collect only relevant meta for deletion vector merge

Author: jihoonson

delta-lake/common/src/main/delta-33x-40x/scala/com/nvidia/spark/rapids/delta/common/GpuDeltaParquetFileFormatBase2.scala

@@ -696,7 +696,7 @@ class GpuDeltaParquetFileFormatBase2(
     ): HostMemoryBuffersWithMetaData = {
       val metaToUse = combinedMeta.firstNonEmpty
       val toCombine = combinedMeta.toCombine
-        .map(_.asInstanceOf[DeltaParquetHostMemoryBuffersWithMetaData])
+        .collect { case hmb: DeltaParquetHostMemoryBuffersWithMetaData => hmb }
       val combinedDVMeta = DeletionVectorMetadata.combine(toCombine.flatMap(_.dvMetadata))
 
       DeltaParquetHostMemoryBuffersWithMetaData(