comphead commented on code in PR #12523:
URL: https://github.com/apache/datafusion/pull/12523#discussion_r1769076385
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datafusion/physical-plan/src/joins/hash_join.rs:
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@@ -71,11 +71,68 @@ use datafusion_physical_expr::equivalence::{
use datafusion_physical_expr::PhysicalExprRef;
use ahash::RandomState;
+use arrow_buffer::BooleanBuffer;
use datafusion_expr::Operator;
use datafusion_physical_expr_common::datum::compare_op_for_nested;
use futures::{ready, Stream, StreamExt, TryStreamExt};
use parking_lot::Mutex;
+/// `SharedJoinState` provides an extension point allowing
+/// `HashJoinStream` to share the `visited_indices_bitmap` of the build side
of a join
+/// across probe tasks without shared memory.
+///
+/// This can be used to, for example, implement a left outer join efficiently
as a broadcast join
+/// if the left side is small
Review Comment:
is it left side small or right? My feeling was the left(driving) table is
huge and right is small
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