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A GROUP BY combined with aggregation should produce a single row per group, except for empty groups. This is in contrast to an aggregation without GROUP BY, which produces a single row no matter what. The existing code only considered the case of no grouping and forced a row into the result, but this caused an unwanted row if grouping was used. Fix by refining the check to also consider GROUP BY. XFAIL tests are relaxed. Fixes #12477. Note, forward_service requires that aggregation produce exactly one row, but since it can't work with grouping, it isn't affected. Closes #14399
All tests in this directory and its subdirectories were translated from Apache Cassandra's unit tests - the test/unit/org/apache/cassandra/cql3 directory in the Apache Cassandra source code repository. The organization of this directory mirrors that of the Cassandra directory, with test files renamed from SomeThingTest.java to some_thing_test.py. Individual files were translated in their entirety, and each individual file includes a comment on which version of the file was translated (Cassandra's tests continue to evolve, so we may later want to catch up with the differences). Please avoid adding new tests, not translated from Cassandra, in this directory. Instead, place new tests written from scratch for Scylla, or improved tests, in the directory above.