fix:[2.5]GrowingDataGetter get the wrong string data

[cqy123456]

issue: #37994
master pr: #38015
2.4 pr: #37995

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.03%. Comparing base (c35045e) to head (84b88ef).
Report is 4 commits behind head on 2.5.

Files with missing lines	Patch %	Lines
.../src/exec/operator/groupby/SearchGroupByOperator.h	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #38016      +/-   ##
==========================================
- Coverage   81.04%   81.03%   -0.01%     
==========================================
  Files        1360     1360              
  Lines      190664   190665       +1     
==========================================
- Hits       154515   154508       -7     
- Misses      30655    30656       +1     
- Partials     5494     5501       +7     

Components	Coverage Δ
Client	72.16% <ø> (ø)
Core	68.87% <50.00%> (-0.01%)	⬇️
Go	83.20% <ø> (-0.01%)	⬇️

Files with missing lines	Coverage Δ
.../src/exec/operator/groupby/SearchGroupByOperator.h	80.88% <50.00%> (-1.21%)	⬇️

... and 31 files with indirect coverage changes

[mergify]

@cqy123456 E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[cqy123456]

/run-cpu-e2e

[cqy123456]

/run-cpu-e2e