Open xcharleslin opened 1 year ago
Somewhat related, currently impl From<PrimitiveType> for DataType
has this https://github.com/jorgecarleitao/arrow2/blame/8ee5ad8c774e7355218376caf73d94bce2a769a6/src/datatypes/mod.rs#L493-L494
Int128 => Decimal(32, 32),
Int256 => Decimal256(32, 32),
Would Decimal(32, 32) only support 0.000000 to 0.999999?
Also, would more precision be required to support Int128 and Int256? The maximum values for these are 39 and 78 digits long respectively (although it seems PyArrow only supports 38 and 76 for some reason).
Int128 => Decimal(38, 0),
Int256 => Decimal256(76, 0),
Analogous to https://github.com/apache/arrow-rs/issues/1785.
Currently, Arrow2 Decimal and Decimal256 have scale typed as
usize
, which would not support negative scale.As a driveby, precision is also currently typed as
usize
but could probably be typed asu8
. It seems the max value for precision on pyarrow is 76.