Lauri Koobas created SPARK-34714:
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Summary: collect_list(struct()) fails when used with GROUP BY
Key: SPARK-34714
URL: https://issues.apache.org/jira/browse/SPARK-34714
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.1.1
Environment: Databricks Runtime 8.0
Reporter: Lauri Koobas
The following is failing in DBR8.0 / Spark 3.1.1, but works in earlier DBR and
Spark versions:
{quote}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
{quote}
Fails with the following error message:
{quote}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
{quote}
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.
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