org.apache.calcite.rel.metadata

Class RelMdSize

java.lang.Object

org.apache.calcite.rel.metadata.RelMdSize

All Implemented Interfaces:

MetadataHandler<BuiltInMetadata.Size>

public class RelMdSize
extends Object
implements MetadataHandler<BuiltInMetadata.Size>

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

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

getDef

public MetadataDef<BuiltInMetadata.Size> getDef()

Specified by:

getDef in interface MetadataHandler<BuiltInMetadata.Size>

averageRowSize

public Double averageRowSize(RelNode rel,
                             RelMetadataQuery mq)

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,
                                       RelMetadataQuery mq)

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,
                                       RelMetadataQuery mq)

averageColumnSizes

public List<Double> averageColumnSizes(Sort rel,
                                       RelMetadataQuery mq)

averageColumnSizes

public List<Double> averageColumnSizes(Exchange rel,
                                       RelMetadataQuery mq)

averageColumnSizes

public List<Double> averageColumnSizes(Project rel,
                                       RelMetadataQuery mq)

averageColumnSizes

public List<Double> averageColumnSizes(Values rel,
                                       RelMetadataQuery mq)

averageColumnSizes

public List<Double> averageColumnSizes(TableScan rel,
                                       RelMetadataQuery mq)

averageColumnSizes

public List<Double> averageColumnSizes(Aggregate rel,
                                       RelMetadataQuery mq)

averageColumnSizes

public List<Double> averageColumnSizes(SemiJoin rel,
                                       RelMetadataQuery mq)

averageColumnSizes

public List<Double> averageColumnSizes(Join rel,
                                       RelMetadataQuery mq)

averageJoinColumnSizes

private List<Double> averageJoinColumnSizes(Join rel,
                                            RelMetadataQuery mq,
                                            boolean semijoin)

averageColumnSizes

public List<Double> averageColumnSizes(Intersect rel,
                                       RelMetadataQuery mq)

averageColumnSizes

public List<Double> averageColumnSizes(Minus rel,
                                       RelMetadataQuery mq)

averageColumnSizes

public List<Double> averageColumnSizes(Union rel,
                                       RelMetadataQuery mq)

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)