc};
 
-use arrow::compute;
 use arrow::{
     datatypes::{DataType, Schema},
     record_batch::RecordBatch,
 };
-use arrow_array::{Array, ArrayRef, BooleanArray, Int8Array, UnionArray};
-use arrow_buffer::{BooleanBuffer, ScalarBuffer};
-use arrow_ord::cmp;
 
 use crate::physical_expr::down_cast_any_ref;
 use crate::PhysicalExpr;
@@ -77,9 +73,9 @@ impl PhysicalExpr for IsNullExpr {
     fn evaluate(&self, batch: &RecordBatch) -> Result<ColumnarValue> {
         let arg = self.arg.evaluate(batch)?;
         match arg {
-            ColumnarValue::Array(array) => {
-                Ok(ColumnarValue::Array(Arc::new(compute_is_null(array)?)))
-            }
+            ColumnarValue::Array(array) => Ok(ColumnarValue::Array(Arc::new(
+                arrow::compute::is_null(&array)?,
+            ))),
             ColumnarValue::Scalar(scalar) => Ok(ColumnarValue::Scalar(
                 ScalarValue::Boolean(Some(scalar.is_null())),
             )),
@@ -103,65 +99,6 @@ impl PhysicalExpr for IsNullExpr {
     }
 }
 
-/// workaround <https://github.com/apache/arrow-rs/issues/6017>,
-/// this can be replaced with a direct call to `arrow::compute::is_null` once it's fixed.
-pub(crate) fn compute_is_null(array: ArrayRef) -> Result<BooleanArray> {
-    if let Some(union_array) = array.as_any().downcast_ref::<UnionArray>() {
-        if let Some(offsets) = union_array.offsets() {
-            dense_union_is_null(union_array, offsets)
-        } else {
-            sparse_union_is_null(union_array)
-        }
-    } else {
-        compute::is_null(array.as_ref()).map_err(Into::into)
-    }
-}
-
-/// workaround <https://github.com/apache/arrow-rs/issues/6017>,
-/// this can be replaced with a direct call to `arrow::compute::is_not_null` once it's fixed.
-pub(crate) fn compute_is_not_null(array: ArrayRef) -> Result<BooleanArray> {
-    if array.as_any().is::<UnionArray>() {
-        compute::not(&compute_is_null(array)?).map_err(Into::into)
-    } else {
-        compute::is_not_null(array.as_ref()).map_err(Into::into)
-    }
-}
-
-fn dense_union_is_null(
-    union_array: &UnionArray,
-    offsets: &ScalarBuffer<i32>,
-) -> Result<BooleanArray> {
-    let child_arrays = (0..union_array.type_names().len())
-        .map(|type_id| {
-            compute::is_null(&union_array.child(type_id as i8)).map_err(Into::into)
-        })
-        .collect::<Result<Vec<BooleanArray>>>()?;
-
-    let buffer: BooleanBuffer = offsets
-        .iter()
-        .zip(union_array.type_ids())
-        .map(|(offset, type_id)| child_arrays[*type_id as usize].value(*offset as usize))
-        .collect();
-
-    Ok(BooleanArray::new(buffer, None))
-}
-
-fn sparse_union_is_null(union_array: &UnionArray) -> Result<BooleanArray> {
-    let type_ids = Int8Array::new(union_array.type_ids().clone(), None);
-
-    let mut union_is_null =
-        BooleanArray::new(BooleanBuffer::new_unset(union_array.len()), None);
-    for type_id in 0..union_array.type_names().len() {
-        let type_id = type_id as i8;
-        let union_is_child = cmp::eq(&type_ids, &Int8Array::new_scalar(type_id))?;
-        let child = union_array.child(type_id);
-        let child_array_is_null = compute::is_null(&child)?;
-        let child_is_null = compute::and(&union_is_child, &child_array_is_null)?;
-        union_is_null = compute::or(&union_is_null, &child_is_null)?;
-    }
-    Ok(union_is_null)
-}
-
 impl PartialEq<dyn Any> for IsNullExpr {
     fn eq(&self, other: &dyn Any) -> bool {
         down_cast_any_ref(other)
@@ -184,7 +121,7 @@ mod tests {
         array::{BooleanArray, StringArray},
         datatypes::*,
     };
-    use arrow_array::{Float64Array, Int32Array};
+    use arrow_array::{Array, Float64Array, Int32Array, UnionArray};
     use arrow_buffer::ScalarBuffer;
     use datafusion_common::cast::as_boolean_array;
 
@@ -243,8 +180,7 @@ mod tests {
         let array =
             UnionArray::try_new(union_fields(), type_ids, None, children).unwrap();
 
-        let array_ref = Arc::new(array) as ArrayRef;
-        let result = compute_is_null(array_ref).unwrap();
+        let result = arrow::compute::is_null(&array).unwrap();
 
         let expected =
             &BooleanArray::from(vec![false, true, false, false, true, true, false]);
@@ -272,8 +208,7 @@ mod tests {
             UnionArray::try_new(union_fields(), type_ids, Some(offsets), children)
                 .unwrap();
 
-        let array_ref = Arc::new(array) as ArrayRef;
-        let result = compute_is_null(array_ref).unwrap();
+        let result = arrow::compute::is_null(&array).unwrap();
 
         let expected = &BooleanArray::from(vec![false, true, false, true, false, true]);
         assert_eq!(expected, &result);