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https://issues.apache.org/jira/browse/CALCITE-465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde closed CALCITE-465.
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Closing now that 1.0.0-incubating has been released.
> Remove OneRow and Empty relational expressions; Values will suffice
> -------------------------------------------------------------------
>
> Key: CALCITE-465
> URL: https://issues.apache.org/jira/browse/CALCITE-465
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Fix For: 1.0.0-incubating
>
>
> The OneRow and Empty relational expressions do not give any descriptive power
> over a Values relational expression with 1 tuple and 0 tuples, respectively.
> We should remove them (and their sub-classes).
> Now that RelOptRuleOperand can take a Predicate, it is easy to write rules
> that match a Values that has zero tuples.
> Benefits include efficiency (the planning process will creature fewer
> relational expressions) and rule re-use (rules applicable to Values are now
> automatically applicable to 1- and 0-row relational expressions).
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