BiteTheDDDDt commented on PR #29799:
URL: https://github.com/apache/doris/pull/29799#issuecomment-2247362184
> > The code 2.1.5 and master in this regard should be the same. Can you
provide a specific example to illustrate the problem of wrong results?
>
> select substr('老人年轻并不等于动的金币第七十二',17); The result of executing 2.0.13 is
null，2.1.5 The result is '老人年轻并不等于动的金币第七十二'，Due to the presence of
fixed_pos>index.size() in line 247 of the function_string. h file in 2.0.13,
but not in branch 2.1.5, 2.0.13 is consistent with master
this behavior is changed by #28352, so I think 2.1 is same with master, and
2.0 still remained old behavior
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