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https://issues.apache.org/jira/browse/CALCITE-4036?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vova Vysotskyi updated CALCITE-4036:
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Description: The current implementation of {{SemiJoinRule}} can be applied
for rel nodes where the right input of join is aggregate, but it theoretically
can be applied for the case when there is no aggregate, but right joint input
returns column which has only unique values. Column uniqueness may be checked
using {{BuiltInMetadata.ColumnUniqueness}} statistics. (was: The current
implementation of {{SemiJoinRule}} can be applied for rel nodes where the right
input of join is aggregate, but it theoretically can be applied for the case
when there is no aggregate, but right joint input returns single row which has
only unique values. Column uniqueness may be checked using
{{BuiltInMetadata.ColumnUniqueness}} statistics.)
> Allow applying SemiJoinRule to join without aggregate below
> -----------------------------------------------------------
>
> Key: CALCITE-4036
> URL: https://issues.apache.org/jira/browse/CALCITE-4036
> Project: Calcite
> Issue Type: Task
> Reporter: Vova Vysotskyi
> Assignee: Vova Vysotskyi
> Priority: Major
>
> The current implementation of {{SemiJoinRule}} can be applied for rel nodes
> where the right input of join is aggregate, but it theoretically can be
> applied for the case when there is no aggregate, but right joint input
> returns column which has only unique values. Column uniqueness may be checked
> using {{BuiltInMetadata.ColumnUniqueness}} statistics.
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