Tanner Clary created CALCITE-6021:
-------------------------------------

             Summary: Add CURRENT_DATETIME function (enabled in BigQuery 
library)
                 Key: CALCITE-6021
                 URL: https://issues.apache.org/jira/browse/CALCITE-6021
             Project: Calcite
          Issue Type: Bug
            Reporter: Tanner Clary


Calcite supports parsing and validation for the CURRENT_DATETIME function 
according to CALCITE-4297 . However a native implementation was never added.

The docs for the function may be found here: 
 
https://cloud.google.com/bigquery/docs/reference/standard-sql/datetime_functions#current_datetime

An example:
{{SELECT CURRENT_DATETIME([timezone])}} should return the current time as a 
{{DATETIME}} (a Calcite TIMESTAMP_WITH_LOCAL_TIME_ZONE). There is an optional 
time zone argument.



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