product · inferred from evidence
Parquet
A file format used for serializing DataFrames, which could not carry DATETIME values in this context.
- BigQuery load_table_from_dataframe mangles DATETIME values (INVALID or wrong dates)
This was a real backend limitation: Parquet uploads couldnt carry DATETIME values, so the client mapped `datetime64[ns]` to TIMESTAMP and values got mangled or forced to UTC. The BigQuery team later fixed the backend bug, but at the time th