diff --git a/sql/core/src/main/scala/org/apache/spark/sql/parquet/ParquetTableSupport.scala b/sql/core/src/main/scala/org/apache/spark/sql/parquet/ParquetTableSupport.scala
index ef3687e692964..9049eb5932b79 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/parquet/ParquetTableSupport.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/parquet/ParquetTableSupport.scala
@@ -130,7 +130,7 @@ private[parquet] object RowReadSupport {
 private[parquet] class RowWriteSupport extends WriteSupport[Row] with Logging {
 
   private[parquet] var writer: RecordConsumer = null
-  private[parquet] var attributes: Seq[Attribute] = null
+  private[parquet] var attributes: Array[Attribute] = null
 
   override def init(configuration: Configuration): WriteSupport.WriteContext = {
     val origAttributesStr: String = configuration.get(RowWriteSupport.SPARK_ROW_SCHEMA)
@@ -138,7 +138,7 @@ private[parquet] class RowWriteSupport extends WriteSupport[Row] with Logging {
     metadata.put(RowReadSupport.SPARK_METADATA_KEY, origAttributesStr)
 
     if (attributes == null) {
-      attributes = ParquetTypesConverter.convertFromString(origAttributesStr)
+      attributes = ParquetTypesConverter.convertFromString(origAttributesStr).toArray
     }
 
     log.debug(s"write support initialized for requested schema $attributes")