Fix ArrowReaderOptions should read with physical_file_schema so we do… (#17)

* Fix ArrowReaderOptions should read with physical_file_schema so we don't need to cast back to utf8

* Fix fmt

Author: zhuqi-lucas

datafusion/datasource-parquet/src/opener.rs

@@ -153,7 +153,9 @@ impl FileOpener for ParquetOpener {
                     metadata,
                     &mut reader,
                     // Since we're manually loading the page index the option here should not matter but we pass it in for consistency
-                    ArrowReaderOptions::new().with_page_index(true),
+                    ArrowReaderOptions::new()
+                        .with_page_index(true)
+                        .with_schema(physical_file_schema.clone()),
                 )
                 .await?;
             }