yangzhg opened a new issue #3332: [BUG] doris string functions not support cjk characters URL: https://github.com/apache/incubator-doris/issues/3332 **Describe the bug** doris string functions cannot handle utf-8 strings，such as substr will using byte pos not character pos **To Reproduce**  **Expected behavior** mysql can handle multibytes correctly  **Screenshots** If applicable, add screenshots to help explain your problem. **Additional context** it because src/exprs/string_functions.cpp not support multibyte string
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