sohami commented on a change in pull request #1451: DRILL-6710: Disallow
negative scale for VarDecimal
URL: https://github.com/apache/drill/pull/1451#discussion_r213928418
##########
File path:
exec/java-exec/src/main/codegen/templates/Decimal/DecimalFunctions.java
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@@ -170,6 +170,8 @@ public void eval() {
left.precision, left.scale,
right.precision, right.scale);
+ // Do the verification of computed scale and precision here based on
actual data
+ typeInference.verifyScaleAndPrecision();
Review comment:
I don't see moving the verification check here rather than doing in planning
time helps. Since for each addition call we still increase the precision by 1,
hence for 39 such additions precision will go beyond max allowed 38 and scale
will become -1, hence throwing the error.
I think instead what we can do is while passing `MathContext` to BigDecimal
pass `adjusted precision` and `Math.max(0, adjusted_scale).` This will ensure
that negative scale is never passed in context and if the operation is not
possible in BigDecimal under given MathContext, it should throw Exception which
Drill can in turn throw.
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