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https://issues.apache.org/jira/browse/SPARK-11619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15018739#comment-15018739
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Yin Huai commented on SPARK-11619:
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[~cloud_fan] Seems we do not have a way to specify multiple aliases to the
value of a generator in {{selectExpr}}?
> cannot use UDTF in DataFrame.selectExpr
> ---------------------------------------
>
> Key: SPARK-11619
> URL: https://issues.apache.org/jira/browse/SPARK-11619
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Wenchen Fan
> Priority: Minor
>
> Currently if use UDTF like `explode`, `json_tuple` in `DataFrame.selectExpr`,
> it will be parsed into `UnresolvedFunction` first, and then alias it with
> `expr.prettyString`. However, UDTF may need MultiAlias so we will get error
> if we run:
> {code}
> val df = Seq((Map("1" -> 1), 1)).toDF("a", "b")
> df.selectExpr("explode(a)").show()
> {code}
> [info] org.apache.spark.sql.AnalysisException: Expect multiple names given
> for org.apache.spark.sql.catalyst.expressions.Explode,
> [info] but only single name ''explode(a)' specified;
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