cxzl25 commented on PR #5591:
URL: https://github.com/apache/kyuubi/pull/5591#issuecomment-1837993078
> The output seems to be in order even when outputting multiple files.
When Spark reads datasource, it will be sorted by file length, so there is
no guarantee.
org.apache.spark.sql.execution.datasources.v2.FileScan#partitions
```scala
partition.files.flatMap { file =>
PartitionedFileUtil.splitFiles(
file = file,
isSplitable = isSplitable(file.getPath),
maxSplitBytes = maxSplitBytes,
partitionValues = partitionValues
)
}.toArray.sortBy(_.length)(implicitly[Ordering[Long]].reverse)
```
https://github.com/apache/spark/blob/4398bb5d37328e2f3594302d98f98803a379a2e9/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/FileScan.scala#L146-L160
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