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

Methods

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

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

isTop

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

equals, getTraitDef, hashCode, register, satisfies, toString

Methods inherited from interface java.lang.Comparable

compareTo

Method Detail

getFieldCollations

List<RelFieldCollation> getFieldCollations()

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