yangzhg opened a new issue #3373:
URL: https://github.com/apache/incubator-doris/issues/3373
for now doris only support binary predict of subquery in case when clause
like
```
SELECT CASE
WHEN (
SELECT COUNT(*) / 2
FROM t
) > k4 THEN (
SELECT AVG(k4)
FROM t
)
ELSE (
SELECT SUM(k4)
FROM t
)
END AS kk4
FROM t;
```
not support `in` or `exists` in subquery like
```
select case when k1 in (select k1 from baseall) then "true" else k1 end a
from baseall;
select case k1 when exists (select 1) then "empty" else "p_test" end a from
bigtable;
```
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