WeichenXu123 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_r279114729
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/binaryfile/BinaryFileFormat.scala
##########
@@ -206,6 +188,23 @@ object BinaryFileFormat {
case _ => (_ => true)
}
}
+
+ private[binaryfile] def genPrunedRow(
+ path: String,
+ status: FileStatus,
+ readContent: => Array[Byte],
+ requiredFieldNames: Array[String]): InternalRow = {
+
+ val values = requiredFieldNames.map {
+ case PATH => UTF8String.fromString(path)
+ case LENGTH => status.getLen
+ case MODIFICATION_TIME =>
DateTimeUtils.fromMillis(status.getModificationTime)
+ case CONTENT => readContent
Review comment:
But I think current code is simpler.
The previous code contains some code which is hard to read:
```
val fullOutput = dataSchema.map { f =>
AttributeReference(f.name, f.dataType, f.nullable, f.metadata)()
}
val requiredOutput = fullOutput.filter { a =>
requiredSchema.fieldNames.contains(a.name)
}
val requiredColumns =
GenerateUnsafeProjection.generate(requiredOutput, fullOutput)
...
Iterator(requiredColumns(internalRow))
```
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