fix: flow compare null values

[discord9]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

fix a bug in flow which fail to handle null array comparison:

• forget to handle null scalar case causing compare with null array and some non-null array

future works:

• need to check all logic in flow which could handle null array incorrectly

PR Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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[codecov]

Codecov Report

Attention: Patch coverage is 15.38462% with 33 lines in your changes missing coverage. Please review.

Project coverage is 83.76%. Comparing base (4051be4) to head (b05f192).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5234      +/-   ##
==========================================
- Coverage   84.08%   83.76%   -0.32%     
==========================================
  Files        1193     1195       +2     
  Lines      221268   222084     +816     
==========================================
- Hits       186047   186027      -20     
- Misses      35221    36057     +836     

[zhongzc]

most LGTM