Package dev.roanh.gmark.query.shape

Class StarGenerator

java.lang.Object

dev.roanh.gmark.query.shape.ShapeGenerator

dev.roanh.gmark.query.shape.StarGenerator

public class StarGenerator
extends ShapeGenerator

A query generator that generates queries with the conjuncts arranged in a star shape. Specifically, all the conjuncts share the same source variable.

Field Summary

Fields inherited from class dev.roanh.gmark.query.shape.ShapeGenerator

conjGen, gSel, workload

Constructor Summary

Constructors

Constructor	Description
StarGenerator(Workload workload)	Constructs a new generator for star shaped queries.

Method Summary

Modifier and Type	Method	Description
Query	generateQuery()	Generates a new query with a specific shape following the provided workload specification.

Methods inherited from class dev.roanh.gmark.query.shape.ShapeGenerator

createVariables, randomArity, randomConjunctNumber, randomSelectivity

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

StarGenerator

public StarGenerator(Workload workload)

Constructs a new generator for star shaped queries.

Parameters:

workload - The workload specification.

Method Details

generateQuery

public Query generateQuery()
                    throws GenerationException

Description copied from class: ShapeGenerator

Generates a new query with a specific shape following the provided workload specification.

Specified by:

generateQuery in class ShapeGenerator

Returns:

The generated query.

Throws:

GenerationException - When generating the query failed for some reason.