kou commented on code in PR #40434:
URL: https://github.com/apache/arrow/pull/40434#discussion_r1525658585
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cpp/src/gandiva/decimal_type_util.cc:
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@@ -29,8 +29,11 @@ constexpr int32_t DecimalTypeUtil::kMinAdjustedScale;
}
// Implementation of decimal rules.
+// In addition to having a precision beyond 38, it is compatible with
+// **Redshift's decimal promotion rules** if enable use_redshift_rules.
Review Comment:
Could you use "our compute module's ... rules (which is compatible with the
Redshift's ... rules)" or something to be clear?
And could you add the URL that describes the rules?
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cpp/src/gandiva/decimal_type_util.cc:
##########
@@ -59,7 +62,8 @@ Status DecimalTypeUtil::GetResultType(Op op, const
Decimal128TypeVector& in_type
break;
case kOpDivide:
- result_scale = std::max(kMinAdjustedScale, s1 + p2 + 1);
+ result_scale = use_redshift_rules ? std::max(4, s1 + p2 - s2 + 1)
Review Comment:
Can we define a named constant instead of using magic number `4` directly?
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