brunal commented on code in PR #16342:
URL: https://github.com/apache/datafusion/pull/16342#discussion_r2185262228
##########
datafusion/datasource/src/file_sink_config.rs:
##########
@@ -77,13 +79,34 @@ pub trait FileSink: DataSink {
.runtime_env()
.object_store(&config.object_store_url)?;
let (demux_task, file_stream_rx) = start_demuxer_task(config, data,
context);
- self.spawn_writer_tasks_and_join(
- context,
- demux_task,
- file_stream_rx,
- object_store,
- )
- .await
+ let mut num_rows = self
+ .spawn_writer_tasks_and_join(
+ context,
+ demux_task,
+ file_stream_rx,
+ Arc::clone(&object_store),
+ )
+ .await?;
+ if num_rows == 0 {
+ // If no rows were written, then no files are output either.
Review Comment:
You say now row => no file was created.
But then you say write an empty recordbatch => ensure a file gets created.
Except an empty recordbatch has no rows (at least when written to a parquet
file).
Your 2 sentences don't make sense together.
In practice, this PR caused a regression: we cannot write empty recordbatch
to parquet anymore, as the code here tries to write it a second time, and we
get an error.
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