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f6f974cdeb
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