| PApply |
Represents a constraint application on a single parent SubPlan.
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| PEnumerate |
Represents a base relation defined by the instance set of an enumerable PConstraint; there are no parent SubPlans.
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| PJoin |
Represents a natural join of two parent SubPlans.
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| POperation |
Abstract superclass for representing a high-level query evaluation operation.
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| PProject |
Represents a projection of a single parent SubPlan onto a limited set of variables.
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| PStart |
No constraints, and no parent SubPlan, just a (possibly empty) set of a priori known (input) variables.
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