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 ith 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)

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