net.sf.farrago.namespace.jdbc
Class ResultSetToFarragoIteratorConverter

java.lang.Object
  org.eigenbase.rel.AbstractRelNode
      org.eigenbase.rel.SingleRel
          org.eigenbase.rel.convert.ConverterRelImpl
              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