org.apache.calcite.plan

Interface RelOptNode

All Known Subinterfaces:

BindableRel, Converter, EnumerableRel, InterpretableRel, JdbcRel, RelNode, RelStructuredTypeFlattener.SelfFlatteningRel

All Known Implementing Classes:

AbstractConverter, AbstractRelNode, Aggregate, Bindables.BindableAggregate, Bindables.BindableFilter, Bindables.BindableJoin, Bindables.BindableProject, Bindables.BindableSort, Bindables.BindableTableScan, Bindables.BindableUnion, Bindables.BindableValues, Bindables.BindableWindow, BiRel, Calc, Chi, Collect, ConverterImpl, Correlate, Delta, EnumerableAggregate, EnumerableBindable, EnumerableCalc, EnumerableCollect, EnumerableCorrelate, EnumerableFilter, EnumerableInterpretable, EnumerableInterpreter, EnumerableIntersect, EnumerableJoin, EnumerableLimit, EnumerableMergeJoin, EnumerableMinus, EnumerableProject, EnumerableSemiJoin, EnumerableSort, EnumerableTableFunctionScan, EnumerableTableModify, EnumerableTableScan, EnumerableThetaJoin, EnumerableUncollect, EnumerableUnion, EnumerableValues, EnumerableWindow, EquiJoin, EquiJoin, Exchange, Filter, HepRelVertex, InterpretableConverter, Intersect, JdbcRules.JdbcAggregate, JdbcRules.JdbcCalc, JdbcRules.JdbcFilter, JdbcRules.JdbcIntersect, JdbcRules.JdbcJoin, JdbcRules.JdbcMinus, JdbcRules.JdbcProject, JdbcRules.JdbcSort, JdbcRules.JdbcTableModify, JdbcRules.JdbcUnion, JdbcRules.JdbcValues, JdbcTableScan, JdbcToEnumerableConverter, Join, LogicalAggregate, LogicalCalc, LogicalChi, LogicalCorrelate, LogicalDelta, LogicalExchange, LogicalFilter, LogicalIntersect, LogicalJoin, LogicalMinus, LogicalProject, LogicalSort, LogicalTableFunctionScan, LogicalTableModify, LogicalTableScan, LogicalUnion, LogicalValues, LogicalWindow, Minus, MultiJoin, NoneConverter, Project, RelSubset, Sample, SemiJoin, SetOp, SingleRel, Sort, SortExchange, StarTable.StarTableScan, TableFunctionScan, TableModify, TableScan, Uncollect, Union, Values, Window

public interface RelOptNode

Node in a planner.

Method Summary

Methods

Modifier and Type	Method and Description
RelOptCluster	getCluster() Returns the cluster this relational expression belongs to.
String	getDescription() Returns a string which describes the relational expression and, unlike getDigest(), also includes the identity.
String	getDigest() Returns a string which concisely describes the definition of this relational expression.
int	getId() Returns the ID of this relational expression, unique among all relational expressions created since the server was started.
List<? extends RelOptNode>	getInputs() Returns an array of this relational expression's inputs.
RelDataType	getRowType()
RelTraitSet	getTraitSet() Retrieves this RelNode's traits.

Method Detail

getId

int getId()

Returns the ID of this relational expression, unique among all relational expressions created since the server was started.

Returns:

Unique ID

getDigest

String getDigest()

Returns a string which concisely describes the definition of this relational expression. Two relational expressions are equivalent if and only if their digests are the same.

The digest does not contain the relational expression's identity -- that would prevent similar relational expressions from ever comparing equal -- but does include the identity of children (on the assumption that children have already been normalized).

If you want a descriptive string which contains the identity, call Object.toString(), which always returns "rel#{id}:{digest}".

Returns:

Digest of this RelNode

getTraitSet

RelTraitSet getTraitSet()

Retrieves this RelNode's traits. Note that although the RelTraitSet returned is modifiable, it must not be modified during optimization. It is legal to modify the traits of a RelNode before or after optimization, although doing so could render a tree of RelNodes unimplementable. If a RelNode's traits need to be modified during optimization, clone the RelNode and change the clone's traits.

Returns:

this RelNode's trait set

getRowType

RelDataType getRowType()

getDescription

String getDescription()

Returns a string which describes the relational expression and, unlike getDigest(), also includes the identity. Typically returns "rel#{id}:{digest}".

Returns:

String which describes the relational expression and, unlike getDigest(), also includes the identity

getInputs

List<? extends RelOptNode> getInputs()

Returns an array of this relational expression's inputs. If there are no inputs, returns an empty list, not null.

Returns:

Array of this relational expression's inputs

getCluster

RelOptCluster getCluster()

Returns the cluster this relational expression belongs to.

Returns:

cluster