public class OptimizerFactoryImpl extends java.lang.Object implements ModuleControl, OptimizerFactory
Modifier and Type | Field and Description |
---|---|
private boolean |
joinOrderOptimization |
protected JoinStrategy[] |
joinStrategySet |
protected int |
maxMemoryPerTable |
protected boolean |
noTimeout |
protected java.lang.String |
optimizerId |
protected boolean |
ruleBasedOptimization |
protected boolean |
useStatistics |
MODULE
Constructor and Description |
---|
OptimizerFactoryImpl() |
Modifier and Type | Method and Description |
---|---|
void |
boot(boolean create,
java.util.Properties startParams)
Boot this module with the given properties.
|
boolean |
doJoinOrderOptimization()
Tell whether to do join order optimization.
|
CostEstimate |
getCostEstimate()
Return a new CostEstimate.
|
int |
getMaxMemoryPerTable()
Return the maxMemoryPerTable setting, this is used in
optimizer, as well as subquery materialization at run time.
|
Optimizer |
getOptimizer(OptimizableList optimizableList,
OptimizablePredicateList predList,
DataDictionary dDictionary,
RequiredRowOrdering requiredRowOrdering,
int numTablesInQuery,
OptimizerPlan overridingPlan,
LanguageConnectionContext lcc)
Only one optimizer level should exist in the database, however, the
connection may have multiple instances of that optimizer
at a given time.
|
protected Optimizer |
getOptimizerImpl(OptimizableList optimizableList,
OptimizablePredicateList predList,
DataDictionary dDictionary,
RequiredRowOrdering requiredRowOrdering,
int numTablesInQuery,
OptimizerPlan overridingPlan,
LanguageConnectionContext lcc) |
void |
stop()
Stop the module.
|
boolean |
supportsOptimizerTrace()
Return whether or not the optimizer associated with
this factory supports optimizer trace.
|
protected java.lang.String optimizerId
protected boolean ruleBasedOptimization
protected boolean noTimeout
protected boolean useStatistics
protected int maxMemoryPerTable
protected JoinStrategy[] joinStrategySet
private boolean joinOrderOptimization
public void boot(boolean create, java.util.Properties startParams) throws StandardException
ModuleControl
An implementation's boot method can throw StandardException. If it is thrown the module is not registered by the monitor and therefore cannot be found through a findModule(). In this case the module's stop() method is not called, thus throwing this exception must free up any resources.
When create is true the contents of the properties object
will be written to the service.properties of the persistent
service. Thus any code that requires an entry in service.properties
must explicitly place the value in this properties set
using the put method.
Typically the properties object contains one or more default
properties sets, which are not written out to service.properties.
These default sets are how callers modify the create process. In a
JDBC connection database create the first set of defaults is a properties
object that contains the attributes that were set on the jdbc:derby: URL.
This attributes properties set has the second default properties set as
its default. This set (which could be null) contains the properties
that the user set on their DriverManager.getConnection() call, and are thus
not owned by Derby code, and thus must not be modified by Derby
code.
When create is false the properties object contains all the properties set in the service.properties file plus a limited number of attributes from the JDBC URL attributes or connection properties set. This avoids properties set by the user compromising the boot process. An example of a property passed in from the JDBC world is the bootPassword for encrypted databases.
Code should not hold onto the passed in properties reference after boot time as its contents may change underneath it. At least after the complete boot is completed, the links to all the default sets will be removed.
boot
in interface ModuleControl
StandardException
- Module cannot be started.Monitor
,
ModuleFactory
public void stop()
ModuleControl
stop
in interface ModuleControl
Monitor
,
ModuleFactory
public Optimizer getOptimizer(OptimizableList optimizableList, OptimizablePredicateList predList, DataDictionary dDictionary, RequiredRowOrdering requiredRowOrdering, int numTablesInQuery, OptimizerPlan overridingPlan, LanguageConnectionContext lcc) throws StandardException
OptimizerFactory
getOptimizer
in interface OptimizerFactory
optimizableList
- The list of Optimizables to optimize.predList
- The list of unassigned OptimizablePredicates.dDictionary
- The DataDictionary to use.requiredRowOrdering
- The required ordering of the rows to
come out of the optimized result setnumTablesInQuery
- The number of tables in the current queryoverridingPlan
- (Optional) A complete plan specified by optimizer overrides. Must have been bound already.lcc
- The LanguageConnectionContext
RESOLVE - We probably want to pass a subquery list, once we define a
new interface for them, so that the Optimizer can out where to attach
the subqueries.StandardException
- Thrown on errorOptimizerFactory.getOptimizer(org.apache.derby.iapi.sql.compile.OptimizableList, org.apache.derby.iapi.sql.compile.OptimizablePredicateList, org.apache.derby.iapi.sql.dictionary.DataDictionary, org.apache.derby.iapi.sql.compile.RequiredRowOrdering, int, org.apache.derby.iapi.sql.compile.OptimizerPlan, org.apache.derby.iapi.sql.conn.LanguageConnectionContext)
public CostEstimate getCostEstimate()
OptimizerFactory
getCostEstimate
in interface OptimizerFactory
OptimizerFactory.getCostEstimate()
public boolean supportsOptimizerTrace()
OptimizerFactory
supportsOptimizerTrace
in interface OptimizerFactory
OptimizerFactory.supportsOptimizerTrace()
protected Optimizer getOptimizerImpl(OptimizableList optimizableList, OptimizablePredicateList predList, DataDictionary dDictionary, RequiredRowOrdering requiredRowOrdering, int numTablesInQuery, OptimizerPlan overridingPlan, LanguageConnectionContext lcc) throws StandardException
StandardException
public int getMaxMemoryPerTable()
OptimizerFactory
getMaxMemoryPerTable
in interface OptimizerFactory
OptimizerFactory.getMaxMemoryPerTable()
public boolean doJoinOrderOptimization()
OptimizerFactory
doJoinOrderOptimization
in interface OptimizerFactory
true
means do join order optimization, false
means don't do it.Apache Derby V10.13 Internals - Copyright © 2004,2016 The Apache Software Foundation. All Rights Reserved.