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https://issues.apache.org/jira/browse/KYLIN-2515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16131664#comment-16131664
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nichunen commented on KYLIN-2515:
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I have upload docs for the usage of query pushdown.
> Route unsupported query back to query its source directly
> ---------------------------------------------------------
>
> Key: KYLIN-2515
> URL: https://issues.apache.org/jira/browse/KYLIN-2515
> Project: Kylin
> Issue Type: New Feature
> Reporter: liyang
> Assignee: nichunen
> Fix For: v2.2.0
>
> Attachments: push_down_1.png, push_down_2.png, push_down_doc.patch,
> query_pushdown.cn.md, query_pushdown.md
>
>
> When Kylin cannot support a query due to lack of prepared mode and cube, the
> query can be routed back to executing on its original source. It may
> integrate with Hive, or SparkSQL, or Drill, or anything if so desired.
> There must be an interface defined first, to allow plug-in of any ad-hoc
> query engine.
> This is a carry-on from KYLIN-742
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