Github user nongli commented on a diff in the pull request: https://github.com/apache/spark/pull/10498#discussion_r49002988 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/WriterContainer.scala --- @@ -335,6 +339,121 @@ private[sql] class DynamicPartitionWriterContainer( val partitionName = Literal(c.name + "=") :: str :: Nil if (i == 0) partitionName else Literal(Path.SEPARATOR) :: partitionName } + } + + private def getBucketIdFromKey(key: InternalRow): Option[Int] = { + if (bucketSpec.isDefined) { + Some(key.getInt(partitionColumns.length)) + } else { + None + } + } + + private def sameBucket(key1: UnsafeRow, key2: UnsafeRow): Boolean = { + val bucketIdIndex = partitionColumns.length + if (key1.getInt(bucketIdIndex) != key2.getInt(bucketIdIndex)) { + false + } else { + var i = partitionColumns.length - 1 + while (i >= 0) { + val dt = partitionColumns(i).dataType + if (key1.get(i, dt) != key2.get(i, dt)) return false + i -= 1 + } + true + } + } + + private def sortBasedWrite( + sorter: UnsafeKVExternalSorter, + iterator: Iterator[InternalRow], + getSortingKey: UnsafeProjection, + getOutputRow: UnsafeProjection, + getPartitionString: UnsafeProjection, + outputWriters: java.util.HashMap[InternalRow, OutputWriter]): Unit = { + while (iterator.hasNext) { + val currentRow = iterator.next() + sorter.insertKV(getSortingKey(currentRow), getOutputRow(currentRow)) + } + + logInfo(s"Sorting complete. Writing out partition files one at a time.") + + val needNewWriter: (UnsafeRow, UnsafeRow) => Boolean = if (sortColumns.isEmpty) { + (key1, key2) => key1 != key2 + } else { + (key1, key2) => key1 == null || !sameBucket(key1, key2) + } + + val sortedIterator = sorter.sortedIterator() + var currentKey: UnsafeRow = null + var currentWriter: OutputWriter = null + try { + while (sortedIterator.next()) { + if (needNewWriter(currentKey, sortedIterator.getKey)) { + if (currentWriter != null) { + currentWriter.close() + } + currentKey = sortedIterator.getKey.copy() + logDebug(s"Writing partition: $currentKey") + + // Either use an existing file from before, or open a new one. + currentWriter = outputWriters.remove(currentKey) + if (currentWriter == null) { + currentWriter = newOutputWriter(currentKey, getPartitionString) + } + } + + currentWriter.writeInternal(sortedIterator.getValue) + } + } finally { + if (currentWriter != null) { currentWriter.close() } + } + } + + /** + * Open and returns a new OutputWriter given a partition key and optional bucket id. + * If bucket id is specified, we will append it to the end of the file name, but before the + * file extension, e.g. part-r-00009-ea518ad4-455a-4431-b471-d24e03814677-00002.gz.parquet + */ + private def newOutputWriter( + key: InternalRow, + getPartitionString: UnsafeProjection): OutputWriter = { + val configuration = taskAttemptContext.getConfiguration + val path = if (partitionColumns.nonEmpty) { + val partitionPath = getPartitionString(key).getString(0) + configuration.set( + "spark.sql.sources.output.path", new Path(outputPath, partitionPath).toString) + new Path(getWorkPath, partitionPath).toString + } else { + configuration.set("spark.sql.sources.output.path", outputPath) + getWorkPath + } + val bucketId = getBucketIdFromKey(key) + val newWriter = super.newOutputWriter(path, bucketId) + newWriter.initConverter(dataSchema) + newWriter + } + + def writeRows(taskContext: TaskContext, iterator: Iterator[InternalRow]): Unit = { + val outputWriters = new java.util.HashMap[InternalRow, OutputWriter] + executorSideSetup(taskContext) + + var outputWritersCleared = false + + // We should first sort by partition columns, then bucket id, and finally sorting columns. + val getSortingKey = + UnsafeProjection.create(partitionColumns ++ bucketIdExpression ++ sortColumns, inputSchema) + + val sortingKeySchema = if (bucketSpec.isEmpty) { + StructType.fromAttributes(partitionColumns) + } else { // If it's bucketed, we should also consider bucket id as part of the key. + val fields = StructType.fromAttributes(partitionColumns) + .add("bucketId", IntegerType, nullable = false) ++ StructType.fromAttributes(sortColumns) + StructType(fields) + } --- End diff -- can this be simplifed to sortingKeySchema = // what you have val getSortingKey = UnsafeProject.create(sortingKeySchema) ?
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