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Universe 5b0f11b665 [feature](mysql-compatibility)(function) add WEEKDAY function (#7673 )

`WEEKDAY` in MySQL: returns an index from 0 to 6 for Monday to Sunday.
`DAYOFWEEK` in MySQL: returns an index from 1 to 7 for Sunday to Saturday.

Doris only have `DAYOFWEEK` function, so I add `WEEKDAY` function.

Thanks for the following materials:
- https://github.com/apache/incubator-doris/pull/6982/files
- https://www.bilibili.com/video/BV1V44y1Y7Ro

2022-01-16 10:39:21 +08:00

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title, language

title	language
dayofweek	en

dayofweek

Description

Syntax

INT DAYOFWEEK (DATETIME date)

The DAYOFWEEK function returns the index value of the working day of the date, that is, 1 on Sunday, 2 on Monday, and 7 on Saturday.

The parameter is Date or Datetime type

example

mysql> select dayofweek('2019-06-25');
+----------------------------------+
| dayofweek('2019-06-25 00:00:00') |
+----------------------------------+
|                                3 |
+----------------------------------+

mysql> select dayofweek(cast(20190625 as date)); 
+-----------------------------------+
| dayofweek(CAST(20190625 AS DATE)) |
+-----------------------------------+
|                                 3 |
+-----------------------------------+

keyword

DAYOFWEEK

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