shauryachats opened a new pull request, #15052:
URL: https://github.com/apache/pinot/pull/15052
A bug exists in GAPFILL queries. Aliased columns in subqueries within
GAPFILL are not correctly referenced, causing a `NullPointerException` to be
thrown. This issue happens for almost all types of GAPFILL queries
(`AGGREGATE_GAPFILL`, `AGGREGATE_GAPFILL_AGGREGATE`, `SELECT_GAPFILL`).
Example query:
```
SELECT time_bucket,
count(*)
from (
SELECT GAPFILL(
alias_created_at_timestamp,
'1:SECONDS:SIMPLE_DATE_FORMAT:yyyy-MM-dd HH:mm:ss',
'2018-01-01 11:00:00',
'2018-01-02 12:00:00',
'1:HOURS',
FILL(0, 'FILL_DEFAULT_VALUE'),
TIMESERIESON(alias_type)
) as time_bucket,
cnt,
alias_type
from (
select DATETIMECONVERT(
created_at_timestamp,
'1:MILLISECONDS:EPOCH',
'1:SECONDS:SIMPLE_DATE_FORMAT:yyyy-MM-dd HH:mm:ss',
'1:HOURS'
) as alias_created_at_timestamp,
cast(type as varchar) as alias_type,
count(*) as cnt
from githubComplexTypeEvents
group by 1,
2
order by 3 desc
limit 1000
)
limit 20000
)
group by 1
```
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