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https://issues.apache.org/jira/browse/FLINK-7922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tzu-Li (Gordon) Tai reopened FLINK-7922:
----------------------------------------

> leastRestrictive in FlinkTypeFactory does not resolve composite type correctly
> ------------------------------------------------------------------------------
>
>                 Key: FLINK-7922
>                 URL: https://issues.apache.org/jira/browse/FLINK-7922
>             Project: Flink
>          Issue Type: Bug
>          Components: Table API & SQL
>    Affects Versions: 1.4.0
>            Reporter: Rong Rong
>            Assignee: Rong Rong
>            Priority: Major
>             Fix For: 1.4.0, 1.5.0, 1.3.4
>
>
> FlinkTypeFactory does not override the following function correctly:
> {code:java}
> def leastRestrictive(types: util.List[RelDataType]): RelDataType = {
>   //... 
> }
> {code}
> dealing with SQL such as:
> {code:sql}
> CASE 
>   WHEN <CONDITION> THEN 
>     <COMPOSITE_TYPE> 
>   ELSE 
>     NULL 
> END
> {code}
> will trigger runtime exception. 
> See following test sample for more details:
> https://github.com/walterddr/flink/commit/a5f2affc9bbbd50f06200f099c90597e519e9170



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