dang-stripe opened a new issue, #14911:
URL: https://github.com/apache/pinot/issues/14911
We're getting non-deterministic NPEs on a null-enabled query that looks like
this.
```
set enableNullHandling = true;
select m_id,
sum(
case
when outcome = 'success' then 1
else 0
end
) as success,
sum(
case
when outcome = 'failed' then 1
else 0
end
) as failed,
sum(
case
when outcome = 'invalid' then 1
else 0
end
) as invalid,
from example_table
where
some_filter_condition = 'value'
group by 1
order by (success + failed + invalid) desc
```
Unfortunately, there's no stacktrace in the failure.
```
[2025-01-21 22:50:01.843739] ERROR [BaseCombineOperator] [pqw-92:90] Caught
exception while processing query:
QueryContext{_tableName='example_table_REALTIME', _subquery=null,
_selectExpressions=[m_id, sum(case(equals(outcome,'success'),'1','0')),
sum(case(equals(outcome,'failed'),'1','0')),
sum(case(equals(outcome,'invalid'),'1','0'))], _distinct=false,
_aliasList=[null, success, failed, invalid], _filter=(some_filter_condition =
'value'), _groupByExpressions=[m_id], _havingFilter=null,
_orderByExpressions=null, _limit=10, _offset=0,
_queryOptions={enableNullHandling=true}, _expressionOverrideHints={},
_explain=false} [2025-01-21 22:50:01.843748] java.lang.NullPointerException:
null
```
Switching it to use `COUNT(*) FILTER` instead of sum/case/when works
reliably.
```
COUNT(*) FILTER (WHERE outcome = 'success') as success,
COUNT(*) FILTER (WHERE outcome = 'failed') as failed,
COUNT(*) FILTER (WHERE outcome = 'invalid') as invalid,
```
I've also confirmed there's no null values for the `outcome` field.
cc @Jackie-Jiang
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