org.apache.drill.exec.planner.common

Interface OrderedRel

All Superinterfaces:

Cloneable, DrillRelNode, org.apache.calcite.rel.RelNode, org.apache.calcite.plan.RelOptNode

All Known Implementing Classes:

DrillSortRel, DrillSortRelBase, PluginSortRel, SortPrel, TopNPrel

public interface OrderedRel
extends DrillRelNode

Class implementing OrderedPrel interface guarantees to provide ordered output on certain columns. TopNPrel and SortPrel base classes which implement this interface.

Nested Class Summary

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

org.apache.calcite.rel.RelNode.Context

Method Summary

Modifier and Type	Method and Description
boolean	canBeDropped() A method to return if this relational node can be dropped during optimization process.
org.apache.calcite.rel.RelCollation	getCollation() A method to return ordering columns of the result.
org.apache.calcite.rex.RexNode	getFetch() Fetch value represented in RexNode.
org.apache.calcite.rex.RexNode	getOffset() Offset value represented in RexNode.

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

accept, accept, childrenAccept, collectVariablesSet, collectVariablesUsed, computeSelfCost, computeSelfCost, copy, estimateRowCount, explain, getChildExps, getCollationList, getConvention, getCorrelVariable, getExpectedInputRowType, getInput, getInputs, getQuery, getRelTypeName, getRows, getRowType, getTable, getVariablesSet, getVariablesStopped, isDistinct, isKey, isValid, isValid, metadata, onRegister, recomputeDigest, register, replaceInput

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

getCluster, getDescription, getDigest, getId, getTraitSet

Method Detail

getCollation

org.apache.calcite.rel.RelCollation getCollation()

A method to return ordering columns of the result.

Returns:

Collation order of the output.

getOffset

org.apache.calcite.rex.RexNode getOffset()

Offset value represented in RexNode.

Returns:

offset.

getFetch

org.apache.calcite.rex.RexNode getFetch()

Fetch value represented in RexNode.

Returns:

fetch

canBeDropped

boolean canBeDropped()

A method to return if this relational node can be dropped during optimization process.

Returns:

true if this node can be dropped, false otherwise.