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https://issues.apache.org/jira/browse/KYLIN-5781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17834930#comment-17834930
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pengfei.zhan commented on KYLIN-5781:
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h1. Description
When traversing the RelNode tree, subsequent traversal is used, and the stack
is used to record some child nodes. The design is reasonable.
!KYLIN_5781.png!
For the RelNode tree shown above, the traversal process is:
Process a first and put it on the stack, then b and put it on the stack, then c
and put it on the stack;
Process union 2, pop two nodes from the stack, namely c, b
The order of c, b does not match the original order.
> Adjust the query result order of sql with union
> -----------------------------------------------
>
> Key: KYLIN-5781
> URL: https://issues.apache.org/jira/browse/KYLIN-5781
> Project: Kylin
> Issue Type: Improvement
> Components: Query Engine
> Affects Versions: 5.0-beta
> Reporter: pengfei.zhan
> Assignee: pengfei.zhan
> Priority: Major
> Fix For: 5.0-beta
>
> Attachments: KYLIN_5781.png
>
>
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