Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/10762#discussion_r49827571
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala
---
@@ -144,6 +147,35 @@ case class Join(
}
}
+ def outerProjectList: Seq[NamedExpression] = {
--- End diff --
For select * from a natural join, we need to use a Project to get rid of
redundant columns.
In mysql, select * from natural join would only contain one row if both
size have the row of the same name. but user do can use something like `t1.a`
or `t2.a` to explicitly reference the column here. Do you think we should
implement it exactly the same? I'm afraid it would be a too complicated change,
but I can do that if necessary.
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