[Bug] errCode = 2, detailMessage = errCode = 2, detailMessage = date literal [2020-03-06] is invalid

[morningman]

Describe the bug
Error thrown when executing load statement.

To Reproduce

CREATE TABLE `app_profile` (
  `event_date` date NOT NULL COMMENT "",
  `app_name` varchar(64) NOT NULL COMMENT "",
  `package_name` varchar(64) NOT NULL COMMENT "",
  `age` varchar(32) NOT NULL COMMENT "",
  `gender` varchar(32) NOT NULL COMMENT "",
  `level` varchar(64) NOT NULL COMMENT "",
  `city` varchar(64) NOT NULL COMMENT "",
  `model` varchar(64) NOT NULL COMMENT "",
  `brand` varchar(64) NOT NULL COMMENT "",
  `hours` varchar(16) NOT NULL COMMENT "",
  `use_num` int(11) SUM NOT NULL COMMENT "",
  `use_time` double SUM NOT NULL COMMENT "",
  `start_times` bigint(20) SUM NOT NULL COMMENT ""
) ENGINE=OLAP
AGGREGATE KEY(`event_date`, `app_name`, `package_name`, `age`, `gender`, `level`, `city`, `model`, `brand`, `hours`)
COMMENT "OLAP"
PARTITION BY RANGE(`event_date`)
(PARTITION p_20200301 VALUES [('2020-02-27'), ('2020-03-02')),
PARTITION p_20200306 VALUES [('2020-03-02'), ('2020-03-07')))
DISTRIBUTED BY HASH(`event_date`, `app_name`, `package_name`, `age`, `gender`, `level`, `city`, `model`, `brand`, `hours`) BUCKETS 32
PROPERTIES (
 "replication_num" = "1"
);

load label db1.app_profile_20200306 ( DATA INFILE('filexxx') INTO TABLE app_profile partition (p_20200306) COLUMNS TERMINATED BY '\t' (app_name,package_name,age,gender,level,city,model,brand,hours,use_num,use_time,start_times) SET ( event_date = default_value('2020-03-06') ) ) PROPERTIES ( 'max_filter_ratio'='0.0001' );

Sometimes it will throw:

errCode = 2, detailMessage = errCode = 2, detailMessage = date literal [2020-03-06] is invalid

Why

This is because here:

https://github.com/apache/incubator-doris/blob/be090f5929c3ed866af9a8789b2008ae4dc7e921/fe/src/main/java/org/apache/doris/analysis/DateLiteral.java#L194

the if clause return false, even if the type is truly DATE, but equals() will return true.

I really do not know why, it should be return true by using ==, because we never create the
new instance of Type.DATE, but to reference the static member in Type.