net.sf.saffron.oj.rel
Class IterCalcRel

java.lang.Object
  |
  +--net.sf.saffron.rel.SaffronRel
        |
        +--net.sf.saffron.rel.SingleRel
              |
              +--net.sf.saffron.rel.ProjectRelBase
                    |
                    +--net.sf.saffron.oj.rel.IterCalcRel

public class IterCalcRel

extends ProjectRelBase

IterCalcRel is an iterator implementation of a combination of ProjectRel above an optional FilterRel. It takes an iterator as input, and for each row applies the filter condition if defined. Rows passing the filter expression are transformed via projection and returned. Note that the same object is always returned (with different values), so parents must not buffer the result.

Nested Class Summary

Nested classes inherited from class net.sf.saffron.rel.ProjectRelBase

ProjectRelBase.Flags

Field Summary

private RexNode[]	childExps
RexNode	condition

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

exps, fieldNames, flags

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

IterCalcRel(VolcanoCluster cluster, SaffronRel child, RexNode[] exps, RexNode condition, String[] fieldNames, int flags)

Method Summary

Object	clone()
void	explain(PlanWriter pw)
RexNode[]	getChildExps() Returns an array of this SaffronRel's child expressions (not including the inputs returned by SingleRel.getInputs().
CallingConvention	getConvention() Returns a value from CallingConvention.
Object	implement(RelImplementor implementor, int ordinal) Create a plan for this expression according to a calling convention.

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

computeSelfCost, defineTerms, deriveRowType, getFieldNames, getFlags, implementFieldAccess, isBoxed

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

childrenAccept, getInputs, getRows, replaceInput

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

computeDigest, getCluster, getCorrelVariable, getId, getInput, getOrCreateCorrelVariable, getQualifier, getQuery, getRelTypeName, getRowType, getTable, getVariablesStopped, isAccessTo, isDistinct, onRegister, recomputeDigest, register, registerCorrelVariable, setCorrelVariable, toString

Methods inherited from class java.lang.Object

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

Field Detail

condition

public final RexNode condition

childExps

private RexNode[] childExps

Constructor Detail

IterCalcRel

public IterCalcRel(VolcanoCluster cluster,
                   SaffronRel child,
                   RexNode[] exps,
                   RexNode condition,
                   String[] fieldNames,
                   int flags)

Method Detail

getChildExps

public RexNode[] getChildExps()

Description copied from class: SaffronRel

Returns an array of this SaffronRel's child expressions (not including the inputs returned by SaffronRel.getInputs(). If there are no child expressions, returns an empty array, not null.

Overrides:

getChildExps in class ProjectRelBase

explain

public void explain(PlanWriter pw)

Overrides:

explain in class ProjectRelBase

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

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 SaffronRel

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.