[jira] [Created] (CALCITE-5469) Implement BigQuery DATETIME_ADD/DATETIME_DIFF

["Tanner Clary (Jira)" <ji...@apache.org>]

Tanner Clary created CALCITE-5469:
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             Summary: Implement BigQuery DATETIME_ADD/DATETIME_DIFF
                 Key: CALCITE-5469
                 URL: https://issues.apache.org/jira/browse/CALCITE-5469
             Project: Calcite
          Issue Type: Sub-task
            Reporter: Tanner Clary
            Assignee: Tanner Clary


Add support for BigQuery's {{DATETIME_ADD/DATETIME_DIFF}} functions.

{{DATETIME_ADD(datetime, interval)}} can accept a timestamp (or a datetime, which is an alias for timestamp) for its first argument and an interval for its second. The output is the datetime that occurs {{interval}} after the provided {{datetime}}.

{{DATETIME_DIFF(datetime, datetime2, timeUnit)}} returns the whole number of {{timeUnit}} between {{datetime}} and {{datetime2}}, with the result being negative if {{datetime}} occurs before {{datetime2}}

Examples:
{{DATETIME_ADD(TIMESTAMP '2008-12-25 15:30:00', INTERVAL 5 MINUTE)}} would return: '2008-12-25 15:35:00'.

{{DATETIME_DIFF(DATETIME '2008-12-25 15:30:00', DATETIME '2008-12-26 15:30:00', DAY)}} would return: -1.



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