org.apache.calcite.rel.core

Class Calc

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.SingleRel

org.apache.calcite.rel.core.Calc

All Implemented Interfaces:

Cloneable, RelOptNode, RelNode

Direct Known Subclasses:

EnumerableCalc, LogicalCalc

public abstract class Calc
extends SingleRel

Calc is an abstract base class for implementations of LogicalCalc.

Field Summary

Fields

Modifier and Type	Field and Description
protected RexProgram	program

Fields inherited from class org.apache.calcite.rel.AbstractRelNode

digest, id, rowType, traitSet

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Calc(RelOptCluster cluster, RelTraitSet traits, RelNode child, RexProgram program) Creates a Calc.
protected	Calc(RelOptCluster cluster, RelTraitSet traits, RelNode child, RexProgram program, List<RelCollation> collationList) Deprecated.

Method Summary

Methods

Modifier and Type	Method and Description
RelNode	accept(RexShuttle shuttle) Accepts a visit from a shuttle.
RelOptCost	computeSelfCost(RelOptPlanner planner) Returns the cost of this plan (not including children).
Calc	copy(RelTraitSet traitSet, List<RelNode> inputs) Creates a copy of this relational expression, perhaps changing traits and inputs.
abstract Calc	copy(RelTraitSet traitSet, RelNode child, RexProgram program) Creates a copy of this Calc.
Calc	copy(RelTraitSet traitSet, RelNode child, RexProgram program, List<RelCollation> collationList) Deprecated.
RelWriter	explainTerms(RelWriter pw) Describes the inputs and attributes of this relational expression.
RexProgram	getProgram()
double	getRows() Returns an estimate of the number of rows this relational expression will return.
boolean	isValid(boolean fail) Returns whether this relational expression is valid.

Methods inherited from class org.apache.calcite.rel.SingleRel

childrenAccept, deriveRowType, getInput, getInputs, replaceInput

Methods inherited from class org.apache.calcite.rel.AbstractRelNode

accept, collectVariablesSet, collectVariablesUsed, computeDigest, explain, getChildExps, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getQuery, getRelTypeName, getRowType, getTable, getTraitSet, getVariablesStopped, isDistinct, isKey, metadata, onRegister, recomputeDigest, register, sole, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

program

protected final RexProgram program

Constructor Detail

Calc

protected Calc(RelOptCluster cluster,
    RelTraitSet traits,
    RelNode child,
    RexProgram program)

Creates a Calc.

Parameters:

cluster - Cluster

traits - Traits

child - Input relation

program - Calc program

Calc

@Deprecated
protected Calc(RelOptCluster cluster,
               RelTraitSet traits,
               RelNode child,
               RexProgram program,
               List<RelCollation> collationList)

Deprecated.

Method Detail

copy

public final Calc copy(RelTraitSet traitSet,
        List<RelNode> inputs)

Description copied from interface: RelNode

Creates a copy of this relational expression, perhaps changing traits and inputs.

Sub-classes with other important attributes are encouraged to create variants of this method with more parameters.

Specified by:

copy in interface RelNode

Overrides:

copy in class AbstractRelNode

Parameters:

traitSet - Trait set

inputs - Inputs

Returns:

Copy of this relational expression, substituting traits and inputs

copy

public abstract Calc copy(RelTraitSet traitSet,
        RelNode child,
        RexProgram program)

Creates a copy of this Calc.

Parameters:

traitSet - Traits

child - Input relation

program - Calc program

Returns:

New Calc if any parameter differs from the value of this Calc, or just this if all the parameters are the same

See Also:

copy(org.apache.calcite.plan.RelTraitSet, java.util.List)

copy

@Deprecated
public Calc copy(RelTraitSet traitSet,
                   RelNode child,
                   RexProgram program,
                   List<RelCollation> collationList)

Deprecated.

isValid

public boolean isValid(boolean fail)

Description copied from interface: RelNode

Returns whether this relational expression is valid.

If assertions are enabled, this method is typically called with fail = true, as follows:

assert rel.isValid(true)

This signals that the method can throw an AssertionError if it is not valid.

Specified by:

isValid in interface RelNode

Overrides:

isValid in class AbstractRelNode

Parameters:

fail - Whether to fail if invalid

Returns:

Whether relational expression is valid

getProgram

public RexProgram getProgram()

getRows

public double getRows()

Description copied from interface: RelNode

Returns an estimate of the number of rows this relational expression will return.

NOTE jvs 29-Mar-2006: Don't call this method directly. Instead, use RelMetadataQuery.getRowCount(org.apache.calcite.rel.RelNode), which gives plugins a chance to override the rel's default ideas about row count.

Specified by:

getRows in interface RelNode

Overrides:

getRows in class SingleRel

Returns:

Estimate of the number of rows this relational expression will return

computeSelfCost

public RelOptCost computeSelfCost(RelOptPlanner planner)

Description copied from interface: RelNode

Returns the cost of this plan (not including children). The base implementation throws an error; derived classes should override.

NOTE jvs 29-Mar-2006: Don't call this method directly. Instead, use RelMetadataQuery.getNonCumulativeCost(org.apache.calcite.rel.RelNode), which gives plugins a chance to override the rel's default ideas about cost.

Specified by:

computeSelfCost in interface RelNode

Overrides:

computeSelfCost in class AbstractRelNode

Parameters:

planner - Planner for cost calculation

Returns:

Cost of this plan (not including children)

explainTerms

public RelWriter explainTerms(RelWriter pw)

Description copied from class: AbstractRelNode

Describes the inputs and attributes of this relational expression. Each node should call super.explainTerms, then call the RelWriterImpl.input(String, RelNode) and RelWriterImpl.item(String, Object) methods for each input and attribute.

Overrides:

explainTerms in class SingleRel

Parameters:

pw - Plan writer

Returns:

Plan writer for fluent-explain pattern

accept

public RelNode accept(RexShuttle shuttle)

Description copied from interface: RelNode

Accepts a visit from a shuttle. If the shuttle updates expression, then a copy of the relation should be created.

Specified by:

accept in interface RelNode

Overrides:

accept in class AbstractRelNode

Parameters:

shuttle - Shuttle

Returns:

A copy of this node incorporating changes made by the shuttle to this node's children