[jira] [Resolved] (SPARK-7990) Add methods to facilitate equi-join on multiple join keys

["Reynold Xin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-7990?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reynold Xin resolved SPARK-7990.
--------------------------------
       Resolution: Fixed
    Fix Version/s: 1.5.0
         Assignee: Liang-Chi Hsieh

> Add methods to facilitate equi-join on multiple join keys
> ---------------------------------------------------------
>
>                 Key: SPARK-7990
>                 URL: https://issues.apache.org/jira/browse/SPARK-7990
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Reynold Xin
>            Assignee: Liang-Chi Hsieh
>             Fix For: 1.5.0
>
>
> We have a variant of the join function that facilitates equi-join on a single join key, but we don't have one to do it for multiple join keys.
> This is the existing Python API:
> {code}
> def join(self, other, joinExprs=None, joinType=None):
> {code}
> I think we should rename joinExprs to "on", and joinType to "how" to match Pandas. And then the "on" column should support either a string, a join condition, a list of string, or a list of join condition ("and" together).
> In order to support the Python API, we'd need to add a variant for Scala as well. I think we can add another join method that looks like
> {code}
> def join(other: DataFrame, on: Seq[String], joinType: String): DataFrame
> {code}
> and update the existing Scala one to call this one.



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