Context

User norrbom reported the following bug:

• Read from Parquet using pyarrow.parquet.read_table() -> pyarrow.Table
• PyMongoArrow converts Arrow to Python (via pyarrow.RecordBatch.to_pylist()). Decimal128 becomes Decimal(), which is correct
• PyMongoArrow converts Python to BSON using the Python BSON module → this is where it goes wrong; BSON cannot handle Decimal().

We should be able to handle all Parquet Logical types.

Definition of done

Add a test that reads a file containing all standard Parquet data types. Add a conversion table to our docs.

Pitfalls

Watch out for loss of precision.