Add LOAD INTO VALUES

[nnsgmsone]

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #9955

What this PR does / why we need it:

Provide a quick way to insert data, example is as follows:

load data  inline format='csv', data='1\n2\n' into table t1;

load data  inline format='csv', data=$XXX$
1
2
$XXX$ 
into table t1;

[fengttt]

Need more tests.

Esp data with ' in it. Make sure quote works. Make sure $XXX$ syntax works.

$XXX$ 
one line
another line
$XXX$ 

[nnsgmsone]

Need more tests.

Esp data with ' in it. Make sure quote works. Make sure $XXX$ syntax works.

$XXX$ 
one line
another line
$XXX$ 

$xxx$是什么意思呢？是下面这个行为吗。。

mysql>  load data  inline format='csv', data='"1"\n"2"\n$XXX$' into table t1;
Query OK, 3 rows affected (0.01 sec)

mysql> select * from t1;
+-------+
| a     |
+-------+
| 1     |
| 2     |
| $XXX$ |
+-------+
3 rows in set (0.01 sec)

@fengttt

[nnsgmsone]

逻辑上load data inline format='csv', data='1\n2\n' into table t1中的data必须是一个满足mysql定义的字符串。就是词法解析阶段定义的一个string @fengttt

[fengttt]

load data  inline format='csv', data=$XXX$
1
2
$XXX$ 
into table t1;

[nnsgmsone]

没有'吗。。不是下面这样吗?

load data  inline format='csv', data='$XXX$
1
2
$XXX$' 
into table t1;

@fengttt 如果没有'的话，那个可能没那么简单处理，有的话，现在就支持的，我多加一些test case即可。。