[System Tests] Change Spark tests to use a single window #1872
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…query in most cases)
Hedingber
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When running Spark aggregations with multiple windows on Spark version < 3.1, the code fails. This is since the code uses
unionByNamewith theallowMissingColumns=Trueparameter which was added in Spark 3.1. This PR changes the test to use a single window, which doesn't callunionByName, since some system-tests were running on old systems with old Spark version, and the tests failed.