Package dev.roanh.gmark.query.shape

Class ChainGenerator

java.lang.Object

dev.roanh.gmark.query.shape.ShapeGenerator

dev.roanh.gmark.query.shape.ChainGenerator

public class ChainGenerator
extends ShapeGenerator

A query generator that generates queries with the conjuncts arranged in a chain shape. Specifically, the target variable of a conjunct is the same as the source variable of the next conjunct in the chain.

Field Summary

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

conjGen, gSel, workload

Constructor Summary

Constructors

Constructor	Description
ChainGenerator(Workload workload)	Constructs a new generator for 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

ChainGenerator

public ChainGenerator(Workload workload)

Constructs a new generator for 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.