Ted-Jiang commented on issue #9566:
URL:
https://github.com/apache/arrow-datafusion/issues/9566#issuecomment-1990142219
@alamb some situation like will block
```
❯ SELECT sum(t)
FROM
(SELECT null AS t)
;
Error during planning: No function matches the given name and argument types
'SUM(Null)'. You might need to add explicit type casts.
Candidate functions:
SUM(Int8/Int16/Int32/Int64/UInt8/UInt16/UInt32/UInt64/Float32/Float64)
```
subquery return null value without type referenece.
this work fine in spark-sql:
```
spark-sql (default)> SELECT sum(t)
> FROM
> (SELECT null AS t)
> ;
NULL
```
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