jonathanc-n commented on code in PR #16443:
URL: https://github.com/apache/datafusion/pull/16443#discussion_r2182837993


##########
datafusion/physical-plan/src/joins/utils.rs:
##########
@@ -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:
   Yes but I believe this removes the purpose of the pull request if we are 
building the entire amount of indices? I may be missing something though



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