alamb commented on issue #16684:
URL: https://github.com/apache/datafusion/issues/16684#issuecomment-3357539151

   I am not sure this is fixed
   
   
   🤔  Even after https://github.com/apache/datafusion/pull/16696 was merged, I 
reran the example above and  `parent_id` and `value` still appear in the data 
projection 🤔 
   
   
   > projection=[id, parent_id, value]
   
   ```
   |                   |               DataSourceExec: file_groups={1 group: 
[[var/folders/1l/tg68jc6550gg8xqf1hr4mlwr0000gn/T/.tmp5qwtgT/sample_data.parquet]]},
 projection=[id, parent_id, value], file_type=parquet, predicate=id@0 = 1, 
pruning_predicate=id_null_count@2 != row_count@3 AND id_min@0 <= 1 AND 1 <= 
id_max@1, required_guarantees=[id in (1)], metrics=[output_rows=10, 
elapsed_compute=1ns, batches_split=0, bytes_scanned=357, file_open_errors=0, 
file_scan_errors=0, files_ranges_pruned_statistics=0, 
num_predicate_creation_errors=0, page_index_rows_matched=10, 
page_index_rows_pruned=0, predicate_cache_inner_records=0, 
predicate_cache_records=0, predicate_evaluation_errors=0, 
pushdown_rows_matched=0, pushdown_rows_pruned=0, 
row_groups_matched_bloom_filter=0, row_groups_matched_statistics=1, 
row_groups_pruned_bloom_filter=0, row_groups_pruned_statistics=0, 
bloom_filter_eval_time=138.585µs, metadata_load_time=92.293µs, 
page_index_eval_time=139.501µs, row_pushdown_eval_time=2ns, 
 statistics_eval_time=83.584µs, time_elapsed_opening=1.047125ms, 
time_elapsed_processing=1.194541ms, time_elapsed_scanning_total=200.375µs, 
time_elapsed_scanning_until_data=182.459µs] |```


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