[jira] [Created] (CALCITE-2995) Add the DAYNAME，MONTHNAME function

[Forward Xu (JIRA)]

Forward Xu created CALCITE-2995:
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             Summary: Add the DAYNAME，MONTHNAME function
                 Key: CALCITE-2995
                 URL: https://issues.apache.org/jira/browse/CALCITE-2995
             Project: Calcite
          Issue Type: New Feature
            Reporter: Forward Xu


MONTHNAME(date)
 Returns the full name of the month for date. The language used for the name is 
controlled by the value of the lc_time_names system variable.

SQL:
{code:java}
SELECT MONTHNAME('2018-01-01') monthname;{code}
Result:
||monthname||
|January|

DAYNAME(date)
 Returns the name of the weekday for date. The language used for the name is 
controlled by the value of the lc_time_names system variable.

SQL:
{code:java}
SELECT DAYNAME('2018-01-01') dayname;{code}
Result:
||dayname||
|Monday|



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