cloud-fan commented on a change in pull request #34575:
URL: https://github.com/apache/spark/pull/34575#discussion_r773672049
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileScanRDD.scala
##########
@@ -103,6 +115,101 @@ class FileScanRDD(
context.killTaskIfInterrupted()
(currentIterator != null && currentIterator.hasNext) || nextIterator()
}
+
+ ///////////////////////////
+ // FILE METADATA METHODS //
+ ///////////////////////////
+
+ // a metadata internal row, will only be updated when the current file
is changed
+ val metadataRow: InternalRow = new
GenericInternalRow(metadataColumns.length)
+
+ // an unsafe projection to convert a joined internal row to an unsafe row
+ private lazy val projection = {
+ val joinedExpressions =
+ readDataSchema.fields.map(_.dataType) ++
metadataColumns.map(_.dataType)
+ UnsafeProjection.create(joinedExpressions)
+ }
+
+ /**
+ * For each partitioned file, metadata columns for each record in the
file are exactly same.
+ * Only update metadata row when `currentFile` is changed.
+ */
+ private def updateMetadataRow(): Unit = {
+ if (metadataColumns.nonEmpty && currentFile != null) {
+ val path = new Path(currentFile.filePath)
+ metadataColumns.zipWithIndex.foreach { case (attr, i) =>
+ attr.name match {
+ case FILE_PATH => metadataRow.update(i,
UTF8String.fromString(path.toString))
+ case FILE_NAME => metadataRow.update(i,
UTF8String.fromString(path.getName))
+ case FILE_SIZE => metadataRow.update(i, currentFile.fileSize)
+ case FILE_MODIFICATION_TIME =>
+ // the modificationTime from the file is in millisecond,
+ // while internally, the TimestampType is stored in microsecond
+ metadataRow.update(i, currentFile.modificationTime * 1000L)
+ }
+ }
+ }
+ }
+
+ /**
+ * Create a writable column vector containing all required metadata
columns
+ */
+ private def createMetadataColumnVector(c: ColumnarBatch):
Array[WritableColumnVector] = {
+ val path = new Path(currentFile.filePath)
+ val filePathBytes = path.toString.getBytes
+ val fileNameBytes = path.getName.getBytes
+ var rowId = 0
+ metadataColumns.map(_.name).map {
Review comment:
per-batch should be fine to have some small overhead.
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