jacktengg opened a new pull request, #18878:
URL: https://github.com/apache/doris/pull/18878
# Proposed changes
Issue Number: close #xxx
## Problem summary
Support function `VARCHAR char(INT,..., [USING charset_name])`.
Interprets each argument as an integer and returns a string consisting of
the characters given by the code values of those integers. `NULL` values are
skipped.
If the result string is illegal for the given character set, the result from
`CHAR()` becomes `NULL`.
Arguments larger than `255` are converted into multiple result bytes. For
example, `char(15049882)` is equivalent to `char(229, 164, 154)`.
Currently only `utf8` is supported for `charset_name`.
```
mysql> select char(68, 111, 114, 105, 115);
+--------------------------------------+
| char('utf8', 68, 111, 114, 105, 115) |
+--------------------------------------+
| Doris |
+--------------------------------------+
mysql> select char(15049882, 15179199, 14989469);
+--------------------------------------------+
| char('utf8', 15049882, 15179199, 14989469) |
+--------------------------------------------+
| 多睿丝 |
+--------------------------------------------+
mysql> select char(255);
+-------------------+
| char('utf8', 255) |
+-------------------+
| NULL |
+-------------------+
```
## Checklist(Required)
* [ ] Does it affect the original behavior
* [ ] Has unit tests been added
* [ ] Has document been added or modified
* [ ] Does it need to update dependencies
* [ ] Is this PR support rollback (If NO, please explain WHY)
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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