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https://issues.apache.org/jira/browse/SPARK-8668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14606073#comment-14606073
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Reynold Xin commented on SPARK-8668:
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This is not about selectExpr, but adding a new "expr" function that takes in a
single string, and returns an expression.
Once we do that, we can have "expr" and "selectExpr" support taking in one
string, and returning multiple expressions (wrapped in a wrapper expression
that the analyzer can expand).
> expr function to convert SQL expression into a Column
> -----------------------------------------------------
>
> Key: SPARK-8668
> URL: https://issues.apache.org/jira/browse/SPARK-8668
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
>
> selectExpr uses the expression parser to parse a string expressions. would be
> great to create an "expr" function in functions.scala/functions.py that
> converts a string into an expression (or a list of expressions separated by
> comma).
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