yanyxin commented on PR #29799:
URL: https://github.com/apache/doris/pull/29799#issuecomment-2247399654
> > > 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
Substring (VARCHAR str, INT pos, [INT len]), so when pos exceeds the length
of str, is the correct result null? However, 2.1.5 is currently not available；
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