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https://issues.apache.org/jira/browse/TAJO-34?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyunsik Choi updated TAJO-34:
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Description:
h3. Background
The current Tajo does not support outer join. The parser part for outer join
was already implemented.
h3. Proposal
In this issue, we should improve LogicalPlanner/LogicalOptimizer to deal with
outer joins. Then, we should adopt outer join to existing physical join
operators like HashJoinExec and MergeJoinExec.
was:The current Tajo does not support outer join. In this issue, we will
investigate prerequisites for outer join and will create subtasks for them.
Finally, we will adopt outer join to existing physical join operators like
HashJoinExec and MergeJoinExec.
> Outer Join
> ----------
>
> Key: TAJO-34
> URL: https://issues.apache.org/jira/browse/TAJO-34
> Project: Tajo
> Issue Type: New Feature
> Reporter: Hyunsik Choi
> Labels: gsoc2013, join, mentor
>
> h3. Background
> The current Tajo does not support outer join. The parser part for outer join
> was already implemented.
> h3. Proposal
> In this issue, we should improve LogicalPlanner/LogicalOptimizer to deal with
> outer joins. Then, we should adopt outer join to existing physical join
> operators like HashJoinExec and MergeJoinExec.
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