NoopJoinableFactory (druid-processing 28.0.0 API)

java.lang.Object
- org.apache.druid.segment.join.NoopJoinableFactory

All Implemented Interfaces:: JoinableFactory

public class NoopJoinableFactory
extends Object
implements JoinableFactory

Field Summary

Fields
Modifier and Type Field Description

static NoopJoinableFactory INSTANCE

Constructor Summary

Constructors
Modifier Constructor Description

protected NoopJoinableFactory()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Optional<Joinable>`	`build(DataSource dataSource, JoinConditionAnalysis condition)`	Create a Joinable object.
`boolean`	`isDirectlyJoinable(DataSource dataSource)`	Returns true if a `Joinable` may be created for a given `DataSource`, but is not a guarantee that `JoinableFactory.build(org.apache.druid.query.DataSource, org.apache.druid.segment.join.JoinConditionAnalysis)` will return a non-empty result.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.druid.segment.join.JoinableFactory
computeJoinCacheKey

- Field Detail
  - INSTANCE
```
public static final NoopJoinableFactory INSTANCE
```
- Constructor Detail
  - NoopJoinableFactory
```
protected NoopJoinableFactory()
```
- Method Detail
  - isDirectlyJoinable
```
public boolean isDirectlyJoinable(DataSource dataSource)
```
    Description copied from interface: JoinableFactory
    
    Returns true if a Joinable **may** be created for a given DataSource, but is not a guarantee that JoinableFactory.build(org.apache.druid.query.DataSource, org.apache.druid.segment.join.JoinConditionAnalysis) will return a non-empty result. Successfully building a Joinable might require specific criteria of the JoinConditionAnalysis.
    
    Specified by:
    
    isDirectlyJoinable in interface JoinableFactory
  - build
```
public Optional<Joinable> build(DataSource dataSource,
                                JoinConditionAnalysis condition)
```
    Description copied from interface: JoinableFactory
    
    Create a Joinable object. This may be an expensive operation involving loading data, creating a hash table, etc.
    
    Specified by:
    
    build in interface JoinableFactory
    
    Parameters:
    
    dataSource - the datasource to join on
    
    condition - the condition to join on
    
    Returns:
    
    a Joinable if this datasource + condition combo is joinable; empty if not