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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.iapi.sql.compile

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Class Diagram

Java Document (Java Doc)

org.apache.derby.iapi.sql.compile .AccessPath

All known Subclasses:   org.apache.derby.impl.sql.compile .AccessPathImpl,
AccessPath
public interface AccessPath (Code)
AccessPath represents a proposed access path for an Optimizable. An Optimizable may have more than one proposed AccessPath.

Method Summary
public void copy(AccessPath copyFrom)
     Copy all information from the given AccessPath to this one.
ConglomerateDescriptor getConglomerateDescriptor()
     Get whatever was last set as the conglomerate descriptor.
public CostEstimate getCostEstimate()
     Get the cost estimate for this AccessPath.
public boolean getCoveringIndexScan()
     Return whether or not the optimizer is considering a covering index scan on this AccessPath.
public JoinStrategy getJoinStrategy()
     Get the join strategy, as set by setJoinStrategy().
public int getLockMode()
     Get the lock mode, as last set in setLockMode().
public boolean getNonMatchingIndexScan()
     Return whether or not the optimizer is considering a non-matching index scan on this AccessPath.
public Optimizer getOptimizer()
     Get the optimizer associated with this access path.
public void initializeAccessPathName(DataDictionary dd, TableDescriptor td)
     Sets the "name" of the access path.
void setConglomerateDescriptor(ConglomerateDescriptor cd)
     Set the conglomerate descriptor for this access path.
public void setCostEstimate(CostEstimate costEstimate)
     Set the given cost estimate in this AccessPath.
public void setCoveringIndexScan(boolean coveringIndexScan)
     Set whether or not to consider a covering index scan on the optimizable.
public void setJoinStrategy(JoinStrategy joinStrategy)

public void setLockMode(int lockMode)

public void setNonMatchingIndexScan(boolean nonMatchingIndexScan)
     Set whether or not to consider a non-matching index scan on this AccessPath.

Method Detail
copy
public void copy(AccessPath copyFrom)(Code)
Copy all information from the given AccessPath to this one.

getConglomerateDescriptor
ConglomerateDescriptor getConglomerateDescriptor()(Code)
Get whatever was last set as the conglomerate descriptor. Returns null if nothing was set since the last call to startOptimizing()

getCostEstimate
public CostEstimate getCostEstimate()(Code)
Get the cost estimate for this AccessPath. This is the last one set by setCostEstimate.

getCoveringIndexScan
public boolean getCoveringIndexScan()(Code)
Return whether or not the optimizer is considering a covering index scan on this AccessPath. boolean Whether or not the optimizer chose a coveringindex scan.

getJoinStrategy
public JoinStrategy getJoinStrategy()(Code)
Get the join strategy, as set by setJoinStrategy().

getLockMode
public int getLockMode()(Code)
Get the lock mode, as last set in setLockMode().

getNonMatchingIndexScan
public boolean getNonMatchingIndexScan()(Code)
Return whether or not the optimizer is considering a non-matching index scan on this AccessPath. We expect to call this during generation, after access path selection is complete. boolean Whether or not the optimizer is consideringa non-matching index scan.

getOptimizer
public Optimizer getOptimizer()(Code)
Get the optimizer associated with this access path. The optimizer associated with this access path.

initializeAccessPathName
public void initializeAccessPathName(DataDictionary dd, TableDescriptor td) throws StandardException(Code)
Sets the "name" of the access path. if the access path represents an index then set the name to the name of the index. if it is an index created for a constraint, use the constraint name. This is called only for base tables.
Parameters:
  td - TableDescriptor of the base table.
Parameters:
  dd - Datadictionary.
exception:
  StandardException - on error.

setConglomerateDescriptor
void setConglomerateDescriptor(ConglomerateDescriptor cd)(Code)
Set the conglomerate descriptor for this access path.
Parameters:
  cd - A ConglomerateDescriptor

setCostEstimate
public void setCostEstimate(CostEstimate costEstimate)(Code)
Set the given cost estimate in this AccessPath. Generally, this will be the CostEstimate for the plan currently under consideration.

setCoveringIndexScan
public void setCoveringIndexScan(boolean coveringIndexScan)(Code)
Set whether or not to consider a covering index scan on the optimizable.

setJoinStrategy
public void setJoinStrategy(JoinStrategy joinStrategy)(Code)
Remember the given join strategy
Parameters:
  joinStrategy - The best join strategy

setLockMode
public void setLockMode(int lockMode)(Code)
Set the lock mode

setNonMatchingIndexScan
public void setNonMatchingIndexScan(boolean nonMatchingIndexScan)(Code)
Set whether or not to consider a non-matching index scan on this AccessPath.

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