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https://issues.apache.org/jira/browse/CALCITE-6199?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-6199:
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Labels: pull-request-available (was: )
> Trim unused fields for SNAPSHOT and SAMPLE if table has VIRTUAL column
> -----------------------------------------------------------------------
>
> Key: CALCITE-6199
> URL: https://issues.apache.org/jira/browse/CALCITE-6199
> Project: Calcite
> Issue Type: Improvement
> Reporter: Jiajun Xie
> Assignee: Jiajun Xie
> Priority: Major
> Labels: pull-request-available
>
> RelFieldTrimmer not support SNAPSHOT( So do Sample)
> * Here is a SQL example
> {code:java}
> select D, E from VIRTUALCOLUMNS.VC_T1
> for system_time as of TIMESTAMP '2011-01-02 00:00:00' {code}
> * Before Trimming
> {code:java}
> LogicalProject(D=[$3], E=[$4])
> LogicalSnapshot(period=[2011-01-02 00:00:00])
> LogicalProject(A=[$0], B=[$1], C=[$2], D=[$3], $f4=[+($0, 1)])
> LogicalTableScan(table=[[CATALOG, VIRTUALCOLUMNS, VC_T1]]){code}
> * After Trimming
> {code:java}
> LogicalSnapshot(period=[2011-01-02 00:00:00])
> LogicalProject(D=[$3], $f4=[+($0, 1)])
> LogicalTableScan(table=[[CATALOG, VIRTUALCOLUMNS, VC_T1]]){code}
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