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https://issues.apache.org/jira/browse/SPARK-23168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-23168.
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Resolution: Incomplete
> Hints for fact tables and unique columns
> ----------------------------------------
>
> Key: SPARK-23168
> URL: https://issues.apache.org/jira/browse/SPARK-23168
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.2.1
> Reporter: Takeshi Yamamuro
> Priority: Minor
> Labels: bulk-closed
>
> We already have fact table and unique column inferences in
> StarSchemaDetection for decision making queries. IMHO, in most cases, users
> could know which is a fact table and which columns are unique. So, fact table
> and unique column hint might help for these users.
> For example,
> {code:java}
> scala> factTable.hint("factTable").hint("uid").join(dimTable)
> {code}
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