org.apache.calcite.adapter.enumerable

Class EnumerableLimitSort

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.SingleRel

org.apache.calcite.rel.core.Sort

org.apache.calcite.adapter.enumerable.EnumerableLimitSort

All Implemented Interfaces:

Cloneable, EnumerableRel, RelOptNode, PhysicalNode, RelNode

public class EnumerableLimitSort
extends Sort
implements EnumerableRel

Implementation of Sort in enumerable calling convention. It optimizes sorts that have a limit and an optional offset.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.calcite.adapter.enumerable.EnumerableRel

EnumerableRel.Prefer, EnumerableRel.Result

Nested classes/interfaces inherited from interface org.apache.calcite.rel.RelNode

RelNode.Context

Field Summary

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

collation, fetch, offset

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

input

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

digest, id, rowType, traitSet

Constructor Summary

Constructors

Constructor and Description
EnumerableLimitSort(RelOptCluster cluster, RelTraitSet traitSet, RelNode input, RelCollation collation, RexNode offset, RexNode fetch) Creates an EnumerableLimitSort.

Method Summary

Modifier and Type	Method and Description
RelOptCost	computeSelfCost(RelOptPlanner planner, RelMetadataQuery mq) Returns the cost of this plan (not including children).
EnumerableLimitSort	copy(RelTraitSet traitSet, RelNode newInput, RelCollation newCollation, RexNode offset, RexNode fetch)
static EnumerableLimitSort	create(RelNode input, RelCollation collation, RexNode offset, RexNode fetch) Creates an EnumerableLimitSort.
EnumerableRel.Result	implement(EnumerableRelImplementor implementor, EnumerableRel.Prefer pref) Creates a plan for this expression according to a calling convention.

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

accept, copy, copy, explainTerms, getCollation, getSortExps, isEnforcer

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

childrenAccept, deriveRowType, estimateRowCount, getInput, getInputs, replaceInput

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

accept, collectVariablesSet, collectVariablesUsed, deepEquals, deepHashCode, equals, explain, getCluster, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getRelDigest, getRelTypeName, getRowType, getTable, getTraitSet, getVariablesSet, hashCode, isValid, metadata, onRegister, recomputeDigest, register, sole, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.calcite.adapter.enumerable.EnumerableRel

deriveTraits, getDeriveMode, passThroughTraits

Methods inherited from interface org.apache.calcite.rel.PhysicalNode

derive, derive, passThrough

Methods inherited from interface org.apache.calcite.rel.RelNode

accept, accept, childrenAccept, collectVariablesSet, collectVariablesUsed, copy, deepEquals, deepHashCode, estimateRowCount, explain, explain, getConvention, getCorrelVariable, getDigest, getExpectedInputRowType, getInput, getInputs, getRelDigest, getRelTypeName, getRowType, getTable, getVariablesSet, isEnforcer, isValid, metadata, onRegister, recomputeDigest, register, replaceInput

Methods inherited from interface org.apache.calcite.plan.RelOptNode

getCluster, getDescription, getId, getTraitSet

Constructor Detail

EnumerableLimitSort

public EnumerableLimitSort(RelOptCluster cluster,
                           RelTraitSet traitSet,
                           RelNode input,
                           RelCollation collation,
                           RexNode offset,
                           RexNode fetch)

Creates an EnumerableLimitSort.

Use create(org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelCollation, org.apache.calcite.rex.RexNode, org.apache.calcite.rex.RexNode) unless you know what you're doing.

Method Detail

create

public static EnumerableLimitSort create(RelNode input,
                                         RelCollation collation,
                                         RexNode offset,
                                         RexNode fetch)

Creates an EnumerableLimitSort.

copy

public EnumerableLimitSort copy(RelTraitSet traitSet,
                                RelNode newInput,
                                RelCollation newCollation,
                                RexNode offset,
                                RexNode fetch)

Specified by:

copy in class Sort

implement

public EnumerableRel.Result implement(EnumerableRelImplementor implementor,
                                      EnumerableRel.Prefer pref)

Description copied from interface: EnumerableRel

Creates a plan for this expression according to a calling convention.

Specified by:

implement in interface EnumerableRel

Parameters:

implementor - Implementor

pref - Preferred representation for rows in result expression

Returns:

Plan for this expression according to a calling convention

computeSelfCost

public RelOptCost computeSelfCost(RelOptPlanner planner,
                                  RelMetadataQuery mq)

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 Sort

Parameters:

planner - Planner for cost calculation

mq - Metadata query

Returns:

Cost of this plan (not including children)