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doris/fe
yangshijie 71fd3a6b12 [feature](fe) support ANSI standard keyword for CURRENT_XXX #30550
support ANSI standard keywords:

CURRENT_DATE
CURRENT_TIME
CURRENT_TIMESTAMP
LOCALTIME
LOCALTIMESTAMP
CURRENT_USER
mysql> SELECT CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, LOCALTIME, LOCALTIMESTAMP, CURRENT_USER;
+--------------+--------------+---------------------+-----------+---------------------+--------------+
| CURRENT_DATE | CURRENT_TIME | CURRENT_TIMESTAMP   | LOCALTIME | LOCALTIMESTAMP      | CURRENT_USER |
+--------------+--------------+---------------------+-----------+---------------------+--------------+
| 2024-01-31   | 03:53:20     | 2024-01-31 03:53:20 | 03:53:20  | 2024-01-31 03:53:20 | 'root'@'%'   |
+--------------+--------------+---------------------+-----------+---------------------+--------------+
1 row in set (0.07 sec)
2024-01-31 23:53:39 +08:00
..

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# fe-common

This module is used to store some common classes of other modules.

# spark-dpp

This module is Spark DPP program, used for Spark Load function.
Depends: fe-common

# fe-core

This module is the main process module of FE.
Depends: fe-common, spark-dpp