cloud-fan commented on PR #38586:
URL: https://github.com/apache/spark/pull/38586#issuecomment-1309885760
In the Scala DataFrame, `Column` is the entry API for users to build an
expression tree. For example, `df.select($"a".cast("int"))`, `$"a"` is a syntax
sugar to create a `Column` with underlying expression
`UnresolvedAttribute(Seq("a"))`.
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