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https://issues.apache.org/jira/browse/CALCITE-3713?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiening Dai reopened CALCITE-3713:
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The fix incurs performance overhead when using mapDigestToVertex,
mapDigestToRel, since now the hash code of List<RelDataType> has to be
recomputed every time.
See more discussion at https://github.com/apache/calcite/pull/1740
> Remove column names from Project#digest
> ---------------------------------------
>
> Key: CALCITE-3713
> URL: https://issues.apache.org/jira/browse/CALCITE-3713
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.21.0
> Reporter: Vladimir Sitnikov
> Assignee: Vladimir Sitnikov
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.22.0
>
> Time Spent: 4h
> Remaining Estimate: 0h
>
> Projects that differ with column names only are equivalent, so the planning
> space can be reduced if field names do not participate in relation matching.
> For instance, {{Project(input=rel#1,empid=$0)}} and
> {{Project(input=rel#1,deptno=$0)}} are equivalent
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