[
https://issues.apache.org/jira/browse/IMPALA-14423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Steve Carlin resolved IMPALA-14423.
-----------------------------------
Resolution: Fixed
> Calcite Planner: Rule needed to make Union over multiple Values nodes more
> efficient
> ------------------------------------------------------------------------------------
>
> Key: IMPALA-14423
> URL: https://issues.apache.org/jira/browse/IMPALA-14423
> Project: IMPALA
> Issue Type: Sub-task
> Reporter: Steve Carlin
> Priority: Major
>
> With v1.40, when we have the query
> select 1 union all select 5000;
> ...Calcite creates the following node structure:
> LogicalUnion
> LogicalProject
> LogicalValues
> LogicalProject
> LogicalValues
> The "1" and the "5000" are places in separate LogicalValues. The resulting
> Impala plan is inefficient because it creates an Impala plan that looks like
> this:
> Union
> Union (Value 1)
> Union (Value 5000)
> ...when it could be all placed within a single Union node with 2 tuples.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
