Package 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	Description
static final int	BYTES_PER_CHARACTER	Bytes per character (2).
static final RelMetadataProvider	SOURCE	Source for BuiltInMetadata.Size.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	RelMdSize()

Method Summary

Modifier and Type	Method	Description
List<@Nullable Double>	averageColumnSizes(Aggregate rel, RelMetadataQuery mq)
@Nullable List<@Nullable Double>	averageColumnSizes(Calc rel, RelMetadataQuery mq)
@Nullable List<@Nullable Double>	averageColumnSizes(Exchange rel, RelMetadataQuery mq)
@Nullable List<@Nullable Double>	averageColumnSizes(Filter rel, RelMetadataQuery mq)
@Nullable List<@Nullable Double>	averageColumnSizes(Intersect rel, RelMetadataQuery mq)
@Nullable List<@Nullable Double>	averageColumnSizes(Join rel, RelMetadataQuery mq)
@Nullable List<@Nullable Double>	averageColumnSizes(Minus rel, RelMetadataQuery mq)
@Nullable List<@Nullable Double>	averageColumnSizes(Project rel, RelMetadataQuery mq)
@Nullable List<@Nullable Double>	averageColumnSizes(Sort rel, RelMetadataQuery mq)
@Nullable List<@Nullable Double>	averageColumnSizes(TableModify rel, RelMetadataQuery mq)
@Nullable List<@Nullable Double>	averageColumnSizes(TableScan rel, RelMetadataQuery mq)
@Nullable List<@Nullable Double>	averageColumnSizes(Union rel, RelMetadataQuery mq)
@Nullable List<@Nullable Double>	averageColumnSizes(Values rel, RelMetadataQuery mq)
@Nullable List<@Nullable Double>	averageColumnSizes(RelNode rel, RelMetadataQuery mq)	Catch-all implementation for BuiltInMetadata.Size.averageColumnSizes(), invoked using reflection.
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 @Nullable 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.
Double	computeSizeForNestedType(RexCall call, List<? extends @Nullable Double> inputColumnSizes)	Returns size for nested type ARRAY/MAP.
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

Field Details

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 Details

RelMdSize

protected RelMdSize()

Method Details

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

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

averageColumnSizes

public @Nullable List<@Nullable 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.

computeSizeForNestedType

public Double computeSizeForNestedType(RexCall call,
 List<? extends @Nullable Double> inputColumnSizes)

Returns size for nested type ARRAY/MAP.

averageRexSize

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