ReorderFixedAlt (Apache Jena ARQ)

java.lang.Object
- org.apache.jena.sparql.engine.optimizer.reorder.ReorderTransformationSubstitution
- - org.apache.jena.sparql.engine.optimizer.reorder.ReorderFixedAlt

All Implemented Interfaces:

ReorderTransformation
```
public class ReorderFixedAlt
extends ReorderTransformationSubstitution
```
Alternative fixed reorder function. This corresponds to the algorithm prior to Jena 2.11.2. It is susceptible to picking bad orders when there are lots of non-characteristic (non-selective) rdf:type triples.
The default "ReorderFixed" is better in most cases because it avoids "? rdf:type T" which can be very unselective. Being data independent, that is a guess. Consider using the stats matcher for detailed control.

Field Summary

Fields
Modifier and Type	Field	Description
`static StatsMatcher`	`matcher`
`static int`	`MultiTermMax`	Maximum value for a match involving two terms.
`static int`	`MultiTermSampleSize`	The number of triples used for the base scale

Fields inherited from class org.apache.jena.sparql.engine.optimizer.reorder.ReorderTransformationSubstitution
log

Constructor Summary

Constructors
Constructor Description

ReorderFixedAlt()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description

double weight(PatternTriple pt)
- Methods inherited from class org.apache.jena.sparql.engine.optimizer.reorder.ReorderTransformationSubstitution
  reorder, reorderIndexes
- Methods inherited from class java.lang.Object
  equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - MultiTermSampleSize
```
public static int MultiTermSampleSize
```
    The number of triples used for the base scale
  - MultiTermMax
```
public static int MultiTermMax
```
    Maximum value for a match involving two terms.
  - matcher
```
public static final StatsMatcher matcher
```
- Constructor Detail
  - ReorderFixedAlt
```
public ReorderFixedAlt()
```
- Method Detail
  - weight
```
public double weight(PatternTriple pt)
```