saffron.rel.iter
Class IterConcatenate

java.lang.Object
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  +--saffron.rel.Rel
        |
        +--saffron.rel.Union
              |
              +--saffron.rel.iter.IterConcatenate

public class IterConcatenate

extends Union

IterConcatenate concatenates several iterators. It is an iterator implementation of Union.

Nested Class Summary

Nested classes inherited from class saffron.rel.Union

Nested classes inherited from class saffron.rel.Rel

Field Summary

Fields inherited from class saffron.rel.Union

all, inputs

Fields inherited from class saffron.rel.Rel

cluster, digest, id, rowType

Constructor Summary

IterConcatenate(Cluster cluster, Rel[] inputs)

Method Summary

Object	clone()
Cost	computeSelfCost(Planner planner) Returns the cost of this plan (not including children).
CallingConvention	getConvention() Returns a value from CallingConvention.
Object	implement(Implementor implementor, int ordinal) Create a plan for this expression according to a calling convention.

Methods inherited from class saffron.rel.Union

deriveRowType, explain, getInputs, getRows, isDistinct, register, replaceInput

Methods inherited from class saffron.rel.Rel

childrenAccept, computeDigest, getChildExps, getCluster, getCorelVariable, getEnvironment, getId, getInput, getOrCreateCorelVariable, getParentEnv, getQualifier, getQuery, getRelTypeName, getRowType, getTable, getType, getVariablesStopped, implementExp, implementExps, implementFieldAccess, implementSelf, isAccessTo, onRegister, recomputeDigest, registerCorelVariable, setCorelVariable, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

IterConcatenate

public IterConcatenate(Cluster cluster,
                       Rel[] inputs)

Method Detail

clone

public Object clone()

Overrides:

clone in class Union

getConvention

public CallingConvention getConvention()

Description copied from class: Rel

Returns a value from CallingConvention.

Overrides:

getConvention in class Rel

computeSelfCost

public Cost computeSelfCost(Planner planner)

Description copied from class: Rel

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

Overrides:

computeSelfCost in class Rel

implement

public Object implement(Implementor implementor,
                        int ordinal)

Description copied from class: Rel

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

Overrides:

implement in class Rel

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.