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https://issues.apache.org/jira/browse/IGNITE-19992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17755510#comment-17755510
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Maksim Zhuravkov commented on IGNITE-19992:
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[~korlov] [~xtern] Could you please review my patch?
> Sql. Rework execution of 2-phase set operators
> ----------------------------------------------
>
> Key: IGNITE-19992
> URL: https://issues.apache.org/jira/browse/IGNITE-19992
> Project: Ignite
> Issue Type: Improvement
> Components: sql
> Reporter: Konstantin Orlov
> Assignee: Maksim Zhuravkov
> Priority: Major
> Labels: ignite-3
> Time Spent: 20m
> Remaining Estimate: 0h
>
> As of now, both {{IntersectNode}} and {{MinusNode}} use complex structures as
> result of MAP phase (see
> {{org.apache.ignite.internal.sql.engine.exec.rel.AbstractSetOpNode.Grouping#getOnMapper}};
> it emits rows cardinality of 2, where first column is entire group key, and
> second column is an array of counters). This prevents us from migrating sql
> runtime to BinaryTuple-based rows, because currently BinaryTuple does not
> support nested structures.
> Let's rework those node to inline group key and counters into plain row.
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