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https://issues.apache.org/jira/browse/DRILL-6710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16597204#comment-16597204
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ASF GitHub Bot commented on DRILL-6710:
---------------------------------------
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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> Disallow negative scale for VarDecimal
> --------------------------------------
>
> Key: DRILL-6710
> URL: https://issues.apache.org/jira/browse/DRILL-6710
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Relational Operators
> Affects Versions: 1.14.0
> Reporter: Robert Hou
> Assignee: Sorabh Hamirwasia
> Priority: Major
> Fix For: 1.15.0
>
>
> Query is:
> select cast('999999999999999999' as decimal(18,0)) +
> cast('9999999999999999999999999999999999999' as decimal(38,0)) from data
> limit 1
> This is the error I get when my test program calls SQLExecDirect:
> The driver reported the following diagnostics whilst running SQLExecDirect
> HY000:1:40140:[MapR][Support] (40140) Scale can't be less than zero.
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