decimal128(int precision, int scale=0) → DataType¶
Create decimal type with precision and scale and 128-bit width.
Arrow decimals are fixed-point decimal numbers encoded as a scaled integer. The precision is the number of significant digits that the decimal type can represent; the scale is the number of digits after the decimal point (note the scale can be negative).
As an example,
decimal128(7, 3)can exactly represent the numbers 1234.567 and -1234.567 (encoded internally as the 128-bit integers 1234567 and -1234567, respectively), but neither 12345.67 nor 123.4567.
decimal128(5, -3)can exactly represent the number 12345000 (encoded internally as the 128-bit integer 12345), but neither 123450000 nor 1234500.
If you need a precision higher than 38 significant digits, consider using
precision (int) – Must be between 1 and 38
scale (int) –