diff --git a/sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/OffHeapColumnVector.java b/sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/OffHeapColumnVector.java
index 0ec256967bed7..35682756ed6c3 100644
--- a/sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/OffHeapColumnVector.java
+++ b/sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/OffHeapColumnVector.java
@@ -64,8 +64,6 @@ public static OffHeapColumnVector[] allocateColumns(int capacity, StructField[]
   public OffHeapColumnVector(int capacity, DataType type) {
     super(capacity, type);
 
-    initialize();
-
     nulls = 0;
     data = 0;
     lengthData = 0;
diff --git a/sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/OnHeapColumnVector.java b/sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/OnHeapColumnVector.java
index 288a15f74abcf..96a452978cb35 100644
--- a/sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/OnHeapColumnVector.java
+++ b/sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/OnHeapColumnVector.java
@@ -74,7 +74,7 @@ public static OnHeapColumnVector[] allocateColumns(int capacity, StructField[] f
 
   public OnHeapColumnVector(int capacity, DataType type) {
     super(capacity, type);
-    initialize();
+
     reserveInternal(capacity);
     reset();
   }
diff --git a/sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/WritableColumnVector.java b/sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/WritableColumnVector.java
index 3ee9ca7e1970c..d1fe229e6d4c6 100644
--- a/sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/WritableColumnVector.java
+++ b/sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/WritableColumnVector.java
@@ -607,9 +607,12 @@ public WritableColumnVector getDictionaryIds() {
   protected abstract WritableColumnVector reserveNewColumn(int capacity, DataType type);
 
   /**
-   * Initialize child columns.
+   * Sets up the common state and also handles creating the child columns if this is a nested
+   * type.
    */
-  protected void initialize() {
+  protected WritableColumnVector(int capacity, DataType type) {
+    super(capacity, type);
+
     if (type instanceof ArrayType || type instanceof BinaryType || type instanceof StringType
         || DecimalType.isByteArrayDecimalType(type)) {
       DataType childType;
@@ -645,12 +648,4 @@ protected void initialize() {
       this.resultStruct = null;
     }
   }
-
-  /**
-   * Sets up the common state and also handles creating the child columns if this is a nested
-   * type.
-   */
-  protected WritableColumnVector(int capacity, DataType type) {
-    super(capacity, type);
-  }
 }