Apply J1939 metadata parsing also on proprietary frames

- Exclude non-J1939 frames (such as 11 bit IDs) by writing null on their
  metadata struct

decoder.py

@@ -3,14 +3,12 @@ import polars as pl
 
 def get_j1939_mask() -> pl.Expr:
     """
-    Returns a Polars expression representing the strict J1939 filtering rules.
+    Returns a Polars expression representing the J1939 filtering rules.
+    Updated to include all 29-bit extended frames, including proprietary ones
+    (which have the Data Page bit set to 1) and CAN FD frames.
     """
     id_int = pl.col("ID").str.to_integer(base=16).cast(pl.UInt32)
-    return (
-        (id_int > 0x7FF) &
-        ((id_int % 33554432 // 16777216) == 0) &
-        (pl.col("DLC") <= 8)
-    )
+    return id_int > 0x7FF
 
 def decode_j1939_metadata(lf: pl.LazyFrame) -> pl.LazyFrame:
     """
@@ -44,7 +42,7 @@ def decode_j1939_metadata(lf: pl.LazyFrame) -> pl.LazyFrame:
 def decode_j1939_frames(df: pl.DataFrame) -> pl.DataFrame:
     id_int = pl.col("ID").str.to_integer(base=16).cast(pl.UInt32)
 
-    is_j1939 = (id_int > 0x7FF) & ((id_int % 33554432 // 16777216) == 0) & (pl.col("DLC") <= 8)
+    is_j1939 = id_int > 0x7FF
 
     priority = (id_int // 67108864) % 8
     pf = (id_int // 65536) % 256
@@ -64,10 +62,13 @@ def decode_j1939_frames(df: pl.DataFrame) -> pl.DataFrame:
         ])
     ).otherwise(None)
 
+    return df.with_columns(j1939_meta.alias("j1939_metadata"))
+
+
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(description="J1939 decoder")
     parser.add_argument("input_parquet", help="Path to the raw .parquet file")
-    parser.add_argument("output_parquet", help="Path to save the decoded .parquet file")
+    parser.add_argument("output_paquet", help="Path to save the decoded .parquet file")
     args = parser.parse_args()
 
     df = pl.scan_parquet(args.input_parquet).collect()