Package org.apache.calcite.adapter.pig
Class PigToEnumerableConverter
- java.lang.Object
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- org.apache.calcite.rel.AbstractRelNode
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- org.apache.calcite.rel.SingleRel
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- org.apache.calcite.rel.convert.ConverterImpl
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- org.apache.calcite.adapter.pig.PigToEnumerableConverter
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- 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.
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Nested Class Summary
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Nested classes/interfaces inherited from interface org.apache.calcite.adapter.enumerable.EnumerableRel
EnumerableRel.Prefer, EnumerableRel.Result
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Nested classes/interfaces inherited from interface org.apache.calcite.rel.RelNode
RelNode.Context
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Field Summary
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Fields inherited from class org.apache.calcite.rel.convert.ConverterImpl
inTraits, traitDef
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Fields inherited from class org.apache.calcite.rel.AbstractRelNode
digest, id, rowType, traitSet
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Fields inherited from interface org.apache.calcite.adapter.enumerable.EnumerableRel
FILTER_FACTORY, PROJECT_FACTORY
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Constructor Summary
Constructors Modifier Constructor Description protected
PigToEnumerableConverter(RelOptCluster cluster, RelTraitSet traits, RelNode input)
Creates a PigToEnumerableConverter.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description RelNode
copy(RelTraitSet traitSet, java.util.List<RelNode> inputs)
Creates a copy of this relational expression, perhaps changing traits and inputs.EnumerableRel.Result
implement(EnumerableRelImplementor implementor, EnumerableRel.Prefer pref)
Creates a plan for this expression according to a calling convention.-
Methods inherited from class org.apache.calcite.rel.convert.ConverterImpl
cannotImplement, computeSelfCost, getInputTraits, getTraitDef
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Methods inherited from class org.apache.calcite.rel.SingleRel
childrenAccept, deriveRowType, estimateRowCount, explainTerms, getInput, getInputs, replaceInput
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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
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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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
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Methods inherited from interface org.apache.calcite.plan.RelOptNode
getCluster, getDescription, getDigest, getId, getTraitSet
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Constructor Detail
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PigToEnumerableConverter
protected PigToEnumerableConverter(RelOptCluster cluster, RelTraitSet traits, RelNode input)
Creates a PigToEnumerableConverter.
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Method Detail
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copy
public RelNode copy(RelTraitSet traitSet, java.util.List<RelNode> inputs)
Description copied from interface:RelNode
Creates a copy of this relational expression, perhaps changing traits and inputs.Sub-classes with other important attributes are encouraged to create variants of this method with more parameters.
- Specified by:
copy
in interfaceRelNode
- Overrides:
copy
in classAbstractRelNode
- Parameters:
traitSet
- Trait setinputs
- Inputs- Returns:
- Copy of this relational expression, substituting traits and inputs
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implement
public EnumerableRel.Result implement(EnumerableRelImplementor implementor, EnumerableRel.Prefer pref)
Creates a plan for this expression according to a calling convention.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 interfaceEnumerableRel
- Parameters:
implementor
- Implementorpref
- Preferred representation for rows in result expression- Returns:
- Plan for this expression according to a calling convention
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