andygrove commented on code in PR #3059:
URL: https://github.com/apache/datafusion-comet/pull/3059#discussion_r2679846996
##########
native/core/src/execution/shuffle/row.rs:
##########
@@ -776,16 +776,27 @@ pub fn process_sorted_row_partition(
None
};
+ // Create builders once and reuse them across batches.
+ // After finish() is called, builders are reset and can be reused.
+ let mut data_builders: Vec<Box<dyn ArrayBuilder>> = vec![];
+ schema.iter().try_for_each(|dt| {
+ make_builders(dt, batch_size, prefer_dictionary_ratio)
+ .map(|builder| data_builders.push(builder))?;
+ Ok::<(), CometError>(())
+ })?;
+
+ // Open the output file once and reuse it across batches
+ let mut output_data = OpenOptions::new()
+ .create(true)
+ .append(true)
+ .open(&output_path)?;
+
+ // Reusable buffer for serialized batch data
+ let mut frozen: Vec<u8> = Vec::with_capacity(batch_size * 1024);
Review Comment:
This was arbitrary. I changed this now just to use `Vec::new`.
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