Class OptimizerFactoryImpl
- java.lang.Object
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- org.apache.derby.impl.sql.compile.OptimizerFactoryImpl
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- All Implemented Interfaces:
ModuleControl
,OptimizerFactory
public class OptimizerFactoryImpl extends java.lang.Object implements ModuleControl, OptimizerFactory
This is simply the factory for creating an optimizer.
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Field Summary
Fields Modifier and Type Field Description private boolean
joinOrderOptimization
protected JoinStrategy[]
joinStrategySet
protected int
maxMemoryPerTable
protected boolean
noTimeout
protected java.lang.String
optimizerId
protected boolean
ruleBasedOptimization
protected boolean
useStatistics
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Fields inherited from interface org.apache.derby.iapi.sql.compile.OptimizerFactory
MODULE
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Constructor Summary
Constructors Constructor Description OptimizerFactoryImpl()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method 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.
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Field Detail
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optimizerId
protected java.lang.String optimizerId
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ruleBasedOptimization
protected boolean ruleBasedOptimization
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noTimeout
protected boolean noTimeout
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useStatistics
protected boolean useStatistics
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maxMemoryPerTable
protected int maxMemoryPerTable
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joinStrategySet
protected JoinStrategy[] joinStrategySet
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joinOrderOptimization
private boolean joinOrderOptimization
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Method Detail
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boot
public void boot(boolean create, java.util.Properties startParams) throws StandardException
Description copied from interface:ModuleControl
Boot this module with the given properties. Creates a module instance that can be found using the findModule() methods of Monitor. The module can only be found using one of these findModule() methods once this method has returned.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.
- Specified by:
boot
in interfaceModuleControl
- Throws:
StandardException
- Module cannot be started.- See Also:
Monitor
,ModuleFactory
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stop
public void stop()
Description copied from interface:ModuleControl
Stop the module. The module may be found via a findModule() method until some time after this method returns. Therefore the factory must be prepared to reject requests to it once it has been stopped. In addition other modules may cache a reference to the module and make requests of it after it has been stopped, these requests should be rejected as well.- Specified by:
stop
in interfaceModuleControl
- See Also:
Monitor
,ModuleFactory
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getOptimizer
public Optimizer getOptimizer(OptimizableList optimizableList, OptimizablePredicateList predList, DataDictionary dDictionary, RequiredRowOrdering requiredRowOrdering, int numTablesInQuery, OptimizerPlan overridingPlan, LanguageConnectionContext lcc) throws StandardException
Description copied from interface:OptimizerFactory
Only one optimizer level should exist in the database, however, the connection may have multiple instances of that optimizer at a given time.- Specified by:
getOptimizer
in interfaceOptimizerFactory
- Parameters:
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.- Throws:
StandardException
- Thrown on error- See Also:
OptimizerFactory.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)
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getCostEstimate
public CostEstimate getCostEstimate()
Description copied from interface:OptimizerFactory
Return a new CostEstimate.- Specified by:
getCostEstimate
in interfaceOptimizerFactory
- See Also:
OptimizerFactory.getCostEstimate()
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supportsOptimizerTrace
public boolean supportsOptimizerTrace()
Description copied from interface:OptimizerFactory
Return whether or not the optimizer associated with this factory supports optimizer trace.- Specified by:
supportsOptimizerTrace
in interfaceOptimizerFactory
- Returns:
- Whether or not the optimizer associated with this factory supports optimizer trace.
- See Also:
OptimizerFactory.supportsOptimizerTrace()
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getOptimizerImpl
protected Optimizer getOptimizerImpl(OptimizableList optimizableList, OptimizablePredicateList predList, DataDictionary dDictionary, RequiredRowOrdering requiredRowOrdering, int numTablesInQuery, OptimizerPlan overridingPlan, LanguageConnectionContext lcc) throws StandardException
- Throws:
StandardException
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getMaxMemoryPerTable
public int getMaxMemoryPerTable()
Description copied from interface:OptimizerFactory
Return the maxMemoryPerTable setting, this is used in optimizer, as well as subquery materialization at run time.- Specified by:
getMaxMemoryPerTable
in interfaceOptimizerFactory
- Returns:
- maxMemoryPerTable value
- See Also:
OptimizerFactory.getMaxMemoryPerTable()
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doJoinOrderOptimization
public boolean doJoinOrderOptimization()
Description copied from interface:OptimizerFactory
Tell whether to do join order optimization.- Specified by:
doJoinOrderOptimization
in interfaceOptimizerFactory
- Returns:
true
means do join order optimization,false
means don't do it.
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