fix: remove unused import and update default compression to ZSTD in rs' write_parquet method

Author: kosiew

python/datafusion/dataframe.py

@@ -36,7 +36,6 @@
 from datafusion._internal import DataFrame as DataFrameInternal
 from datafusion.expr import Expr, SortExpr, sort_or_default
 from enum import Enum
-from typing import Tuple
 
 
 class Compression(Enum):

src/dataframe.rs

@@ -463,7 +463,7 @@ impl PyDataFrame {
     /// Write a `DataFrame` to a Parquet file.
     #[pyo3(signature = (
         path,
-        compression="uncompressed",
+        compression="zstd",
         compression_level=None
         ))]
     fn write_parquet(