org.apache.calcite.plan

Class RelOptQuery

java.lang.Object

org.apache.calcite.plan.RelOptQuery

public class RelOptQuery
extends Object

A RelOptQuery represents a set of relational expressions which derive from the same select statement.

Field Summary

Fields

Modifier and Type	Field and Description
static String	CORREL_PREFIX Prefix to the name of correlating variables.

Constructor Summary

Constructors

Constructor and Description
RelOptQuery(RelOptPlanner planner) Creates a query.

Method Summary

Methods

Modifier and Type	Method and Description
RelOptCluster	createCluster(RelDataTypeFactory typeFactory, RexBuilder rexBuilder) Creates a cluster.
String	createCorrel() Constructs a new name for a correlating variable.
static int	getCorrelOrdinal(String correlName) Converts a correlating variable name into an ordinal, unqiue within the query.
RelNode	lookupCorrel(String name) Returns the relational expression which populates a correlating variable.
void	mapCorrel(String name, RelNode rel) Maps a correlating variable to a RelNode.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

CORREL_PREFIX

public static final String CORREL_PREFIX

Prefix to the name of correlating variables.

See Also:

Constant Field Values

Constructor Detail

RelOptQuery

public RelOptQuery(RelOptPlanner planner)

Creates a query.

Parameters:

planner - Planner

Method Detail

getCorrelOrdinal

public static int getCorrelOrdinal(String correlName)

Converts a correlating variable name into an ordinal, unqiue within the query.

Parameters:

correlName - Name of correlating variable

Returns:

Correlating variable ordinal

createCluster

public RelOptCluster createCluster(RelDataTypeFactory typeFactory,
                          RexBuilder rexBuilder)

Creates a cluster.

Parameters:

typeFactory - Type factory

rexBuilder - Expression builder

Returns:

New cluster

createCorrel

public String createCorrel()

Constructs a new name for a correlating variable. It is unique within the whole query.

lookupCorrel

public RelNode lookupCorrel(String name)

Returns the relational expression which populates a correlating variable.

mapCorrel

public void mapCorrel(String name,
             RelNode rel)

Maps a correlating variable to a RelNode.