support support more syntax in case-when clause with subquey. suport query like ` case when k1 > subquery1 and k2 < subquey2 then ... else ... ` or `case when subquey in null then ...`
support support more syntax in case-when clause with subquey. suport query like ` case when k1 > subquery1 and k2 < subquey2 then ... else ... ` or `case when subquey in null then ...`