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https://issues.apache.org/jira/browse/CALCITE-3217?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xurenhe updated CALCITE-3217:
-----------------------------
    Description: 
 

Should Calcite need to support "select null", such as:
{code:java}
//代码占位符
select null;{code}
In the version of "1.20.0", it throws exception in 
`org.apache.calcite.sql.validate.SqlValidatorImpl#inferUnknownTypes`. 

 

  was:
 

Should Calcite need to support null column, such as:
{code:java}
//代码占位符
select null{code}
In the version of "1.20.0", it throws exception in 
`org.apache.calcite.sql.validate.SqlValidatorImpl#inferUnknownTypes`. 

 


> Should  Calcite support "select null"?
> --------------------------------------
>
>                 Key: CALCITE-3217
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3217
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Xurenhe
>            Priority: Minor
>
>  
> Should Calcite need to support "select null", such as:
> {code:java}
> //代码占位符
> select null;{code}
> In the version of "1.20.0", it throws exception in 
> `org.apache.calcite.sql.validate.SqlValidatorImpl#inferUnknownTypes`. 
>  



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