viirya commented on pull request #31966:
URL: https://github.com/apache/spark/pull/31966#issuecomment-813241718
> This behaivour (the col name that is internally auto-generated is visible
to a user) is expected one?
>
> ```
> scala> sql("select __auto_generated_subquery_name.col.a from (select
explode(items) from t)").show()
> +---+
> | a|
> +---+
> | 1|
> | 2|
> +---+
> ```
I can see we use it in test:
https://github.com/apache/spark/blob/0494dc90af48ce7da0625485a4dc6917a244d580/sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala#L2788
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