fqaiser94 created SPARK-32521:
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Summary: WithFields Expression should not be foldable
Key: SPARK-32521
URL: https://issues.apache.org/jira/browse/SPARK-32521
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.1.0
Reporter: fqaiser94
The following query currently fails on master brach:
{code:scala}
sql("SELECT named_struct('a', 1, 'b', 2) a")
.select($"a".withField("c", lit(3)).as("a"))
.show(false)
// java.lang.UnsupportedOperationException: Cannot evaluate expression:
with_fields(named_struct(a, 1, b, 2), c, 3)
{code}
This happens because Catalyst optimizer tries to statically evaluate the
{{WithFields Expression}} (via the {{ConstantFolding}} rule), however it cannot
do so because {{WithFields Expression}} is {{Unevaluable}}.
The likely solution here is to change {{WithFields Expression}} so that it is
not {{foldable}} under any circumstance. This should solve the issue because
then Catalyst will no longer attempt to statically evaluate {{WithFields
Expression}} anymore.
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