Fix/#527 SET variables not available to subqueries

[joocer]

No description provided.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #530 (513ce94) into main (3dbf9fe) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #530   +/-   ##
=======================================
  Coverage   94.67%   94.68%           
=======================================
  Files         127      127           
  Lines        5037     5038    +1     
=======================================
+ Hits         4769     4770    +1     
  Misses        268      268           

Impacted Files	Coverage Δ
opteryx/utils/display.py	100.00% <ø> (ø)
tests/sql_battery/test_battery.py	100.00% <ø> (ø)
opteryx/managers/query/planner/planner.py	96.97% <100.00%> (+<0.01%)	⬆️
opteryx/operators/base_plan_node.py	92.85% <100.00%> (ø)
opteryx/version.py	100.00% <100.00%> (ø)

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