Improve compressed DML expression pushdown

[svenklemm]

Try to constify query constraints when filtering batches to cover a wider range of expressions that are safe to evaluate when we do the batch filtering.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.73%. Comparing base (59f50f2) to head (19d05ec). Report is 148 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6895      +/-   ##
==========================================
+ Coverage   80.06%   80.73%   +0.66%     
==========================================
  Files         190      199       +9     
  Lines       37181    37209      +28     
  Branches     9450     9726     +276     
==========================================
+ Hits        29770    30041     +271     
- Misses       2997     3206     +209     
+ Partials     4414     3962     -452     

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