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https://issues.apache.org/jira/browse/FLINK-27014?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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luoyuxia updated FLINK-27014:
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Summary: Fix select null literal in subquery for Hive dialect (was: Fix
select null literal in subquery Hive dialect)
> Fix select null literal in subquery for Hive dialect
> -----------------------------------------------------
>
> Key: FLINK-27014
> URL: https://issues.apache.org/jira/browse/FLINK-27014
> Project: Flink
> Issue Type: Sub-task
> Components: Connectors / Hive
> Affects Versions: 1.16.0
> Reporter: luoyuxia
> Assignee: luoyuxia
> Priority: Major
>
> 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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