luoyuxia created FLINK-27014:
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Summary: Hive dialect support select null literal in subquery
Key: FLINK-27014
URL: https://issues.apache.org/jira/browse/FLINK-27014
Project: Flink
Issue Type: Improvement
Components: Connectors / Hive
Affects Versions: 1.16.0
Reporter: luoyuxia
It'll throw the exception "Unsupported type 'NULL' to get internal serializer"
with the following sql in Hive dialect
{code:java}
select count(key) from (select null as key from src)src {code}
The reason is null literal will be considered as NULL type, but there's no
serializer for NULL type. When meet such case, consider it as Varchar Type.
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