Mryange opened a new pull request, #40869:
URL: https://github.com/apache/doris/pull/40869
## Proposed changes
```
mysql [(none)]>select replace_empty('你a好b世c界','','b');
+-------------------------------------------+
| replace_empty('你a好b世c界', '', 'b') |
+-------------------------------------------+
| b�b�b�bab�b�b�bbb�b�b�bcb�b�b�b |
+----------------------------
mysql [(none)]>select replace_empty('你a好b世c界','','b');
+-------------------------------------------+
| replace_empty('你a好b世c界', '', 'b') |
+-------------------------------------------+
| b你bab好bbb世bcb界b |
+-------------------------------------------+
```
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