Arina Ielchiieva created CALCITE-1124:
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             Summary: Add support for timestampadd / timestampdiff functions
                 Key: CALCITE-1124
                 URL: https://issues.apache.org/jira/browse/CALCITE-1124
             Project: Calcite
          Issue Type: Improvement
          Components: core
    Affects Versions: next
            Reporter: Arina Ielchiieva
            Assignee: Julian Hyde


When calling timestampadd / timestampdiff with first parameter:

MICROSECOND (MICROSECONDS, FRAC_SECOND (deprecated)), (SQL_TSI_)SECOND, 
(SQL_TSI_)MINUTE, (SQL_TSI_)HOUR, (SQL_TSI_)DAY, 
(SQL_TSI_)WEEK,(SQL_TSI_)MONTH, (SQL_TSI_)QUARTER, (SQL_TSI_)YEAR

(ex: timestampadd(second, 1, current_datetime), calcite throws an error:

Caused by: org.apache.calcite.sql.parser.SqlParseException: Encountered "( 
SECOND" at line 1, column 25.
Was expecting one of:
    "(" "*" ...
    "(" ")" ...
    "(" "WITH" ...



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