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https://issues.apache.org/jira/browse/CALCITE-4297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17209830#comment-17209830
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Julian Hyde edited comment on CALCITE-4297 at 10/7/20, 8:14 PM:
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This is duplicate of CALCITE-1766, which added 
{{SqlConformance.allowNiladicParentheses()}}. Maybe the value needs to be 
changed for {{SqlConformanceEnum.BIG_QUERY}}.

Maybe the value should be changed from boolean to Optionality (mandatory, 
optional, ignored, forbidden).

Lastly, we do not have the CURRENT_DATETIME function. We should add it as 
BigQuery-specific.


was (Author: julianhyde):
This is duplicate of CALCITE-1766, which added 
{{SqlConformance.allowNiladicParentheses()}}. Maybe the value needs to be 
changed for {{SqlConformanceEnum.BIG_QUERY}}.

Maybe the value should be changed from boolean to Optionality (mandatory, 
optional, ignored, forbidden).

> Babel should accept CURRENT_DATE and CURRENT_DATETIME, with and without 
> parentheses
> -----------------------------------------------------------------------------------
>
>                 Key: CALCITE-4297
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4297
>             Project: Calcite
>          Issue Type: Bug
>          Components: babel
>    Affects Versions: 1.25.0
>            Reporter: Justin Swett
>            Priority: Major
>
> The following BigQuery SQL contains CURRENT_DATE and CURRENT_DATETIME without 
> parentheses. Babel parser should accept it. (It should also accept 
> CURRENT_TIME and CURRENT_TIMESTAMP with parentheses.)
>  
> The following SQL should trigger *CalciteContextException: No match found for 
> function signature CURRENT_TIMESTAMP()* for the date functions, or if you add 
> parens to the current_time.
>  
> {code:java}
> WITH THE_TIMES_ARE_STATIC AS
> (SELECT
>     CURRENT_DATE as a_date,
>     CURRENT_DATETIME() as a_datetime,
>     CURRENT_TIME as a_time,
>     CURRENT_TIMESTAMP() as a_timestamp
> )
> SELECT * FROM THE_TIMES_ARE_STATIC 
> {code}



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