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https://issues.apache.org/jira/browse/SPARK-33871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17255978#comment-17255978
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Hyukjin Kwon commented on SPARK-33871:
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+1 for [~viirya]'s advice here.
> Cannot access to column after left semi join and left join
> -----------------------------------------------------------
>
> Key: SPARK-33871
> URL: https://issues.apache.org/jira/browse/SPARK-33871
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Evgenii Samusenko
> Priority: Minor
>
> Cannot access to column after left semi join and left join
> {code}
> val col = "c1"
> val df = Seq((1, "a"),(2, "a"),(3, "a"),(4, "a")).toDF(col, "c2")
> val df2 = Seq(1).toDF(col)
> val semiJoin = df.join(df2, df(col) === df2(col), "left_semi")
> val left = df.join(semiJoin, df(col) === semiJoin(col), "left")
> left.show
> +---+---+----+----+
> | c1| c2| c1| c2|
> +---+---+----+----+
> | 1| a| 1| a|
> | 2| a|null|null|
> | 3| a|null|null|
> | 4| a|null|null|
> +---+---+----+----+
> left.select(semiJoin(col))
> +---+
> | c1|
> +---+
> | 1|
> | 2|
> | 3|
> | 4|
> +---+
> left.select(df(col))
> +---+
> | c1|
> +---+
> | 1|
> | 2|
> | 3|
> | 4|
> +---+
> {code}
>
>
>
>
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