String Func: repeat/substring/substr/mid

[Veeupup]

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

Summary

string func:

• repeat
• substring
• mid
• substr
• substring_index

Changelog

• Improvement

Related Issues

Fixes #issue

Test Plan

Unit Tests

Stateless Tests

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[sundy-li]

@mergify update

[mergify]

update

✅ Branch has been successfully updated

Hey, I reacted but my real name is @Mergifyio

[codecov-commenter]

Codecov Report

Merging #4102 (306b83b) into main (c04dca4) will increase coverage by 0%.
The diff coverage is 38%.

@@          Coverage Diff           @@
##            main   #4102    +/-   ##
======================================
  Coverage     57%     57%            
======================================
  Files        856     856            
  Lines      46510   46300   -210     
======================================
- Hits       26679   26633    -46     
+ Misses     19831   19667   -164     

Impacted Files	Coverage Δ
...n/functions/src/scalars/strings/substring_index.rs	5% <6%> (+3%)	⬆️
common/functions/src/scalars/strings/repeat.rs	9% <8%> (+3%)	⬆️
common/functions/src/scalars/strings/substring.rs	78% <84%> (+35%)	⬆️
common/functions/src/scalars/strings/string.rs	98% <100%> (ø)
common/datavalues/src/arrays/string/builder.rs	43% <0%> (-13%)	⬇️
query/src/common/mod.rs	76% <0%> (-8%)	⬇️
common/datavalues/src/arrays/comparison.rs	6% <0%> (-5%)	⬇️
common/functions/src/scalars/function2_factory.rs	91% <0%> (-1%)	⬇️
...nctions/src/scalars/comparisons/comparison_like.rs	52% <0%> (-1%)	⬇️
common/datavalues/src/arrays/primitive/mod.rs	38% <0%> (-1%)	⬇️
... and 4 more

---

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[sundy-li]

Good job, almost -300 LOC