pitrou commented on pull request #9948:
URL: https://github.com/apache/arrow/pull/9948#issuecomment-817835991
So here is how inference should work IMHO:
* compute both the magnitude of most-significant digit and least-significant
digit
* examples:
* `Decimal(12345) => msd = 4, lsd = 0`
* `Decimal(12345e2) => msd = 6, lsd = 2`
* `Decimal(1234.5) => msd = 3, lsd = -1`,
* `Decimal(0.012345) => msd = -2, lsd = -6`
* `Decimal(0) => msd = -inf, lsd = +inf`
* track `max(msd)` and `min(lsd)`
* at the end, `precision = max_msd - min_lsd + 1`, `scale = -min_lsd`
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