RelOptCluster (Calcite Core 1.2.0-incubating API)

```
public class RelOptCluster
extends Object
```
An environment for related relational expressions during the optimization of a query.

Methods
Modifier and Type	Method and Description
`MetadataFactory`	`getMetadataFactory()`
`RelMetadataProvider`	`getMetadataProvider()`
`RexNode`	`getOriginalExpression()`
`RelOptPlanner`	`getPlanner()`
`RelOptQuery`	`getQuery()`
`RexBuilder`	`getRexBuilder()`
`RelDataTypeFactory`	`getTypeFactory()`
`void`	`setMetadataProvider(RelMetadataProvider metadataProvider)` Overrides the default metadata provider for this cluster.
`void`	`setOriginalExpression(RexNode originalExpression)`
`RelTraitSet`	`traitSet()` Returns the default trait set for this cluster.
`RelTraitSet`	`traitSetOf(RelTrait... traits)` Deprecated. For `traitSetOf(t1, t2)`, use `traitSet()`().replace(t1).replace(t2).
`RelTraitSet`	`traitSetOf(RelTrait trait)`

public RexNode getOriginalExpression()

public void setOriginalExpression(RexNode originalExpression)

public RelDataTypeFactory getTypeFactory()

public RelMetadataProvider getMetadataProvider()

public MetadataFactory getMetadataFactory()

traitSet
```
public RelTraitSet traitSet()
```
Returns the default trait set for this cluster.

public RelTraitSet traitSetOf(RelTrait trait)

Class RelOptCluster