BuiltInMetadata.NodeTypes (Apache Calcite API)

All Superinterfaces:

Metadata

All Known Subinterfaces:

BuiltInMetadata.All

Enclosing class:

BuiltInMetadata
```
public static interface BuiltInMetadata.NodeTypes
extends Metadata
```
Metadata about the node types in a relational expression.
For each relational expression, it returns a multimap from the class to the nodes instantiating that class. Each node will appear in the multimap only once.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static interface BuiltInMetadata.NodeTypes.Handler
Handler API.

Field Summary

Fields
Modifier and Type Field Description

static MetadataDef<BuiltInMetadata.NodeTypes> DEF

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`com.google.common.collect.Multimap<java.lang.Class<? extends RelNode>,RelNode>`	`getNodeTypes()`	Returns a multimap from the class to the nodes instantiating that class.

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

- Field Detail
  - DEF
```
static final MetadataDef<BuiltInMetadata.NodeTypes> DEF
```
- Method Detail
  - getNodeTypes
```
com.google.common.collect.Multimap<java.lang.Class<? extends RelNode>,RelNode> getNodeTypes()
```
    Returns a multimap from the class to the nodes instantiating that class. The default implementation for a node classifies it as a RelNode.