fix: bytes scanned in query

src/query/stream_schema_provider.rs

@@ -327,7 +327,7 @@ impl StandardTableProvider {
         let mut partitioned_files = Vec::from_iter((0..target_partition).map(|_| Vec::new()));
         let mut column_statistics = HashMap::<String, Option<TypedStatistics>>::new();
         let mut count = 0;
-        let mut total_file_size = 0u64;
+        let mut total_compressed_size = 0u64;
         let mut file_count = 0u64;
         for (index, file) in manifest_files
             .into_iter()
@@ -339,13 +339,14 @@ impl StandardTableProvider {
                 mut file_path,
                 num_rows,
                 columns,
-                file_size,
                 ..
             } = file;
 
             // Track billing metrics for files scanned in query
             file_count += 1;
-            total_file_size += file_size;
+            // Calculate actual compressed bytes that will be read from storage
+            let compressed_bytes: u64 = columns.iter().map(|col| col.compressed_size).sum();
+            total_compressed_size += compressed_bytes;
 
             // object_store::path::Path doesn't automatically deal with Windows path separators
             // to do that, we are using from_absolute_path() which takes into consideration the underlying filesystem
@@ -406,7 +407,8 @@ impl StandardTableProvider {
         // Track billing metrics for query scan
         let current_date = chrono::Utc::now().date_naive().to_string();
         increment_files_scanned_in_query_by_date(file_count, &current_date);
-        increment_bytes_scanned_in_query_by_date(total_file_size, &current_date);
+        // Use compressed size as it represents actual bytes read from storage (S3/object store charges)
+        increment_bytes_scanned_in_query_by_date(total_compressed_size, &current_date);
 
         (partitioned_files, statistics)
     }