[fix](function)fix string split function buffer overflow

[starocean999]

Proposed changes

Issue Number: close #xxx

Problem summary

Describe your changes.

Checklist(Required)

1. Does it affect the original behavior:
   • [ ] Yes
   • [x] No
   • [ ] I don't know
2. Has unit tests been added:
   • [ ] Yes
   • [x] No
   • [ ] No Need
3. Has document been added or modified:
   • [ ] Yes
   • [x] No
   • [ ] No Need
4. Does it need to update dependencies:
   • [ ] Yes
   • [x] No
5. Are there any changes that cannot be rolled back:
   • [ ] Yes (If Yes, please explain WHY)
   • [x] No

Further comments

If this is a relatively large or complex change, kick off the discussion at [email protected] by explaining why you chose the solution you did and what alternatives you considered, etc...

[morningman]

please add test case

[github-actions[bot]]

PR approved by at least one committer and no changes requested.

[github-actions[bot]]

PR approved by anyone and no changes requested.

[github-actions[bot]]

PR approved by at least one committer and no changes requested.

[dataroaring]

please add test case

I discussed it with @starocean999 , it is a problem due to memory overflow, it is difficult to find a simple case can cover it and the test pipeline is blocked, so i merged it.