Set the chunk number cap to 200

To avoid OSError when writing large files, the chunk number is capped at
200. This number comes from the maximum number of open files allowed by
macOS.

pytd/writer.py

@@ -450,11 +450,13 @@ def write_dataframe(
                 fps.append(fp)
             elif fmt == "msgpack":
                 _replace_pd_na(dataframe)
-
+                num_rows = len(dataframe)
+                # chunk number of records should not exceed 200 to avoid OSError
+                _chunk_record_size = max(chunk_record_size, num_rows//200)
                 try:
-                    for start in range(0, len(dataframe), chunk_record_size):
+                    for start in range(0, num_rows, _chunk_record_size):
                         records = dataframe.iloc[
-                            start : start + chunk_record_size
+                            start : start + _chunk_record_size
                         ].to_dict(orient="records")
                         fp = tempfile.NamedTemporaryFile(
                             suffix=".msgpack.gz", delete=False