org.apache.calcite.adapter.pig

Class PigToEnumerableConverter

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.SingleRel

org.apache.calcite.rel.convert.ConverterImpl

org.apache.calcite.adapter.pig.PigToEnumerableConverter

All Implemented Interfaces:

java.lang.Cloneable, EnumerableRel, RelOptNode, Converter, RelNode

public class PigToEnumerableConverter
extends ConverterImpl
implements EnumerableRel

Relational expression representing a scan of a table in a Pig data source.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.calcite.adapter.enumerable.EnumerableRel

EnumerableRel.Prefer, EnumerableRel.Result

Nested classes/interfaces inherited from interface org.apache.calcite.rel.RelNode

RelNode.Context

Field Summary

Fields inherited from class org.apache.calcite.rel.convert.ConverterImpl

inTraits, traitDef

Fields inherited from class org.apache.calcite.rel.SingleRel

input

Fields inherited from class org.apache.calcite.rel.AbstractRelNode

digest, id, rowType, traitSet

Fields inherited from interface org.apache.calcite.adapter.enumerable.EnumerableRel

FILTER_FACTORY, PROJECT_FACTORY

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	PigToEnumerableConverter(RelOptCluster cluster, RelTraitSet traits, RelNode input) Creates a PigToEnumerableConverter.

Method Summary

Modifier and Type	Method and Description
RelNode	copy(RelTraitSet traitSet, java.util.List<RelNode> inputs)
EnumerableRel.Result	implement(EnumerableRelImplementor implementor, EnumerableRel.Prefer pref)

Methods inherited from class org.apache.calcite.rel.convert.ConverterImpl

cannotImplement, computeSelfCost, getInputTraits, getTraitDef

Methods inherited from class org.apache.calcite.rel.SingleRel

childrenAccept, deriveRowType, estimateRowCount, explainTerms, getInput, getInputs, replaceInput

Methods inherited from class org.apache.calcite.rel.AbstractRelNode

accept, accept, collectVariablesSet, collectVariablesUsed, computeDigest, computeSelfCost, explain, getChildExps, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getQuery, getRelTypeName, getRows, getRowType, getTable, getTraitSet, getVariablesSet, getVariablesStopped, isDistinct, isKey, isValid, isValid, metadata, onRegister, recomputeDigest, register, sole, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.calcite.rel.RelNode

accept, accept, childrenAccept, collectVariablesSet, collectVariablesUsed, computeSelfCost, computeSelfCost, estimateRowCount, explain, getChildExps, getCollationList, getConvention, getCorrelVariable, getExpectedInputRowType, getInput, getInputs, getQuery, getRelTypeName, getRows, getRowType, getTable, getVariablesSet, getVariablesStopped, isDistinct, isKey, isValid, isValid, metadata, onRegister, recomputeDigest, register, replaceInput

Methods inherited from interface org.apache.calcite.plan.RelOptNode

getCluster, getDescription, getDigest, getId, getTraitSet

Methods inherited from interface org.apache.calcite.rel.convert.Converter

getInput

Constructor Detail

PigToEnumerableConverter

protected PigToEnumerableConverter(RelOptCluster cluster,
                                   RelTraitSet traits,
                                   RelNode input)

Creates a PigToEnumerableConverter.

Method Detail

copy

public RelNode copy(RelTraitSet traitSet,
                    java.util.List<RelNode> inputs)

Specified by:

copy in interface RelNode

Overrides:

copy in class AbstractRelNode

implement

public EnumerableRel.Result implement(EnumerableRelImplementor implementor,
                                      EnumerableRel.Prefer pref)

This implementation does not actually execute the associated Pig Latin script and return results. Instead it returns an empty EnumerableRel.Result in order to allow for testing and verification of every step of query processing up to actual physical execution and result verification.

Next step is to invoke Pig from here, likely in local mode, have it store results in a predefined file so they can be read here and returned as a Result object.

Specified by:

implement in interface EnumerableRel