Fixed issue with union not returning correct results

[brynrhodes]

No description provided.

[github-actions]

Formatting check succeeded!

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (v3@a776ff1). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
.../opencds/cqf/cql/engine/execution/Environment.java	25.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             v3    #1662   +/-   ##
=====================================
  Coverage      ?   65.24%           
  Complexity    ?     1977           
=====================================
  Files         ?      503           
  Lines         ?    29081           
  Branches      ?     5693           
=====================================
  Hits          ?    18973           
  Misses        ?     7782           
  Partials      ?     2326           

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[sonarqubecloud]

Quality Gate failed

Failed conditions
2 Security Hotspots
65.4% Coverage on New Code (required ≥ 80%)
E Reliability Rating on New Code (required ≥ A)

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