[jira] [Created] (CALCITE-465) Remove OneRow and Empty relational expressions; Values will suffice

["Julian Hyde (JIRA)" <ji...@apache.org>]

Julian Hyde created CALCITE-465:
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             Summary: 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


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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