org.apache.calcite.rel.metadata

Class RelMdDistribution

java.lang.Object

org.apache.calcite.rel.metadata.RelMdDistribution

All Implemented Interfaces:

MetadataHandler<BuiltInMetadata.Distribution>

public class RelMdDistribution
extends Object
implements MetadataHandler<BuiltInMetadata.Distribution>

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

Modifier and Type	Method and Description
static RelDistribution	calc(RelMetadataQuery mq, RelNode input, RexProgram program) Helper method to determine a Calc's distribution.
RelDistribution	distribution(BiRel rel, RelMetadataQuery mq)
RelDistribution	distribution(Exchange exchange, RelMetadataQuery mq)
RelDistribution	distribution(Project project, RelMetadataQuery mq)
RelDistribution	distribution(RelNode rel, RelMetadataQuery mq) Fallback method to deduce distribution for any relational expression not handled by a more specific method.
RelDistribution	distribution(SetOp rel, RelMetadataQuery mq)
RelDistribution	distribution(SingleRel rel, RelMetadataQuery mq)
RelDistribution	distribution(TableModify rel, RelMetadataQuery mq)
@Nullable RelDistribution	distribution(TableScan scan, RelMetadataQuery mq)
RelDistribution	distribution(Values values, RelMetadataQuery mq)
static RelDistribution	exchange(RelDistribution distribution) Helper method to determine an Exchange's or SortExchange's distribution.
static RelDistribution	filter(RelMetadataQuery mq, RelNode input) Helper method to determine a Filter's distribution.
MetadataDef<BuiltInMetadata.Distribution>	getDef()
static RelDistribution	limit(RelMetadataQuery mq, RelNode input) Helper method to determine a limit's distribution.
static RelDistribution	project(RelMetadataQuery mq, RelNode input, List<? extends RexNode> projects) Helper method to determine a Project's distribution.
static RelDistribution	snapshot(RelMetadataQuery mq, RelNode input) Helper method to determine a Snapshot's distribution.
static RelDistribution	sort(RelMetadataQuery mq, RelNode input) Helper method to determine a Sort's distribution.
static @Nullable RelDistribution	table(RelOptTable table) Helper method to determine a TableScan's distribution.
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

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

handlerMethods

Field Detail

SOURCE

public static final RelMetadataProvider SOURCE

Method Detail

getDef

public MetadataDef<BuiltInMetadata.Distribution> getDef()

Specified by:

getDef in interface MetadataHandler<BuiltInMetadata.Distribution>

distribution

public RelDistribution distribution(RelNode rel,
                                    RelMetadataQuery mq)

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,
                                    RelMetadataQuery mq)

distribution

public RelDistribution distribution(BiRel rel,
                                    RelMetadataQuery mq)

distribution

public RelDistribution distribution(SetOp rel,
                                    RelMetadataQuery mq)

distribution

public RelDistribution distribution(TableModify rel,
                                    RelMetadataQuery mq)

distribution

public @Nullable RelDistribution distribution(TableScan scan,
                                              RelMetadataQuery mq)

distribution

public RelDistribution distribution(Project project,
                                    RelMetadataQuery mq)

distribution

public RelDistribution distribution(Values values,
                                    RelMetadataQuery mq)

distribution

public RelDistribution distribution(Exchange exchange,
                                    RelMetadataQuery mq)

table

public static @Nullable RelDistribution table(RelOptTable table)

Helper method to determine a TableScan's distribution.

snapshot

public static RelDistribution snapshot(RelMetadataQuery mq,
                                       RelNode input)

Helper method to determine a Snapshot's distribution.

sort

public static RelDistribution sort(RelMetadataQuery mq,
                                   RelNode input)

Helper method to determine a Sort's distribution.

filter

public static RelDistribution filter(RelMetadataQuery mq,
                                     RelNode input)

Helper method to determine a Filter's distribution.

limit

public static RelDistribution limit(RelMetadataQuery mq,
                                    RelNode input)

Helper method to determine a limit's distribution.

calc

public static RelDistribution calc(RelMetadataQuery mq,
                                   RelNode input,
                                   RexProgram program)

Helper method to determine a Calc's distribution.

project

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

Helper method to determine a Project's distribution.

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.