alamb commented on PR #17875:
URL: https://github.com/apache/datafusion/pull/17875#issuecomment-3366566660

   I ran the reproducer from 
   -  https://github.com/apache/datafusion/issues/16684
   
   With the code from this PR and the output is:
   
   ```
   |                   |               DataSourceExec: file_groups={1 group: 
[[var/folders/1l/tg68jc6550gg8xqf1hr4mlwr0000gn/T/.tmpgg4Dpy/sample_data.parquet]]},
 projection=[id], 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=123, 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=146.668µs, metadata_load_time=272.042µs, 
page_index_eval_time=141.793µs, row_pushdown_eval_time=2ns, statistics_eval_t
 ime=138.251µs, time_elapsed_opening=1.353083ms, 
time_elapsed_processing=1.590625ms, time_elapsed_scanning_total=372.166µs, 
time_elapsed_scanning_until_data=335.25µs] |
   ```
   
   Which has only the necessary columns, as expected:
   ```
   projection=[id]
   ```
   
   🎉 
   
   Thank you @kosiew 


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