org.apache.calcite.rel.logical

Class LogicalCalc

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.SingleRel

org.apache.calcite.rel.core.Calc

org.apache.calcite.rel.logical.LogicalCalc

All Implemented Interfaces:

Cloneable, RelOptNode, RelNode

public final class LogicalCalc
extends Calc

A relational expression which computes project expressions and also filters.

This relational expression combines the functionality of LogicalProject and LogicalFilter. It should be created in the later stages of optimization, by merging consecutive LogicalProject and LogicalFilter nodes together.

The following rules relate to LogicalCalc:

• FilterToCalcRule creates this from a LogicalFilter
• ProjectToCalcRule creates this from a LogicalFilter
• FilterCalcMergeRule merges this with a LogicalFilter
• ProjectCalcMergeRule merges this with a LogicalProject
• CalcMergeRule merges two LogicalCalcs

Field Summary

Fields inherited from class org.apache.calcite.rel.core.Calc

program

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

digest, id, rowType, traitSet

Constructor Summary

Constructors

Constructor and Description
LogicalCalc(RelOptCluster cluster, RelTraitSet traitSet, RelNode child, RexProgram program) Creates a LogicalCalc.
LogicalCalc(RelOptCluster cluster, RelTraitSet traitSet, RelNode child, RexProgram program, List<RelCollation> collationList) Deprecated.

Method Summary

Methods

Modifier and Type	Method and Description
void	collectVariablesUsed(Set<String> variableSet) Collects variables known to be used by this expression or its descendants.
LogicalCalc	copy(RelTraitSet traitSet, RelNode child, RexProgram program) Creates a copy of this Calc.
static LogicalCalc	create(RelNode input, RexProgram program)

Methods inherited from class org.apache.calcite.rel.core.Calc

accept, computeSelfCost, copy, copy, explainTerms, getProgram, getRows, isValid

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, 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

Constructor Detail

LogicalCalc

public LogicalCalc(RelOptCluster cluster,
           RelTraitSet traitSet,
           RelNode child,
           RexProgram program)

Creates a LogicalCalc.

LogicalCalc

@Deprecated
public LogicalCalc(RelOptCluster cluster,
                      RelTraitSet traitSet,
                      RelNode child,
                      RexProgram program,
                      List<RelCollation> collationList)

Deprecated.

Method Detail

create

public static LogicalCalc create(RelNode input,
                 RexProgram program)

copy

public LogicalCalc copy(RelTraitSet traitSet,
               RelNode child,
               RexProgram program)

Description copied from class: Calc

Creates a copy of this Calc.

Specified by:

copy in class 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:

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

collectVariablesUsed

public void collectVariablesUsed(Set<String> variableSet)

Description copied from interface: RelNode

Collects variables known to be used by this expression or its descendants. By default, no such information is available and must be derived by analyzing sub-expressions, but some optimizer implementations may insert special expressions which remember such information.

Specified by:

collectVariablesUsed in interface RelNode

Overrides:

collectVariablesUsed in class AbstractRelNode

Parameters:

variableSet - receives variables used