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Posted to issues@calcite.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/03/31 22:44:00 UTC
[jira] [Updated] (CALCITE-1045) Decorrelate sub-queries in Project
and Join
[ https://issues.apache.org/jira/browse/CALCITE-1045?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated CALCITE-1045:
------------------------------------
Labels: pull-request-available sub-query (was: sub-query)
> Decorrelate sub-queries in Project and Join
> -------------------------------------------
>
> Key: CALCITE-1045
> URL: https://issues.apache.org/jira/browse/CALCITE-1045
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Priority: Major
> Labels: pull-request-available, sub-query
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In CALCITE-816 we created a representation of sub-query in the relational algebra, RexSubQuery, so that we could defer expanding and de-correlating sub-queries until after SqlNode tree has been converted to RelNode tree. But the RelDecorrelator can only reliably handle sub-queries that occur in a Filter (such as WHERE EXISTS or WHERE IN).
> This task would except RelDecorrelator to handle sub-queries in Project (which occur with scalar sub-queries in the SELECT clause) and sub-queries in Join (which occur with scalar sub-queries in the ON clause of a JOIN).
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