72e4dd01b9
Previously, subqueries would only be able to select tag fields within a
subquery if the subquery used a selector. But, it didn't filter out
aggregates like `mean()` so it would panic instead.
Now it is possible to select the tag directly instead of rewriting the
query in an invalid way.
Some queries in this form will still not work though. For example, the
following still does not function (but also doesn't panic):
SELECT count(host) FROM (SELECT mean, host FROM (SELECT mean(value) FROM cpu GROUP BY host))
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| .. | ||
| influx | ||
| influx_inspect | ||
| influx_stress | ||
| influx_tsm | ||
| influxd | ||
| parse.go | ||