net.sf.farrago.namespace.jdbc
Class ResultSetToFarragoIteratorConverter

java.lang.Object
  extended by org.eigenbase.rel.AbstractRelNode
      extended by org.eigenbase.rel.SingleRel
          extended by org.eigenbase.rel.convert.ConverterRelImpl
              extended by net.sf.farrago.namespace.jdbc.ResultSetToFarragoIteratorConverter
All Implemented Interfaces:
Cloneable, JavaRel, ConverterRel, RelNode

 class ResultSetToFarragoIteratorConverter
extends ConverterRelImpl
implements ConverterRel, JavaRel

ResultSetToFarragoIteratorConverter is a ConverterRel from the RESULT_SET CallingConvention to the ITERATOR CallingConvention which ensures that the objects returned by the iterator are understood by the rest of Farrago.

Version:
$Id: //open/dev/farrago/src/net/sf/farrago/namespace/jdbc/ResultSetToFarragoIteratorConverter.java#29 $
Author:
John V. Sichi

Field Summary
 
Fields inherited from class org.eigenbase.rel.convert.ConverterRelImpl
inTraits, traitDef
 
Fields inherited from class org.eigenbase.rel.AbstractRelNode
digest, id, rowType, traits
 
Fields inherited from interface org.eigenbase.rel.RelNode
emptyArray
 
Fields inherited from interface org.eigenbase.rel.RelNode
emptyArray
 
Constructor Summary
ResultSetToFarragoIteratorConverter(RelOptCluster cluster, RelNode child)
          Creates a new ResultSetToFarragoIteratorConverter object.
 
Method Summary
 ResultSetToFarragoIteratorConverter clone()
          Clones this RelNode.
 ParseTree implement(JavaRelImplementor implementor)
          Creates a plan for this expression according to a calling convention.
 
Methods inherited from class org.eigenbase.rel.convert.ConverterRelImpl
cannotImplement, computeSelfCost, convertTraits, getInputConvention, getInputTraits, getTraitDef, isDistinct
 
Methods inherited from class org.eigenbase.rel.SingleRel
childrenAccept, deriveRowType, explain, getChild, getInputs, getRows, replaceInput
 
Methods inherited from class org.eigenbase.rel.AbstractRelNode
cloneTraits, collectVariablesSet, collectVariablesUsed, computeDigest, getChildExps, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getOrCreateCorrelVariable, getQuery, getRelTypeName, getRowType, getTable, getTraits, getVariablesStopped, inheritTraitsFrom, isAccessTo, isValid, onRegister, recomputeDigest, register, registerCorrelVariable, setCorrelVariable, toString
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface org.eigenbase.rel.convert.ConverterRel
getChild, getInputTraits, getTraitDef
 
Methods inherited from interface org.eigenbase.rel.RelNode
childrenAccept, collectVariablesSet, collectVariablesUsed, computeSelfCost, explain, getChildExps, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getInputs, getOrCreateCorrelVariable, getQuery, getRelTypeName, getRows, getRowType, getTable, getTraits, getVariablesStopped, isAccessTo, isDistinct, isValid, onRegister, recomputeDigest, registerCorrelVariable, replaceInput, setCorrelVariable
 
Methods inherited from interface org.eigenbase.rel.RelNode
childrenAccept, collectVariablesSet, collectVariablesUsed, computeSelfCost, explain, getChildExps, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getInputs, getOrCreateCorrelVariable, getQuery, getRelTypeName, getRows, getRowType, getTable, getTraits, getVariablesStopped, isAccessTo, isDistinct, isValid, onRegister, recomputeDigest, registerCorrelVariable, replaceInput, setCorrelVariable
 

Constructor Detail

ResultSetToFarragoIteratorConverter

public ResultSetToFarragoIteratorConverter(RelOptCluster cluster,
                                           RelNode child)
Creates a new ResultSetToFarragoIteratorConverter object.

Parameters:
cluster - RelOptCluster for this rel
child - input rel producing rows in ResultSet representation
Method Detail

clone

public ResultSetToFarragoIteratorConverter clone()
Description copied from interface: RelNode
Clones this RelNode.

Traits of the RelNode must be explicitly cloned, using AbstractRelNode.inheritTraitsFrom(AbstractRelNode), as the RelNode may have traits of which it has no knowledge. Example implementation:

     public MyRelNode clone()
     {
         MyRelNode clone = new MyRelNode(...);
         clone.inheritTraitsFrom(this);
         return clone;
     }
 
N.B.: This method must be overridden whenever an existing, concrete RelNode is extended. Otherwise, calling clone() will produce a differently typed RelNode, resulting in invalid or incorrect query plans.

Specified by:
clone in interface RelNode
Specified by:
clone in class AbstractRelNode
Returns:
a clone of this RelNode

implement

public ParseTree implement(JavaRelImplementor implementor)
Description copied from interface: JavaRel
Creates a plan for this expression according to a calling convention.

Specified by:
implement in interface JavaRel
Parameters:
implementor - implementor