Stefan Kandic created SPARK-46539:
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Summary: SELECT * EXCEPT(all fields from a struct) results in an
assertion failure
Key: SPARK-46539
URL: https://issues.apache.org/jira/browse/SPARK-46539
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.0.0
Reporter: Stefan Kandic
Fix For: 4.0.0
This example
{code:sql}
-- Removing all fields results in an empty struct
> SELECT * EXCEPT(c1.a) FROM VALUES(named_struct('a', 1)) AS t(c1);
{code}
throws an AssertionError during serialization:
{code:java}
AssertionError: assertion failed: each serializer expression should contain at
least one `BoundReference`
{code}
instead of just return an empty struct
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