How to reset textinputformat.record.delimiter to its default value within hive cli / beeline?

问题

Setting textinputformat.record.delimiter to a non-default value, is useful for loading multi-row text, as shown in the demo below.
However, I'm failing to set this parameter back to its default value without exiting the cli and reopen it.

None of the following options worked (nor some other trials)

set textinputformat.record.delimiter='\n';
set textinputformat.record.delimiter='\r';
set textinputformat.record.delimiter='\r\n';
set textinputformat.record.delimiter='
';

reset;

Any thought?

Thanks

Demo

create table mytable (mycol string);
insert into mytable select concat('Hello',unhex('A'),'world');    
select concat('>>>',mycol,'<<<') as mycol from mytable;

NewLine is interpreted is record delimiter, causing the insert of 2 records

+-------------+
|    mycol    |
+-------------+
| >>>Hello<<< |
| >>>world<<< |
+-------------+

---

set textinputformat.record.delimiter='\0';

truncate table mytable;
insert into mytable select concat('Hello',unhex('A'),'world');    
select concat('>>>',mycol,'<<<') as mycol from mytable;

The whole text was inserted as a single record

+----------+
|  mycol   |
+----------+
| >>>Hello |
| world    |
| <<<      |
+----------+

---

Trying to change the delimiter back to newline

set textinputformat.record.delimiter='\n';

truncate table mytable;
insert into mytable select concat('Hello',unhex('A'),'world');    
select concat('>>>',mycol,'<<<') as mycol from mytable;

Still get the same results

+----------+
|  mycol   |
+----------+
| >>>Hello |
| world    |
| <<<      |
+----------+

回答1:

Have you checked the "textinputformat.record.delimiter" variable state? Was it really changed? You could do it calling set textinputformat.record.delimiter without any value.
If it was changed, but not works, you could definitely create issue in the issue tracker. As a workaround for setting delimiter param back to default value, you could try RESET command. It would reset ALL properties to default values, though this solution could be unacceptable for your case.

回答2:

use unicode alt+A or \u0001 as delimer.

来源：https://stackoverflow.com/questions/42672451/how-to-reset-textinputformat-record-delimiter-to-its-default-value-within-hive-c