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https://issues.apache.org/jira/browse/SPARK-35309?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Derk Crezee resolved SPARK-35309.
---------------------------------
Resolution: Not A Bug
> array transform should respect alias in expression
> --------------------------------------------------
>
> Key: SPARK-35309
> URL: https://issues.apache.org/jira/browse/SPARK-35309
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Derk Crezee
> Priority: Major
>
> When an array is transformed using the transform function in combination with
> an alias, I get an unexpected column name.
> {code:scala}
> // code placeholder
> val data = Seq((Array(1, 2, 3)))
> val df = sc.parallelize(data).toDF("a")
> val dfRes = df.select(
> transform(
> $"a",
> (col: Column) => struct(col).alias("struct_alias")
> ).alias("a")
> )
> dfRes.printSchema
> // root
> // |-- a: array (nullable = true)
> // | |-- element: struct (containsNull = false)
> // | | |-- x: integer (nullable = false)
> {code}
> I expected the inner element to have the name 'struct_alias'.
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