org.apache.calcite.rel.metadata

Class RelMdDistribution

java.lang.Object

org.apache.calcite.rel.metadata.RelMdDistribution

public class RelMdDistribution
extends Object

RelMdCollation supplies a default implementation of RelMetadataQuery.distribution(org.apache.calcite.rel.RelNode) for the standard logical algebra.

Field Summary

Fields

Modifier and Type	Field and Description
static RelMetadataProvider	SOURCE

Method Summary

Methods

Modifier and Type	Method and Description
static RelDistribution	calc(RelNode input, RexProgram program) Helper method to determine a Calc's distribution.
RelDistribution	distribution(BiRel rel)
RelDistribution	distribution(Exchange exchange)
RelDistribution	distribution(HepRelVertex rel)
RelDistribution	distribution(Project project)
RelDistribution	distribution(RelNode rel) Fallback method to deduce distribution for any relational expression not handled by a more specific method.
RelDistribution	distribution(SetOp rel)
RelDistribution	distribution(SingleRel rel)
RelDistribution	distribution(TableScan scan)
RelDistribution	distribution(Values values)
static RelDistribution	exchange(RelDistribution distribution) Helper method to determine an Exchange's or SortExchange's distribution.
static RelDistribution	filter(RelNode input) Helper method to determine a Filter's distribution.
static RelDistribution	limit(RelNode input) Helper method to determine a limit's distribution.
static RelDistribution	project(RelNode input, List<? extends RexNode> projects) Helper method to determine a Project's collation.
static RelDistribution	sort(RelNode input) Helper method to determine a Sort's distribution.
static RelDistribution	table(RelOptTable table) Helper method to determine a TableScan's collation.
static RelDistribution	values(RelDataType rowType, com.google.common.collect.ImmutableList<com.google.common.collect.ImmutableList<RexLiteral>> tuples) Helper method to determine a Values's distribution.

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

Method Detail

distribution

public RelDistribution distribution(RelNode rel)

Fallback method to deduce distribution for any relational expression not handled by a more specific method.

Parameters:

rel - Relational expression

Returns:

Relational expression's distribution

distribution

public RelDistribution distribution(SingleRel rel)

distribution

public RelDistribution distribution(BiRel rel)

distribution

public RelDistribution distribution(SetOp rel)

distribution

public RelDistribution distribution(TableScan scan)

distribution

public RelDistribution distribution(Project project)

distribution

public RelDistribution distribution(Values values)

distribution

public RelDistribution distribution(Exchange exchange)

distribution

public RelDistribution distribution(HepRelVertex rel)

table

public static RelDistribution table(RelOptTable table)

Helper method to determine a TableScan's collation.

sort

public static RelDistribution sort(RelNode input)

Helper method to determine a Sort's distribution.

filter

public static RelDistribution filter(RelNode input)

Helper method to determine a Filter's distribution.

limit

public static RelDistribution limit(RelNode input)

Helper method to determine a limit's distribution.

calc

public static RelDistribution calc(RelNode input,
                   RexProgram program)

Helper method to determine a Calc's distribution.

project

public static RelDistribution project(RelNode input,
                      List<? extends RexNode> projects)

Helper method to determine a Project's collation.

values

public static RelDistribution values(RelDataType rowType,
                     com.google.common.collect.ImmutableList<com.google.common.collect.ImmutableList<RexLiteral>> tuples)

Helper method to determine a Values's distribution.

exchange

public static RelDistribution exchange(RelDistribution distribution)

Helper method to determine an Exchange's or SortExchange's distribution.