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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