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relational/tests_dir/select_join.query

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Subtle bug that occurred selecting after a join Outer joins add the placeholder '---' that is used as some sort of NULL value. However select operations on such relations would always fail, because relations are supposed to only contain values of class rstring, and the placeholder was added as a regular string. As a consequence, automatic casting would always fail, and the select would always raise an exception. Added a new test case with this specific case in mind.
2015-09-10 05:19:51 -05:00
σ id==3(people ⧓ skills)
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