Lookup (presto-main 348 API)

```
public interface Lookup
```

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Default Methods Deprecated Methods
Modifier and Type	Method	Description
`static Lookup`	`from(Function<GroupReference,Stream<PlanNode>> resolver)`
`static Lookup`	`noLookup()`	A Lookup implementation that does not perform lookup.
`default PlanNode`	`resolve(PlanNode node)`	Deprecated.
`Stream<PlanNode>`	`resolveGroup(PlanNode node)`	Resolves nodes by materializing GroupReference nodes representing symbolic references to other nodes.

- Method Detail
  - resolve
```
@Deprecated
default PlanNode resolve(PlanNode node)
```
    Deprecated.
    
    Resolves a node by materializing GroupReference nodes representing symbolic references to other nodes. This method is deprecated since is assumes group contains only one node.
    If the node is not a GroupReference, it returns the argument as is.
  - resolveGroup
```
Stream<PlanNode> resolveGroup(PlanNode node)
```
    Resolves nodes by materializing GroupReference nodes representing symbolic references to other nodes.
    
    Throws:
    
    IllegalArgumentException - if the node is not a GroupReference
  - noLookup
```
static Lookup noLookup()
```
    A Lookup implementation that does not perform lookup. It satisfies contract by rejecting GroupReference-s.
  - from
```
static Lookup from(Function<GroupReference,Stream<PlanNode>> resolver)
```