org.apache.calcite.rel.metadata

Class BuiltInMetadata

java.lang.Object

org.apache.calcite.rel.metadata.BuiltInMetadata

public abstract class BuiltInMetadata
extends Object

Contains the interfaces for several common forms of metadata.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	BuiltInMetadata.Collation Metadata about which columns are sorted.
static interface	BuiltInMetadata.ColumnOrigin Metadata about the origins of columns.
static interface	BuiltInMetadata.ColumnUniqueness Metadata about whether a set of columns uniquely identifies a row.
static interface	BuiltInMetadata.CumulativeCost Metadata about the cost of evaluating a relational expression, including all of its inputs.
static interface	BuiltInMetadata.DistinctRowCount Metadata about the number of distinct rows returned by a set of columns in a relational expression.
static interface	BuiltInMetadata.Distribution Metadata about how a relational expression is distributed.
static interface	BuiltInMetadata.ExplainVisibility Metadata about whether a relational expression should appear in a plan.
static interface	BuiltInMetadata.Memory Metadata about the memory use of an operator.
static interface	BuiltInMetadata.NonCumulativeCost Metadata about the cost of evaluating a relational expression, not including its inputs.
static interface	BuiltInMetadata.Parallelism Metadata about the degree of parallelism of a relational expression, and how its operators are assigned to processes with independent resource pools.
static interface	BuiltInMetadata.PercentageOriginalRows Metadata about the proportion of original rows that remain in a relational expression.
static interface	BuiltInMetadata.PopulationSize Metadata about the number of distinct values in the original source of a column or set of columns.
static interface	BuiltInMetadata.Predicates Metadata about the predicates that hold in the rows emitted from a relational expression.
static interface	BuiltInMetadata.RowCount Metadata about the number of rows returned by a relational expression.
static interface	BuiltInMetadata.Selectivity Metadata about the selectivity of a predicate.
static interface	BuiltInMetadata.Size Metadata about the size of rows and columns.
static interface	BuiltInMetadata.UniqueKeys Metadata about which combinations of columns are unique identifiers.

Constructor Summary

Constructors

Constructor and Description
BuiltInMetadata()

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BuiltInMetadata

public BuiltInMetadata()