korowa commented on code in PR #2591:
URL: https://github.com/apache/arrow-datafusion/pull/2591#discussion_r879834683
##########
datafusion/core/src/physical_plan/hash_join.rs:
##########
@@ -791,6 +826,109 @@ fn build_join_indexes(
}
}
+fn apply_join_filter(
+ left: &RecordBatch,
+ right: &RecordBatch,
+ join_type: JoinType,
+ left_indices: UInt64Array,
+ right_indices: UInt32Array,
+ filter: &JoinFilter,
+) -> Result<(UInt64Array, UInt32Array)> {
+ if left_indices.is_empty() {
+ return Ok((left_indices, right_indices));
+ };
+
+ let (intermediate_batch, _) = build_batch_from_indices(
+ filter.schema(),
+ left,
+ right,
+ PrimitiveArray::from(left_indices.data().clone()),
+ PrimitiveArray::from(right_indices.data().clone()),
+ filter.column_indices(),
+ )?;
+
+ match join_type {
+ JoinType::Inner | JoinType::Left => {
+ // For both INNER and LEFT joins, input arrays contains only
indices for matched data.
+ // Due to this fact it's correct to simply apply filter to
intermediate batch and return
+ // indices for left/right rows satisfying filter predicate
+ let filter_result = filter
+ .expression()
+ .evaluate(&intermediate_batch)?
+ .into_array(intermediate_batch.num_rows());
+ let mask = as_boolean_array(&filter_result);
+
+ let left_filtered = PrimitiveArray::<UInt64Type>::from(
+ compute::filter(&left_indices, mask)?.data().clone(),
Review Comment:
Yes, at physical level filter always applied after actual join operation.
And you're right - there are cases when it's fine to filter inputs before
join step - but here it's responsibility of logical planner / optimizer - they
both are able to check if predicate (or its part) could be pushed before join -
closer to scan.
So, when it comes to physical join, logical plan supposed to contain only
`t1.field < t2.field`-like predicates which could not be applied before join
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