org.apache.calcite.rel.metadata

Class RelMdRowCount

java.lang.Object

org.apache.calcite.rel.metadata.RelMdRowCount

public class RelMdRowCount
extends Object

RelMdRowCount supplies a default implementation of RelMetadataQuery.getRowCount(org.apache.calcite.rel.RelNode) for the standard logical algebra.

Field Summary

Fields

Modifier and Type	Field and Description
static RelMetadataProvider	SOURCE

Constructor Summary

Constructors

Constructor and Description
RelMdRowCount()

Method Summary

Methods

Modifier and Type	Method and Description
Double	getRowCount(Aggregate rel)
Double	getRowCount(Filter rel)
Double	getRowCount(Project rel)
Double	getRowCount(RelNode rel)
Double	getRowCount(SemiJoin rel)
Double	getRowCount(Sort rel)
Double	getRowCount(Union rel)

Methods inherited from class java.lang.Object

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

Field Detail

SOURCE

public static final RelMetadataProvider SOURCE

Constructor Detail

RelMdRowCount

public RelMdRowCount()

Method Detail

getRowCount

public Double getRowCount(Union rel)

getRowCount

public Double getRowCount(Filter rel)

getRowCount

public Double getRowCount(Project rel)

getRowCount

public Double getRowCount(Sort rel)

getRowCount

public Double getRowCount(SemiJoin rel)

getRowCount

public Double getRowCount(Aggregate rel)

getRowCount

public Double getRowCount(RelNode rel)