net.sf.saffron.oj.rel
Class JavaNestedLoopJoinRel

java.lang.Object
  |
  +--net.sf.saffron.rel.SaffronRel
        |
        +--net.sf.saffron.rel.JoinRel
              |
              +--net.sf.saffron.oj.rel.JavaNestedLoopJoinRel

All Implemented Interfaces:

JavaRel

public class JavaNestedLoopJoinRel

extends JoinRel

implements JavaRel

Implements the JoinRel relational expression using the nested-loop algorithm, with output as Java code.

Nested Class Summary

Nested classes inherited from class net.sf.saffron.rel.JoinRel

JoinRel.JoinType

Field Summary

Fields inherited from class net.sf.saffron.rel.JoinRel

condition, joinType, left, right, variablesStopped

Fields inherited from class net.sf.saffron.rel.SaffronRel

cluster, digest, id, rowType

Constructor Summary

JavaNestedLoopJoinRel(VolcanoCluster cluster, SaffronRel left, SaffronRel right, RexNode condition, int joinType, Set variablesStopped)

Method Summary

Object	clone()
PlanCost	computeSelfCost(SaffronPlanner planner) Returns the cost of this plan (not including children).
CallingConvention	getConvention() Returns a value from CallingConvention.
Object	implement(RelImplementor implementor, int ordinal) Create a plan for this expression according to a calling convention.
Expression	implementSelf(RelImplementor implementor) Returns a Java expression which yields the current row of this relational expression.

Methods inherited from class net.sf.saffron.rel.JoinRel

childrenAccept, deriveRowType, explain, getChildExps, getCondition, getInputs, getJoinType, getLeft, getRight, getVariablesStopped, registerStoppedVariable, replaceInput, setVariablesStopped, switchJoinType

Methods inherited from class net.sf.saffron.rel.SaffronRel

computeDigest, getCluster, getCorrelVariable, getId, getInput, getOrCreateCorrelVariable, getQualifier, getQuery, getRelTypeName, getRows, getRowType, getTable, implementFieldAccess, isAccessTo, isDistinct, onRegister, recomputeDigest, register, registerCorrelVariable, setCorrelVariable, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

JavaNestedLoopJoinRel

public JavaNestedLoopJoinRel(VolcanoCluster cluster,
                             SaffronRel left,
                             SaffronRel right,
                             RexNode condition,
                             int joinType,
                             Set variablesStopped)

Method Detail

getConvention

public CallingConvention getConvention()

Description copied from class: SaffronRel

Returns a value from CallingConvention.

Overrides:

getConvention in class SaffronRel

clone

public Object clone()

Overrides:

clone in class JoinRel

computeSelfCost

public PlanCost computeSelfCost(SaffronPlanner planner)

Description copied from class: SaffronRel

Returns the cost of this plan (not including children). The base implementation throws an error; derived classes should override.

Overrides:

computeSelfCost in class SaffronRel

implement

public Object implement(RelImplementor implementor,
                        int ordinal)

Description copied from class: SaffronRel

Create a plan for this expression according to a calling convention.

Overrides:

implement in class SaffronRel

Parameters:

implementor - implementor

ordinal - indicates our position in the pre-, in- and postfix walk over the tree; ordinal is -1 when called from the parent, and i when called from the i^th child.

implementSelf

public Expression implementSelf(RelImplementor implementor)

Returns a Java expression which yields the current row of this relational expression.

Specified by:

implementSelf in interface JavaRel

See Also:

RelImplementor.bind(SaffronRel,SaffronRel)