[GitHub] [incubator-doris] yangzhg opened a new issue #3373: disable some syntax of subquey in case when clause

[GitBox <gi...@apache.org>]

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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