borasy commented on issue #10221:
URL: https://github.com/apache/druid/issues/10221#issuecomment-785703658
Hi @gianm,
Is there any plan to support Union in a subquery and then GroupBy similar to
below query?
```
SELECT type, sum(cnt)
FROM (
SELECT
type,
COUNT(*) AS cnt
FROM
tbl_a
GROUP BY type
UNION ALL
SELECT
type,
COUNT(*) AS cnt
FROM
tbl_b
GROUP BY type
)
GROUP BY type
```
Thanks,
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