[spark] Fix the IOManager not work in spark reader (#6401)

Author: Aitozi

paimon-spark/paimon-spark-common/src/main/scala/org/apache/paimon/spark/PaimonPartitionReader.scala

@@ -44,10 +44,10 @@ case class PaimonPartitionReader(
 ) extends PartitionReader[InternalRow] {
 
   private val splits: Iterator[Split] = partition.splits.toIterator
-  @Nullable private var currentRecordReader = readSplit()
   private var advanced = false
   private var currentRow: PaimonInternalRow = _
   private val ioManager: IOManager = createIOManager()
+  @Nullable private var currentRecordReader = readSplit()
   private val sparkRow: SparkInternalRow = {
     val dataFields = new JList(readBuilder.readType().getFields)
     dataFields.addAll(metadataColumns.map(_.toPaimonDataField).asJava)