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https://issues.apache.org/jira/browse/CALCITE-4513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stamatis Zampetakis resolved CALCITE-4513.
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Fix Version/s: 1.38.0
Resolution: Fixed
Thanks for checking [~thomas.rebele] ! If this is fixed then we can mark this
ticket as resolved.
> RelBuilder.aggregate destroys input traits when pruning unused fields of
> project
> --------------------------------------------------------------------------------
>
> Key: CALCITE-4513
> URL: https://issues.apache.org/jira/browse/CALCITE-4513
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.23.0
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Major
> Fix For: 1.38.0
>
>
> RelBuilder attempts to prune unused fields when the underlying input is a
> project and the respective configuration
> ({{RelBuilder.Config#pruneInputOfAggregate}}) is enabled (CALCITE-3763). As a
> result of this optimization a new project operator is introduced in the plan.
> The new operator is created via {{Project#copy}} method but instead of
> retaining or adapting the previous traitset a new one is created
> (https://github.com/apache/calcite/blob/94502f51e6a12cd53cec88b39d21b4fec6070428/core/src/main/java/org/apache/calcite/tools/RelBuilder.java#L1922).
> {code:java}
> r = project.copy(cluster.traitSet(), project.getInput(), newProjects,
> builder.build());
> {code}
> The main problem with that is that a {{HiveProject}} operator which used to
> be in {{HiveConvention}} will be transformed to a {{HiveProject}} operator in
> {{Convention.None}}. Obviously other traits (apart from {{Convention}})
> potentially present in the operator are also lost after the transformation.
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