karenfeng opened a new pull request, #36763: URL: https://github.com/apache/spark/pull/36763
### What changes were proposed in this pull request? Follows up from https://github.com/apache/spark/pull/31666. This PR introduced a bug where the qualified star expansion of a subquery alias containing a NATURAL/USING output duplicated columns. ### Why are the changes needed? Duplicated, hidden columns should not be output from a star expansion. ### Does this PR introduce _any_ user-facing change? The query ``` val df1 = Seq((3, 8)).toDF("a", "b") val df2 = Seq((8, 7)).toDF("b", "d") val joinDF = df1.join(df2, "b") joinDF.alias("r").select("r.*") ``` Now outputs a single column `b`, instead of two (duplicate) columns for `b`. ### How was this patch tested? UTs -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
