[jira] [Resolved] (SPARK-33871) Cannot access to column after left semi join and left join

["L. C. Hsieh (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-33871?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

L. C. Hsieh resolved SPARK-33871.
---------------------------------
    Resolution: Not A Problem

> 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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