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https://issues.apache.org/jira/browse/SPARK-12820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15097614#comment-15097614
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Apache Spark commented on SPARK-12820:
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User 'zhichao-li' has created a pull request for this issue:
https://github.com/apache/spark/pull/10753
> Resolve column with full qualified names: db.table.column
> ---------------------------------------------------------
>
> Key: SPARK-12820
> URL: https://issues.apache.org/jira/browse/SPARK-12820
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: zhichao-li
> Priority: Minor
>
> Currently spark only support to specify col name like: `table.col`, or `col`
> in projection, but it's very common that user use `db.table.col` especially
> when join table across database.
> Hive doesn't support this for now but it has been used in lot of other
> traditional db like mysql.
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