Github user liancheng commented on a diff in the pull request: https://github.com/apache/spark/pull/4792#discussion_r25554933 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/parquet/newParquet.scala --- @@ -483,16 +487,42 @@ private[sql] case class ParquetRelation2( val requiredPartOrdinal = partitionKeyLocations.keys.toSeq - iterator.map { pair => - val row = pair._2.asInstanceOf[SpecificMutableRow] - var i = 0 - while (i < requiredPartOrdinal.size) { - // TODO Avoids boxing cost here! - val partOrdinal = requiredPartOrdinal(i) - row.update(partitionKeyLocations(partOrdinal), partValues(partOrdinal)) - i += 1 + if (primitiveRow) { + iterator.map { pair => + // We are using CatalystPrimitiveRowConverter and it returns a SpecificMutableRow. + val row = pair._2.asInstanceOf[SpecificMutableRow] + var i = 0 + while (i < requiredPartOrdinal.size) { + // TODO Avoids boxing cost here! + val partOrdinal = requiredPartOrdinal(i) + row.update(partitionKeyLocations(partOrdinal), partValues(partOrdinal)) + i += 1 + } + row + } + } else { + // Create a mutable row since we need to fill in values from partition columns. + val mutableRow = new GenericMutableRow(requestedSchema.size) --- End diff -- This is not necessary. Unlike `output.size` in `ParquetTableScan`, `requestedSchema` here is already a local variable.
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