test: add reproducer that shows group by behaviour #25827
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Related to #25751
This is a reproducer for what I think is a bug in the InfluxQL query planner/executor.
What this demonstrates is that when a regex is used in a
GROUP BYin an InfluxQL query to select on groups of multiple tags, the tags that do not match the regex are not included in the projected query result.However, if the same tags that would be matched by the regex are provided explicitly, the other columns are included in the projection.
See the test added in this PR.