xanderbailey commented on code in PR #2398:
URL: https://github.com/apache/iceberg-rust/pull/2398#discussion_r3976978507
##########
crates/iceberg/src/arrow/reader/pipeline.rs:
##########
@@ -692,6 +721,69 @@ impl FileScanTaskReader {
Ok(Box::pin(record_batch_stream) as ArrowRecordBatchStream)
}
+
+ /// Reads bloom filters for relevant columns and evaluates the predicate
+ /// against them to filter out row groups that definitely don't match.
+ async fn filter_row_groups_by_bloom_filter(
+ predicate: &crate::expr::BoundPredicate,
+ builder: &mut ParquetRecordBatchStreamBuilder<ArrowFileReader>,
+ candidate_row_groups: &[usize],
+ field_id_map: &HashMap<i32, usize>,
+ ) -> Result<Vec<usize>> {
+ // Only collect field IDs from eq/in predicates — the only types
+ // bloom filters can help with. Skip columns not in the parquet schema.
+ let bloom_filter_field_ids: Vec<i32> =
collect_bloom_filter_field_ids(predicate)?
+ .into_iter()
+ .filter(|id| field_id_map.contains_key(id))
+ .collect();
+
+ if bloom_filter_field_ids.is_empty() {
+ return Ok(candidate_row_groups.to_vec());
+ }
+
+ let mut result = Vec::with_capacity(candidate_row_groups.len());
+
+ for &rg_idx in candidate_row_groups {
+ let mut bloom_filters: HashMap<i32, ColumnBloomFilter> =
HashMap::new();
+
+ for &field_id in &bloom_filter_field_ids {
+ let col_idx = field_id_map[&field_id];
+ let col_meta =
builder.metadata().row_group(rg_idx).column(col_idx);
+
+ // Only attempt to load if this column chunk actually has a
bloom filter
+ if col_meta.bloom_filter_offset().is_none() {
+ continue;
+ }
+
+ let physical_type = col_meta.column_type();
+ let type_length = col_meta.column_descr().type_length();
+
+ match builder
+ .get_row_group_column_bloom_filter(rg_idx, col_idx)
+ .await
+ {
+ Ok(Some(sbbf)) => {
+ bloom_filters.insert(
+ field_id,
+ ColumnBloomFilter::new(sbbf, physical_type,
type_length),
+ );
+ }
+ Ok(None) => {}
+ Err(_) => {
Review Comment:
[32302b7](https://github.com/apache/iceberg-rust/pull/2398/commits/32302b7b8698a090d7074c6a4cd801ad5a8b0b09)
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