Package org.apache.calcite.rel

Defines relational expressions.

Related packages and classes

• Package org.apache.calcite.sql is an object model for SQL expressions
• Package org.apache.calcite.rex is an object model for relational row expressions
• Package org.apache.calcite.plan provides an optimizer interface.

Interface Summary

Interface	Description
RelCollation	Description of the physical ordering of a relational expression.
RelDistribution	Description of the physical distribution of a relational expression.
RelInput	Context from which a relational expression can initialize itself, reading from a serialized form of the relational expression.
RelNode	A RelNode is a relational expression.
RelNode.Context	Context of a relational expression, for purposes of checking validity.
RelReferentialConstraint	Interface for a referential constraint, i.e., Foreign-Key - Unique-Key relationship, between two tables.
RelShuttle	Visitor that has methods for the common logical relational expressions.
RelWriter	Callback for an expression to dump itself to.

Class Summary

Class	Description
AbstractRelNode	Base class for every relational expression (RelNode).
BiRel	Abstract base class for relational expressions with a two inputs.
RelCollationImpl	Simple implementation of RelCollation.
RelCollations	Utilities concerning RelCollation and RelFieldCollation.
RelCollationTraitDef	Definition of the ordering trait.
RelDistributions	Utilities concerning RelDistribution.
RelDistributions.RelDistributionImpl	Implementation of RelDistribution.
RelDistributionTraitDef	Definition of the distribution trait.
RelFieldCollation	Definition of the ordering of one field of a RelNode whose output is to be sorted.
RelHomogeneousShuttle	Visits all the relations in a homogeneous way: always redirects calls to accept(RelNode).
RelNodes	Utilities concerning relational expressions.
RelNodes.RelNodeComparator	Arbitrary stable comparator for RelNodes.
RelReferentialConstraintImpl	RelOptReferentialConstraint base implementation.
RelRoot	Root of a tree of RelNode.
RelShuttleImpl	Basic implementation of RelShuttle that calls RelNode.accept(RelShuttle) on each child, and RelNode.copy(org.apache.calcite.plan.RelTraitSet, java.util.List) if any children change.
RelVisitor	A RelVisitor is a Visitor role in the visitor pattern and visits RelNode objects as the role of Element.
SingleRel	Abstract base class for relational expressions with a single input.

Enum Summary

Enum	Description
RelDistribution.Type	Type of distribution.
RelFieldCollation.Direction	Direction that a field is ordered in.
RelFieldCollation.NullDirection	Ordering of nulls.

Exception Summary

Exception	Description
InvalidRelException	Exception that indicates that a relational expression would be invalid with given parameters.