handle case when schema is passed to from_pandas

Signed-off-by: Nikolay Ulmasov <[email protected]>

python/deltalake/writer.py

@@ -161,6 +161,9 @@ def write_deltalake(
         partition_filters: the partition filters that will be used for partition overwrite.
         large_dtypes: If True, the table schema is checked against large_dtypes
     """
+    if isinstance(schema, Schema):
+        schema = schema.to_pyarrow()
+
     if _has_pandas and isinstance(data, pd.DataFrame):
         if schema is not None:
             data = pa.Table.from_pandas(data, schema=schema)
@@ -180,8 +183,6 @@ def write_deltalake(
             raise ValueError("You must provide schema if data is Iterable")
         else:
             schema = data.schema
-    elif isinstance(schema, Schema):
-        schema = schema.to_pyarrow()
 
     if filesystem is not None:
         raise NotImplementedError("Filesystem support is not yet implemented.  #570")