Mehant Baid created DRILL-2870:
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Summary: Fix return type of aggregate functions to be nullable
Key: DRILL-2870
URL: https://issues.apache.org/jira/browse/DRILL-2870
Project: Apache Drill
Issue Type: Bug
Reporter: Mehant Baid
Assignee: Mehant Baid
Priority: Critical
Fix For: 1.0.0
The output type of aggregate functions is required if the input is required
which does not always hold true. Consider the case where input is a required
type and we are performing sum(), however if all the rows are filtered out then
we should return null instead of 0. This holds true for all aggregate functions
(except count).
As part of DRILL-2277 we are fixing the case when we have an aggregate function
(without group by) and the input batch is empty we still need to produce one
record with null as output (count function is an exception to this). If we
don't fix the return type of aggregate functions then we will return wrong
results in the case where we have an empty input with required columns.
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