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)
@Nullable List<Double>	averageColumnSizes(Calc rel, RelMetadataQuery mq)
@Nullable List<Double>	averageColumnSizes(Exchange rel, RelMetadataQuery mq)
@Nullable List<Double>	averageColumnSizes(Filter rel, RelMetadataQuery mq)
@Nullable List<Double>	averageColumnSizes(Intersect rel, RelMetadataQuery mq)
@Nullable List<Double>	averageColumnSizes(Join rel, RelMetadataQuery mq)
@Nullable List<Double>	averageColumnSizes(Minus rel, RelMetadataQuery mq)
@Nullable List<Double>	averageColumnSizes(Project rel, RelMetadataQuery mq)
@Nullable List<Double>	averageColumnSizes(RelNode rel, RelMetadataQuery mq) Catch-all implementation for BuiltInMetadata.Size.averageColumnSizes(), invoked using reflection.
@Nullable List<Double>	averageColumnSizes(Sort rel, RelMetadataQuery mq)
@Nullable List<Double>	averageColumnSizes(TableModify rel, RelMetadataQuery mq)
@Nullable List<Double>	averageColumnSizes(TableScan rel, RelMetadataQuery mq)
@Nullable List<Double>	averageColumnSizes(Union rel, RelMetadataQuery mq)
@Nullable List<Double>	averageColumnSizes(Values rel, RelMetadataQuery mq)
protected @Nullable Double	averageFieldValueSize(RelDataTypeField field) Estimates the average size (in bytes) of a value of a field, knowing nothing more than its type.
@Nullable Double	averageRexSize(RexNode node, List<? extends Double> inputColumnSizes)
@Nullable Double	averageRowSize(RelNode rel, RelMetadataQuery mq) Catch-all implementation for BuiltInMetadata.Size.averageRowSize(), invoked using reflection.
@Nullable Double	averageTypeValueSize(RelDataType type) Estimates the average size (in bytes) of a value of a type.
MetadataDef<BuiltInMetadata.Size>	getDef()
double	typeValueSize(RelDataType type, @Nullable 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

Methods inherited from interface org.apache.calcite.rel.metadata.MetadataHandler

handlerMethods

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 @Nullable 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 @Nullable 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 @Nullable List<Double> averageColumnSizes(Filter rel,
                                                 RelMetadataQuery mq)

averageColumnSizes

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

averageColumnSizes

public @Nullable List<Double> averageColumnSizes(TableModify rel,
                                                 RelMetadataQuery mq)

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

public @Nullable List<Double> averageColumnSizes(Calc rel,
                                                 RelMetadataQuery mq)

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageFieldValueSize

protected @Nullable 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 @Nullable 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,
                            @Nullable Comparable value)

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

Nulls count as 1 byte.

averageRexSize

public @Nullable Double averageRexSize(RexNode node,
                                       List<? extends Double> inputColumnSizes)