fix: use alias as table function's column name (#10311)

[lmatz]

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- [ ] My PR contains user-facing changes.

[xxchan]

Interesting. Why compilation failed.

[xxchan]

sth changed in https://github.com/risingwavelabs/risingwave/pull/9949/files

[codecov]

Codecov Report

Merging #10405 (60dc277) into v0.19.0-rc (767cb48) will decrease coverage by 0.01%.
The diff coverage is 75.00%.

@@              Coverage Diff               @@
##           v0.19.0-rc   #10405      +/-   ##
==============================================
- Coverage       70.96%   70.96%   -0.01%     
==============================================
  Files            1231     1231              
  Lines          210978   210981       +3     
==============================================
+ Hits           149729   149731       +2     
- Misses          61249    61250       +1     

Flag	Coverage Δ
rust	70.96% <75.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
src/frontend/src/binder/relation/mod.rs	74.20% <75.00%> (-0.07%)	⬇️

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[lmatz]

Thanks for the fix!