HyukjinKwon commented on a change in pull request #24473: [SPARK-27534][SQL] Do
not load `content` column in binary data source if it is not selected
URL: https://github.com/apache/spark/pull/24473#discussion_r279173991
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/binaryfile/BinaryFileFormat.scala
##########
@@ -101,43 +98,27 @@ class BinaryFileFormat extends FileFormat with
DataSourceRegister {
val filterFuncs = filters.map(filter => createFilterFunction(filter))
file: PartitionedFile => {
- val path = file.filePath
- val fsPath = new Path(path)
-
+ val path = new Path(file.filePath)
// TODO: Improve performance here: each file will recompile the glob
pattern here.
- if (pathGlobPattern.forall(new GlobFilter(_).accept(fsPath))) {
- val fs = fsPath.getFileSystem(broadcastedHadoopConf.value.value)
- val fileStatus = fs.getFileStatus(fsPath)
- val length = fileStatus.getLen
- val modificationTime = fileStatus.getModificationTime
-
- if (filterFuncs.forall(_.apply(fileStatus))) {
- val stream = fs.open(fsPath)
- val content = try {
- ByteStreams.toByteArray(stream)
- } finally {
- Closeables.close(stream, true)
- }
-
- val fullOutput = dataSchema.map { f =>
- AttributeReference(f.name, f.dataType, f.nullable, f.metadata)()
- }
- val requiredOutput = fullOutput.filter { a =>
- requiredSchema.fieldNames.contains(a.name)
+ if (pathGlobPattern.forall(new GlobFilter(_).accept(path))) {
Review comment:
Can we make it one if-else while we're here? For instance,
```scala
val isPatternMatched = pathGlobPattern.forall(new
GlobFilter(_).accept(fsPath))
// These vals are intentionally lazy to avoid unnecessary file access via
short-circuiting.
lazy val fs = fsPath.getFileSystem(broadcastedHadoopConf.value.value)
lazy val fileStatus = fs.getFileStatus(fsPath)
lazy val shouldNotFilterOut = filterFuncs.forall(_.apply(fileStatus))
if (isPatternMatched && shouldNotFilterOut) {
...
Iterator(requiredColumns(internalRow))
} else {
Iterator.empty[InternalRow]
}
```
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