UBarney commented on code in PR #16443:
URL: https://github.com/apache/datafusion/pull/16443#discussion_r2182935284
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datafusion/physical-plan/src/joins/utils.rs:
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@@ -843,24 +844,56 @@ pub(crate) fn apply_join_filter_to_indices(
probe_indices: UInt32Array,
filter: &JoinFilter,
build_side: JoinSide,
+ max_intermediate_size: Option<usize>,
) -> Result<(UInt64Array, UInt32Array)> {
if build_indices.is_empty() && probe_indices.is_empty() {
return Ok((build_indices, probe_indices));
};
- let intermediate_batch = build_batch_from_indices(
- filter.schema(),
- build_input_buffer,
- probe_batch,
- &build_indices,
- &probe_indices,
- filter.column_indices(),
- build_side,
- )?;
- let filter_result = filter
- .expression()
- .evaluate(&intermediate_batch)?
- .into_array(intermediate_batch.num_rows())?;
+ let filter_result = if let Some(max_size) = max_intermediate_size {
Review Comment:
> I believe this removes the purpose of the pull request if we are building
the entire amount of indices
This PR only limits the size of the intermediate `record_batch`. The
Cartesian product of the entire `left_table` and `right_batch` is still
generated at once (this will be limited in a subsequent PR).
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