zhuqi-lucas commented on code in PR #14644:
URL: https://github.com/apache/datafusion/pull/14644#discussion_r1957058065
##########
datafusion/physical-plan/src/sorts/sort.rs:
##########
@@ -641,7 +702,15 @@ pub fn sort_batch(
lexsort_to_indices(&sort_columns, fetch)?
};
- let columns = take_arrays(batch.columns(), &indices, None)?;
+ let mut columns = take_arrays(batch.columns(), &indices, None)?;
+
+ // The columns may be larger than the unsorted columns in `batch`
especially for variable length
+ // data types due to exponential growth when building the sort columns. We
shrink the columns
+ // to prevent memory reservation failures, as well as excessive memory
allocation when running
+ // merges in `SortPreservingMergeStream`.
+ columns.iter_mut().for_each(|c| {
Review Comment:
It makes sense.
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