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https://issues.apache.org/jira/browse/CALCITE-4297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17210248#comment-17210248
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Justin Swett commented on CALCITE-4297:
---------------------------------------
Adding a new SqlFunction parses and validates `current_datetime`, however, I'm
not sure semantically my work around is correct:
{code:java}
public static final SqlFunction CURRENT_DATETIME
= new SqlAbstractTimeFunction("CURRENT_DATETIME", SqlTypeName.TIMESTAMP);{code}
...off to look at BQ docs.
> 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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