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https://issues.apache.org/jira/browse/IGNITE-14635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yury Gerzhedovich updated IGNITE-14635:
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Labels: calcite2-required calcite3-required (was: )
> Calcite engine. EXCEPT operator using anti-join
> -----------------------------------------------
>
> Key: IGNITE-14635
> URL: https://issues.apache.org/jira/browse/IGNITE-14635
> Project: Ignite
> Issue Type: Improvement
> Reporter: Aleksey Plekhanov
> Priority: Minor
> Labels: calcite2-required, calcite3-required
>
> Currently, EXCEPT operator implemented as hash aggregation of underlying
> inputs, but in some cases ([all=false], inputs are colocated and have
> required collations) perhaps anti-join will be more effective (but
> benchmarking is needed) and produce streamed output.
> For example, query like {{SELECT f1 FROM t1 EXCEPT SELECT f1 FROM t2}} could
> be rewritten to {{SELECT DISTINCT f1 FROM t1 ANTI JOIN t2 USING (f1)}}.
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