Mysql 为什么我的；空"；tsv的日期时间条目是否转换为0000-00-00:00:00？

最近在x86_64（自制）上为osx10.15更新了mysql 8.0.19版

我正在尝试从tsv文件加载数据，以便将条目添加到现有表中。一切似乎都很正常，除了“NULL”的值（字面意思是，它不是空的）正在转换为0000-00-00:00:00。没有错误，但我确实收到警告“第2行'Beginep'列的数据被截断”

以下是我尝试过的，但没有用：

ALTER TABLE infomegatask 
ALTER beginexp SET DEFAULT NULL; # same for field 'endhit'

ALTER TABLE infomegatask MODIFY COLUMN beginexp DATETIME NULL; #even though it was already nullable to begin with when I checked the schema

#also set sql_mode="NO_ZERO_DATE"

以下是tsv外观的编辑片段（敏感数据已被掩盖）：

我的意思是，我现在要做的解决方法是将这些零日期时间更新为NULL，但这有点烦人，我只想找出哪里出了问题。

在语法中，您可以转换列

因此，在你的情况下：

  LOAD DATA
  INTO TABLE  xx ( .., @beginexp , ... )
  ...
  SET beginexp = IF(@beginexp='NULL', NULL, @beginexp),
  ...

mysql> LOAD DATA LOCAL INFILE 'test/DB/tsv/infomegatask_round_9g.tsv' INTO TABLE infomegatask FIELDS TERMINATED BY '\t' ENCLOSED BY '' LINES TERMINATED BY '\n' IGNORE 1 LINES;
Query OK, 24 rows affected, 13 warnings (0.21 sec)
Records: 24  Deleted: 0  Skipped: 0  Warnings: 13

mysql> warnings
Show warnings enabled.
mysql> show warnings
    -> ;
+---------+------+------------------------------------------------+
| Level   | Code | Message                                        |
+---------+------+------------------------------------------------+
| Warning | 1265 | Data truncated for column 'beginexp' at row 2  |
| Warning | 1265 | Data truncated for column 'endhit' at row 2    |
| Warning | 1265 | Data truncated for column 'beginexp' at row 4  |
| Warning | 1265 | Data truncated for column 'endhit' at row 4    |
| Warning | 1265 | Data truncated for column 'beginexp' at row 7  |
| Warning | 1265 | Data truncated for column 'endhit' at row 7    |
| Warning | 1265 | Data truncated for column 'beginexp' at row 9  |
| Warning | 1265 | Data truncated for column 'endhit' at row 9    |
| Warning | 1265 | Data truncated for column 'beginexp' at row 10 |
| Warning | 1265 | Data truncated for column 'endhit' at row 10   |
| Warning | 1265 | Data truncated for column 'endhit' at row 14   |
| Warning | 1265 | Data truncated for column 'beginexp' at row 20 |
| Warning | 1265 | Data truncated for column 'endhit' at row 20   |
+---------+------+------------------------------------------------+
13 rows in set (0.00 sec)

  LOAD DATA
  INTO TABLE  xx ( .., @beginexp , ... )
  ...
  SET beginexp = IF(@beginexp='NULL', NULL, @beginexp),
  ...