Package dev.roanh.gmark.query.shape

Class StarChainGenerator

java.lang.Object

dev.roanh.gmark.query.shape.ShapeGenerator

dev.roanh.gmark.query.shape.StarChainGenerator

public class StarChainGenerator
extends ShapeGenerator

A query generator that generates queries with the conjuncts arranged in a star-chain shape. Specifically, there is one long chain of conjuncts and each end point has a number of conjuncts attached to it to form a star.

Field Summary

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

conjGen, gSel, workload

Constructor Summary

Constructors

Constructor	Description
StarChainGenerator(Workload workload)	Constructs a new generator for star-chain 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

StarChainGenerator

public StarChainGenerator(Workload workload)

Constructs a new generator for star-chain 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.