simpledb.planner
Class BasicQueryPlanner

java.lang.Object
  simpledb.planner.BasicQueryPlanner

All Implemented Interfaces:

QueryPlanner

public class BasicQueryPlanner
extends Object
implements QueryPlanner

The simplest, most naive query planner possible.

Author:

Edward Sciore

Constructor Summary

BasicQueryPlanner()

Method Summary

Plan	createPlan(QueryData data, Transaction tx) Creates a query plan as follows.

Methods inherited from class java.lang.Object

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

Constructor Detail

BasicQueryPlanner

public BasicQueryPlanner()

Method Detail

createPlan

public Plan createPlan(QueryData data,
                       Transaction tx)

Creates a query plan as follows. It first takes the product of all tables and views; it then selects on the predicate; and finally it projects on the field list.

Specified by:

createPlan in interface QueryPlanner

Parameters:

data - the parsed representation of the query

tx - the calling transaction

Returns:

a plan for that query