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https://issues.apache.org/jira/browse/IMPALA-7112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17107572#comment-17107572
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Tim Armstrong commented on IMPALA-7112:
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We ended up implementing IMPALA-110 without DAG execution. It would still be a
useful primitive to materialize and reuse results of a shared plan tree for
features like IMPALA-7114
> Change from tree-execution to a dag-execution model
> ---------------------------------------------------
>
> Key: IMPALA-7112
> URL: https://issues.apache.org/jira/browse/IMPALA-7112
> Project: IMPALA
> Issue Type: Improvement
> Affects Versions: Impala 3.0, Impala 2.12.0
> Reporter: Ruslan Dautkhanov
> Priority: Major
> Labels: DAGScheduler, scheduler
>
> Quoting [~alex.behm] from IMPALA-110 comment :
> {quote}
> * The feature requires fundamental architectural changes from a
> tree-execution to a dag-execution model.
> {quote}
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