[jira] [Created] (SPARK-32521) WithFields Expression should not be foldable

["fqaiser94 (Jira)" <ji...@apache.org>]

fqaiser94 created SPARK-32521:
---------------------------------

             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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