Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18654
schema and the footer in case of Parquet. There is more context here -
https://github.com/apache/spark/pull/17395#discussion_r107611325.
For example, if we don't write out the empty files, it breaks:
```scala
spark.range(100).filter("id > 100").write.parquet("/tmp/abc")
spark.read.parquet("/tmp/abc").show()
```
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