Dandandan commented on code in PR #14766:
URL: https://github.com/apache/datafusion/pull/14766#discussion_r1965294394
##########
datafusion-cli/src/exec.rs:
##########
@@ -247,10 +253,29 @@ pub(super) async fn exec_and_print(
let stream = execute_stream(physical_plan, task_ctx.clone())?;
print_options.print_stream(stream, now).await?;
} else {
- // Bounded stream; collected results are printed after all input
consumed.
+ // Bounded stream; collected results size is limited by the
maxrows option
let schema = physical_plan.schema();
- let results = collect(physical_plan, task_ctx.clone()).await?;
- adjusted.into_inner().print_batches(schema, &results, now)?;
+ let mut stream = execute_stream(physical_plan, task_ctx.clone())?;
+ let mut results = vec![];
+ let mut row_count = 0_usize;
+ while let Some(batch) = stream.next().await {
+ let batch = batch?;
+ let curr_num_rows = batch.num_rows();
+ if let MaxRows::Limited(max_rows) = print_options.maxrows {
+ // Stop collecting results if the number of rows exceeds
the limit
+ // results batch should include the last batch that
exceeds the limit
+ if row_count < max_rows + curr_num_rows {
+ // Try to grow the reservation to accommodate the
batch in memory
+
reservation.try_grow(get_record_batch_memory_size(&batch))?;
+ results.push(batch);
+ }
+ }
+ row_count += curr_num_rows;
+ }
+ adjusted
+ .into_inner()
+ .print_batches(schema, &results, now, row_count)?;
Review Comment:
Would be nice if it even could print based on the stream instead of
collecting.
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