Top Description Fields Constructors Methods
org.h2.table

public Class Plan

extends Object
Class Inheritance
Imports
java.util.ArrayList, .Arrays, .HashMap, org.h2.command.query.AllColumnsForPlan, org.h2.engine.SessionLocal, org.h2.expression.Expression, .ExpressionVisitor, org.h2.message.Trace
A possible query execution plan. The time required to execute a query depends on the order the tables are accessed.

Field Summary

Modifier and TypeField and Description
private final Expression[]
allConditions

private final TableFilter[]
allFilters

private final TableFilter[]
filters

private final HashMap<TableFilter, PlanItem>
planItems

Constructor Summary

AccessConstructor and Description
public
Plan(TableFilter[]
the tables of the query
filters, int
the number of table items
count, Expression
the condition in the WHERE clause
condition)

Create a query plan with the given order.

Method Summary

Modifier and TypeMethod and Description
public double

Returns:

the cost
calculateCost(SessionLocal
the session
session, AllColumnsForPlan
calculates all columns on-demand
allColumnsSet)

Calculate the cost of this query plan.

public TableFilter[]

Returns:

the list of tables
getFilters()

The the list of tables.

public PlanItem

Returns:

the plan item
getItem(TableFilter
the table
filter)

Get the plan item for the given table.

public void
removeUnusableIndexConditions()

Remove all index conditions that can not be used.

private void
setEvaluatable(TableFilter filter, boolean b)

Inherited from java.lang.Object:
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Field Detail

allConditionsback to summary
private final Expression[] allConditions
allFiltersback to summary
private final TableFilter[] allFilters
filtersback to summary
private final TableFilter[] filters
planItemsback to summary
private final HashMap<TableFilter, PlanItem> planItems

Constructor Detail

Planback to summary
public Plan(TableFilter[] filters, int count, Expression condition)

Create a query plan with the given order.

Parameters
filters:TableFilter[]

the tables of the query

count:int

the number of table items

condition:Expression

the condition in the WHERE clause

Method Detail

calculateCostback to summary
public double calculateCost(SessionLocal session, AllColumnsForPlan allColumnsSet)

Calculate the cost of this query plan.

Parameters
session:SessionLocal

the session

allColumnsSet:AllColumnsForPlan

calculates all columns on-demand

Returns:double

the cost

getFiltersback to summary
public TableFilter[] getFilters()

The the list of tables.

Returns:TableFilter[]

the list of tables

getItemback to summary
public PlanItem getItem(TableFilter filter)

Get the plan item for the given table.

Parameters
filter:TableFilter

the table

Returns:PlanItem

the plan item

removeUnusableIndexConditionsback to summary
public void removeUnusableIndexConditions()

Remove all index conditions that can not be used.

setEvaluatableback to summary
private void setEvaluatable(TableFilter filter, boolean b)