Details
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Type:
Bug
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Status: Closed
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: None
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Fix Version/s: 1.0.0-incubating
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Component/s: None
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Labels:None
Description
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).