vvysotskyi commented on a change in pull request #1451: DRILL-6710: Disallow
negative scale for VarDecimal
URL: https://github.com/apache/drill/pull/1451#discussion_r213951578
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/types/decimal/DecimalScalePrecisionModFunction.java
##########
@@ -40,5 +40,6 @@ public void computeScalePrecision(int leftPrecision, int
leftScale, int rightPre
// Output precision should atleast be greater or equal to the input
precision
outputPrecision = Math.max(outputPrecision, Math.max(leftPrecision,
rightPrecision));
Review comment:
It was a comment which described older behavior. After deprecating old
decimal types, there was no need in determining the range, so it was replaced
with `DRILL_REL_DATATYPE_SYSTEM.getMaxNumericPrecision()`. But we cannot return
precision greater than maxNumericPrecision. Or we can try to use formula from
SQL Server implementation:
```
min(p1-s1, p2 -s2) + max( s1,s2 )
```
But again, add `Math.min(DRILL_REL_DATATYPE_SYSTEM.getMaxNumericPrecision(),
outputPrecision)` to be sure that the value is not greater than
maxNumericPrecision.
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