Write video blobs as is in parquet (#7976)

* plain encoding, uncompressed, no dict for videos in parquet

* style

Author: lhoestq

src/datasets/io/parquet.py

@@ -7,6 +7,7 @@
 
 from .. import Dataset, Features, NamedSplit, config
 from ..arrow_writer import get_writer_batch_size_from_data_size, get_writer_batch_size_from_features
+from ..features.features import require_storage_embed
 from ..formatting import query_table
 from ..packaged_modules import _PACKAGED_DATASETS_MODULES
 from ..packaged_modules.parquet.parquet import Parquet
@@ -126,6 +127,16 @@ def _write(self, file_obj: BinaryIO, batch_size: int, **parquet_writer_kwargs) -
             schema=schema,
             use_content_defined_chunking=self.use_content_defined_chunking,
             write_page_index=self.write_page_index,
+            compression={
+                col: "none" if require_storage_embed(feature) else "snappy"
+                for col, feature in self.dataset.features.items()
+            },
+            use_dictionary=[
+                col for col, feature in self.dataset.features.items() if not require_storage_embed(feature)
+            ],
+            column_encoding={
+                col: "PLAIN" for col, feature in self.dataset.features.items() if require_storage_embed(feature)
+            },
             **parquet_writer_kwargs,
         )