bkietz commented on a change in pull request #10364:
URL: https://github.com/apache/arrow/pull/10364#discussion_r646714303
##########
File path: docs/source/cpp/compute.rst
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@@ -286,11 +286,29 @@ an ``Invalid`` :class:`Status` when overflow is detected.
+--------------------------+------------+--------------------+---------------------+
| power_checked | Binary | Numeric | Numeric
|
+--------------------------+------------+--------------------+---------------------+
-| subtract | Binary | Numeric | Numeric
|
+| subtract | Binary | Numeric | Numeric (1)
|
+--------------------------+------------+--------------------+---------------------+
-| subtract_checked | Binary | Numeric | Numeric
|
+| subtract_checked | Binary | Numeric | Numeric (1)
|
+--------------------------+------------+--------------------+---------------------+
+* \(1) Precision and scale of computed DECIMAL results
+
++------------+---------------------------------------------+
+| Operation | Result precision and scale |
++============+=============================================+
+| | add | | scale = max(s1, s2) |
+| | subtract | | precision = max(p1-s1, p2-s2) + 1 + scale |
++------------+---------------------------------------------+
+| multiply | | scale = s1 + s2 |
+| | | precision = p1 + p2 + 1 |
++------------+---------------------------------------------+
+| divide | | scale = max(4, s1 + p2 - s2 + 1) |
+| | | precision = p1 - s1 + s2 + scale |
Review comment:
Ah, I see. Thanks
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