Planner improvements

[can-keklik]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 93.87755% with 3 lines in your changes missing coverage. Please review.

Project coverage is 81.96%. Comparing base (12c326d) to head (85973bd).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
lykiadb-server/src/plan/planner.rs	92.00%	2 Missing ⚠️
lykiadb-server/src/engine/interpreter.rs	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
+ Coverage   81.70%   81.96%   +0.25%     
==========================================
  Files          30       30              
  Lines        4953     4990      +37     
==========================================
+ Hits         4047     4090      +43     
+ Misses        906      900       -6     

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