Package org.apache.calcite.rel.metadata

Interface BuiltInMetadata.PercentageOriginalRows

All Superinterfaces:

Metadata

Enclosing class:

BuiltInMetadata

public static interface BuiltInMetadata.PercentageOriginalRows
extends Metadata

Metadata about the proportion of original rows that remain in a relational expression.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	BuiltInMetadata.PercentageOriginalRows.Handler	Handler API.

Field Summary

Fields

Modifier and Type	Field	Description
static final MetadataDef<BuiltInMetadata.PercentageOriginalRows>	DEF

Method Summary

Modifier and Type	Method	Description
@Nullable Double	getPercentageOriginalRows()	Estimates the percentage of the number of rows actually produced by a relational expression out of the number of rows it would produce if all single-table filter conditions were removed.

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

rel

Field Details

DEF

static final MetadataDef<BuiltInMetadata.PercentageOriginalRows> DEF

Method Details

getPercentageOriginalRows

@Nullable Double getPercentageOriginalRows()

Estimates the percentage of the number of rows actually produced by a relational expression out of the number of rows it would produce if all single-table filter conditions were removed.

Returns:

estimated percentage (between 0.0 and 1.0), or null if no reliable estimate can be determined