Major Description
The following is failing in DBR8.0 / Spark 3.1.1, but works in earlier DBR and Spark versions:
with step_1 as (
select 'E' as name, named_struct('subfield', 1) as field_1
)
select name, collect_list(struct(field_1.subfield))
from step_1
group by 1
Fails with the following error message:
AnalysisException: cannot resolve 'struct(step_1.`field_1`.`subfield`)' due to data type mismatch: Only foldable string expressions are allowed to appear at odd position, got: NamePlaceholder
If you modify the query in any of the following ways then it still works::
- if you remove the field "name" and the "group by 1" part of the query
- if you remove the "struct()" from within the collect_list()
- if you use "named_struct()" instead of "struct()" within the collect_list()
Similarly collect_set() is broken and possibly more related functions, but I haven't done thorough testing.