test(streaming): fix order assumption in extreme_null

[BugenZhao]

Signed-off-by: Bugen Zhao [email protected]

What's changed and what's your intention?

We have no assumption about the order of inserted rows.

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests

Refer to a related PR or issue link (optional)

• https:/singularity-data/risingwave/runs/5970211767?check_suite_focus=true

[codecov]

Codecov Report

Merging #1770 (61f1fcc) into main (a933494) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1770   +/-   ##
=======================================
  Coverage   71.15%   71.15%           
=======================================
  Files         601      601           
  Lines       77950    77950           
=======================================
+ Hits        55466    55469    +3     
+ Misses      22484    22481    -3     

Flag	Coverage Δ
rust	71.15% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/common/src/types/ordered_float.rs	23.70% <0.00%> (+0.19%)	⬆️
src/connector/src/filesystem/file_common.rs	80.80% <0.00%> (+0.89%)	⬆️

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