liukun4515 commented on code in PR #1935:
URL: https://github.com/apache/arrow-rs/pull/1935#discussion_r908500212
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parquet/src/file/writer.rs:
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@@ -339,11 +400,11 @@ impl<'a, W: Write> SerializedRowGroupWriter<'a, W> {
.set_num_rows(self.total_rows_written.unwrap_or(0) as i64)
.build()?;
- let metadata = Arc::new(row_group_metadata);
- self.row_group_metadata = Some(metadata.clone());
+ let clone_row_group_metadata = row_group_metadata.clone();
+ self.row_group_metadata = Some(Arc::new(row_group_metadata));
Review Comment:
> I think I would prefer we clone at the location that the mutation happens,
i.e. ParquetWriter, as opposed to modifying this interface
Yes, the current implementation is not change the interface, but the clone
may have some cost.
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