net.sf.saffron.oj.convert
Class ExistsConverterRel

java.lang.Object
  |
  +--net.sf.saffron.rel.SaffronRel
        |
        +--net.sf.saffron.rel.SingleRel
              |
              +--net.sf.saffron.rel.convert.ConverterRel
                    |
                    +--net.sf.saffron.oj.convert.ExistsConverterRel

public class ExistsConverterRel

extends ConverterRel

An ExistsConverterRel converts a relational expression node (SaffronRel) to CallingConvention.EXISTS_ORDINAL calling convention: an expression which yields true if the relation returns at least one row.

Field Summary

Fields inherited from class net.sf.saffron.rel.convert.ConverterRel

inConvention

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

child

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

cluster, digest, id, rowType

Constructor Summary

ExistsConverterRel(VolcanoCluster cluster, SaffronRel child)

Method Summary

Object	clone()
CallingConvention	getConvention() Returns a value from CallingConvention.
Object	implement(RelImplementor implementor, int ordinal) Create a plan for this expression according to a calling convention.
private Object	implementArray(RelImplementor implementor, int ordinal)
private Object	implementCollection(RelImplementor implementor, int ordinal)
private Object	implementEnumeration(RelImplementor implementor, int ordinal)
private Object	implementHashtable(RelImplementor implementor, int ordinal)
private Object	implementIterator(RelImplementor implementor, int ordinal)
private Object	implementJava(RelImplementor implementor, int ordinal)
private Object	implementMap(RelImplementor implementor, int ordinal)
static void	init(SaffronPlanner planner)

Methods inherited from class net.sf.saffron.rel.convert.ConverterRel

computeSelfCost

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

childrenAccept, deriveRowType, explain, getInputs, getRows, replaceInput

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

computeDigest, getChildExps, getCluster, getCorrelVariable, getId, getInput, getOrCreateCorrelVariable, getQualifier, getQuery, getRelTypeName, getRowType, getTable, getVariablesStopped, 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

ExistsConverterRel

public ExistsConverterRel(VolcanoCluster cluster,
                          SaffronRel child)

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()

Specified by:

clone in class SaffronRel

init

public static void init(SaffronPlanner planner)

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 ConverterRel

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.

implementArray

private Object implementArray(RelImplementor implementor,
                              int ordinal)

implementCollection

private Object implementCollection(RelImplementor implementor,
                                   int ordinal)

implementEnumeration

private Object implementEnumeration(RelImplementor implementor,
                                    int ordinal)

implementHashtable

private Object implementHashtable(RelImplementor implementor,
                                  int ordinal)

implementIterator

private Object implementIterator(RelImplementor implementor,
                                 int ordinal)

implementJava

private Object implementJava(RelImplementor implementor,
                             int ordinal)

implementMap

private Object implementMap(RelImplementor implementor,
                            int ordinal)