Wrap connect operations in subqueries #341
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Description
The way in which we were performing connect operations meant that following these operations, cardinality had been affected, which meant following operations could potentially have unexpected results. Resolved by wrapping connect operations in subqueries, which means cardinality is unaffected.
Also renamed test files which had '#' characters in the file name.
Issue
Resolves:
Checklist
The following requirements should have been met (depending on the changes in the branch):