Support standard UNION/INTERSECT syntax#248

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dinodork wants to merge 5 commits intohyrise:mainfrom

dinodork:query-expression

Commits on Sep 19, 2024

Added standard support for CXXFLAGS.
Martin Hansson
committed
Initial refactoring.
Martin Hansson
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All of these queries are valid standard SQL. Thanks to the previous
Martin Hansson
committed
The previous change actually destroyed the part of subquery
Martin Hansson
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Manual edit needed after running format.sh.
Martin Hansson
committed