add: log schema inference process in ParquetFormat

Author: kosiew

datafusion/core/src/datasource/file_format/parquet.rs

@@ -335,6 +335,7 @@ impl FileFormat for ParquetFormat {
         store: &Arc<dyn ObjectStore>,
         objects: &[ObjectMeta],
     ) -> Result<SchemaRef> {
+        println!("==> parquet.rs: infer_schema");
         let mut schemas: Vec<_> = futures::stream::iter(objects)
             .map(|object| {
                 fetch_schema_with_location(