friendlymatthew commented on code in PR #20854:
URL: https://github.com/apache/datafusion/pull/20854#discussion_r2927130524
##########
datafusion/datasource-parquet/src/row_filter.rs:
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@@ -519,6 +562,149 @@ fn leaf_indices_for_roots(
.collect()
}
+/// Resolves struct field access to specific Parquet leaf column indices
+///
+/// For every `StructFieldAccess`, finds the leaf columns in the Parquet schema
+/// whose path matches the struct root name + field path. This avoids reading
all
+/// leaves of a struct when only specific fields are needed
+fn resolve_struct_field_leaves(
+ accesses: &[StructFieldAccess],
+ file_schema: &Schema,
+ schema_descr: &SchemaDescriptor,
+) -> Vec<usize> {
Review Comment:
Think this makes a lot of sense. I've charted a big picture idea of what
this refactor will look like: https://github.com/apache/datafusion/pull/20913
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