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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/04/12 13:59:22 UTC

[GitHub] [arrow] pitrou commented on pull request #9948: ARROW-12150: [Python] Correctly infer type of mixed-precision Decimals

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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