Paul Rogers created DRILL-6378:
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Summary: MajorType passed into UDF with FieldReader has unset
prec, scale for DECIMAL
Key: DRILL-6378
URL: https://issues.apache.org/jira/browse/DRILL-6378
Project: Apache Drill
Issue Type: Bug
Affects Versions: 1.13.0
Reporter: Paul Rogers
UDFs allow passing in a generic {{FieldReader}} such as for the {{typeof}}
function. I tried to modify the new {{sqlTypeOf()}} function to include the
DECIMAL precision and scale, something like: {{DECIMAL(9, 2)}}.
But, the {{MajorType}} associated with the {{FieldReader}} has these values as
0. Not sure if it is because the DECIMAL is the result of a cast, or if there
is a deeper bug.
Query:
{noformat}
ALTER SESSION SET `planner.enable_decimal_data_type` = true;
SELECT sqlTypeof(CAST(a AS DECIMAL)) FROM (VALUES (1)) AS T(a);
{noformat}
Debug information for the {{MajorType}}
{noformat}
type TypeProtos$MajorType (id=151)
precision_ 0
scale_ 0
{noformat}
This bug is not simply a nuisance for formatting. The precision and scale are
required to make sense of any {{DECIMAL}} values that the function wants to
process: without these values, the function does not know the meaning of the
{{DECIMAL}} data.
Once this bug is fixed, reenable the type suffix code in
{{UnionFunctions.extendType()}}.
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