Package org.apache.calcite.rel

Interface RelCollation

All Superinterfaces:

Comparable<RelMultipleTrait>, RelMultipleTrait, RelTrait

All Known Implementing Classes:

RelCollationImpl

public interface RelCollation
extends RelMultipleTrait

Description of the physical ordering of a relational expression.

An ordering consists of a list of one or more column ordinals and the direction of the ordering.

Method Summary

Modifier and Type	Method	Description
List<RelFieldCollation>	getFieldCollations()	Returns the ordinals and directions of the columns in this ordering.
default ImmutableIntList	getKeys()	Returns the ordinals of the key columns.

Methods inherited from interface java.lang.Comparable

compareTo

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

isTop

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

apply, equals, getTraitDef, hashCode, isDefault, register, satisfies, toString

Method Details

getFieldCollations

List<RelFieldCollation> getFieldCollations()

Returns the ordinals and directions of the columns in this ordering.

getKeys

default ImmutableIntList getKeys()

Returns the ordinals of the key columns.