Function builtin_write_parquet 

fn builtin_write_parquet(
    args: &[RValue],
    named: &[(String, RValue)],
    context: &BuiltinContext<'_>,
) -> Result<RValue, RError>

Write a data.frame to a Parquet file.

Converts R vectors to Arrow column types:

• Logical -> Boolean
• Integer -> Int64
• Double -> Float64
• Character -> Utf8

@param x data.frame to write @param file character scalar: output file path @return NULL (invisibly)