viirya commented on code in PR #295:
URL: https://github.com/apache/iceberg-rust/pull/295#discussion_r1567725081
##########
crates/iceberg/src/arrow/reader.rs:
##########
@@ -186,4 +216,399 @@ impl ArrowReader {
Ok(ProjectionMask::leaves(parquet_schema, indices))
}
}
+
+ fn get_row_filter(&self, parquet_schema: &SchemaDescriptor) ->
Result<Option<RowFilter>> {
+ if let Some(predicates) = &self.predicates {
+ let field_id_map = self.build_field_id_map(parquet_schema)?;
+
+ // Collect Parquet column indices from field ids
+ let mut collector = CollectFieldIdVisitor { field_ids: vec![] };
+ visit_predicate(&mut collector, predicates).unwrap();
+ let column_indices = collector
+ .field_ids
+ .iter()
+ .map(|field_id| {
+ field_id_map.get(field_id).cloned().ok_or_else(|| {
+ Error::new(ErrorKind::DataInvalid, "Field id not found
in schema")
+ })
+ })
+ .collect::<Result<Vec<_>>>()?;
+
+ // Convert BoundPredicates to ArrowPredicates
+ let mut converter = PredicateConverter {
+ columns: &column_indices,
+ projection_mask: ProjectionMask::leaves(parquet_schema,
column_indices.clone()),
+ parquet_schema,
+ column_map: &field_id_map,
+ };
+ let arrow_predicate = visit_predicate(&mut converter, predicates)?;
+ Ok(Some(RowFilter::new(vec![arrow_predicate])))
+ } else {
+ Ok(None)
+ }
+ }
+
+ /// Build the map of field id to Parquet column index in the schema.
+ fn build_field_id_map(&self, parquet_schema: &SchemaDescriptor) ->
Result<HashMap<i32, usize>> {
+ let mut column_map = HashMap::new();
+ for (idx, field) in parquet_schema.columns().iter().enumerate() {
+ let field_type = field.self_type();
+ match field_type {
+ ParquetType::PrimitiveType { basic_info, .. } => {
+ if !basic_info.has_id() {
+ return Err(Error::new(
+ ErrorKind::DataInvalid,
+ format!(
+ "Leave column {:?} in schema doesn't have
field id",
+ field_type
+ ),
+ ));
+ }
+ column_map.insert(basic_info.id(), idx);
+ }
+ ParquetType::GroupType { .. } => {
+ return Err(Error::new(
+ ErrorKind::DataInvalid,
+ format!(
+ "Leave column in schema should be primitive type
but got {:?}",
+ field_type
+ ),
+ ));
+ }
+ };
+ }
+
+ Ok(column_map)
+ }
+}
+
+/// A visitor to collect field ids from bound predicates.
+struct CollectFieldIdVisitor {
+ field_ids: Vec<i32>,
+}
+
+impl BoundPredicateVisitor for CollectFieldIdVisitor {
Review Comment:
Okay, let me take a look, not sure if it is completely suitable for the
usage here, especially for `PredicateConverter`. But let me try it.
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