[GitHub] [arrow-datafusion] thinkharderdev commented on a change in pull request #1622: Handle merging of evolved schemas in ParquetExec

[GitBox <gi...@apache.org>]

thinkharderdev commented on a change in pull request #1622:
URL: https://github.com/apache/arrow-datafusion/pull/1622#discussion_r789563040



##########
File path: datafusion/src/physical_plan/file_format/parquet.rs
##########
@@ -385,9 +388,35 @@ fn build_row_group_predicate(
     }
 }
 
+// Map projections from the schema which merges all file schemas to projections on a particular
+// file
+fn map_projections(
+    merged_schema: &Schema,
+    file_schema: &Schema,
+    projections: &[usize],
+) -> Vec<usize> {
+    if merged_schema.fields().len() == file_schema.fields().len() {
+        projections.to_vec()
+    } else {
+        let mut mapped: Vec<usize> = vec![];
+        for idx in projections {
+            let field = merged_schema.field(*idx);
+            if let Ok(file_field) = file_schema.field_with_name(field.name().as_str()) {

Review comment:
       Yeah. that makes sense. Fixed!




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