org.apache.calcite.rel.metadata

Class RelMdSize

java.lang.Object

org.apache.calcite.rel.metadata.RelMdSize

public class RelMdSize
extends Object

Default implementations of the BuiltInMetadata.Size metadata provider for the standard logical algebra.

See Also:

RelMetadataQuery.getAverageRowSize(org.apache.calcite.rel.RelNode), RelMetadataQuery.getAverageColumnSizes(org.apache.calcite.rel.RelNode), RelMetadataQuery.getAverageColumnSizesNotNull(org.apache.calcite.rel.RelNode)

Field Summary

Fields

Modifier and Type	Field and Description
static int	BYTES_PER_CHARACTER Bytes per character (2).
static RelMetadataProvider	SOURCE Source for BuiltInMetadata.Size.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RelMdSize()

Method Summary

Methods

Modifier and Type	Method and Description
List<Double>	averageColumnSizes(Aggregate rel)
List<Double>	averageColumnSizes(Exchange rel)
List<Double>	averageColumnSizes(Filter rel)
List<Double>	averageColumnSizes(Intersect rel)
List<Double>	averageColumnSizes(Join rel)
List<Double>	averageColumnSizes(Minus rel)
List<Double>	averageColumnSizes(Project rel)
List<Double>	averageColumnSizes(RelNode rel) Catch-all implementation for BuiltInMetadata.Size.averageColumnSizes(), invoked using reflection.
List<Double>	averageColumnSizes(SemiJoin rel)
List<Double>	averageColumnSizes(Sort rel)
List<Double>	averageColumnSizes(TableScan rel)
List<Double>	averageColumnSizes(Union rel)
List<Double>	averageColumnSizes(Values rel)
protected Double	averageFieldValueSize(RelDataTypeField field) Estimates the average size (in bytes) of a value of a field, knowing nothing more than its type.
Double	averageRexSize(RexNode node, List<Double> inputColumnSizes)
Double	averageRowSize(RelNode rel) Catch-all implementation for BuiltInMetadata.Size.averageRowSize(), invoked using reflection.
Double	averageTypeValueSize(RelDataType type) Estimates the average size (in bytes) of a value of a type.
double	typeValueSize(RelDataType type, Comparable value) Estimates the average size (in bytes) of a value of a type.

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

Source for BuiltInMetadata.Size.

BYTES_PER_CHARACTER

public static final int BYTES_PER_CHARACTER

Bytes per character (2).

See Also:

Constant Field Values

Constructor Detail

RelMdSize

protected RelMdSize()

Method Detail

averageRowSize

public Double averageRowSize(RelNode rel)

Catch-all implementation for BuiltInMetadata.Size.averageRowSize(), invoked using reflection.

See Also:

RelMetadataQuery.getAverageRowSize(org.apache.calcite.rel.RelNode)

averageColumnSizes

public List<Double> averageColumnSizes(RelNode rel)

Catch-all implementation for BuiltInMetadata.Size.averageColumnSizes(), invoked using reflection.

See Also:

RelMetadataQuery.getAverageColumnSizes(org.apache.calcite.rel.RelNode)

averageColumnSizes

public List<Double> averageColumnSizes(Filter rel)

averageColumnSizes

public List<Double> averageColumnSizes(Sort rel)

averageColumnSizes

public List<Double> averageColumnSizes(Exchange rel)

averageColumnSizes

public List<Double> averageColumnSizes(Project rel)

averageColumnSizes

public List<Double> averageColumnSizes(Values rel)

averageColumnSizes

public List<Double> averageColumnSizes(TableScan rel)

averageColumnSizes

public List<Double> averageColumnSizes(Aggregate rel)

averageColumnSizes

public List<Double> averageColumnSizes(SemiJoin rel)

averageColumnSizes

public List<Double> averageColumnSizes(Join rel)

averageColumnSizes

public List<Double> averageColumnSizes(Intersect rel)

averageColumnSizes

public List<Double> averageColumnSizes(Minus rel)

averageColumnSizes

public List<Double> averageColumnSizes(Union rel)

averageFieldValueSize

protected Double averageFieldValueSize(RelDataTypeField field)

Estimates the average size (in bytes) of a value of a field, knowing nothing more than its type.

We assume that the proportion of nulls is negligible, even if the field is nullable.

averageTypeValueSize

public Double averageTypeValueSize(RelDataType type)

Estimates the average size (in bytes) of a value of a type.

We assume that the proportion of nulls is negligible, even if the type is nullable.

typeValueSize

public double typeValueSize(RelDataType type,
                   Comparable value)

Estimates the average size (in bytes) of a value of a type.

Nulls count as 1 byte.

averageRexSize

public Double averageRexSize(RexNode node,
                    List<Double> inputColumnSizes)