Package org.apache.calcite.adapter.pig

Class PigJoin

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.BiRel

org.apache.calcite.rel.core.Join

org.apache.calcite.adapter.pig.PigJoin

All Implemented Interfaces:

java.lang.Cloneable, PigRel, RelOptNode, RelNode

public class PigJoin
extends Join
implements PigRel

Implementation of Join in Pig calling convention.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.calcite.adapter.pig.PigRel

PigRel.Implementor

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

RelNode.Context

Field Summary

Fields inherited from class org.apache.calcite.rel.core.Join

condition, joinType, variablesSet

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

left, right

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

digest, id, rowType, traitSet

Fields inherited from interface org.apache.calcite.adapter.pig.PigRel

CONVENTION

Constructor Summary

Constructors

Constructor	Description
PigJoin(RelOptCluster cluster, RelTraitSet traitSet, RelNode left, RelNode right, RexNode condition, JoinRelType joinType)	Creates a PigJoin.

Method Summary

Modifier and Type	Method	Description
Join	copy(RelTraitSet traitSet, RexNode conditionExpr, RelNode left, RelNode right, JoinRelType joinType, boolean semiJoinDone)	Creates a copy of this join, overriding condition, system fields and inputs.
private java.lang.String	getPigJoinStatement(PigRel.Implementor implementor)	Constructs a Pig JOIN statement in the form of
private java.lang.String	getPigJoinType()	Get a string representation of the type of join for use in a Pig script.
RelOptTable	getTable()	The Pig alias of the joined relation will have the same name as one from the left side of the join.
void	implement(PigRel.Implementor implementor)	Converts this node to a Pig Latin statement.

Methods inherited from class org.apache.calcite.rel.core.Join

accept, analyzeCondition, computeSelfCost, copy, createJoinType, deriveJoinRowType, deriveRowType, estimateJoinedRows, estimateRowCount, explainTerms, getChildExps, getCondition, getJoinType, getSystemFieldList, getVariablesSet, isSemiJoinDone, isValid

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

childrenAccept, getInputs, getLeft, getRight, replaceInput

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

accept, collectVariablesSet, collectVariablesUsed, computeDigest, computeSelfCost, explain, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getQuery, getRelTypeName, getRows, getRowType, getTraitSet, getVariablesStopped, isDistinct, isKey, 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, copy, estimateRowCount, explain, getChildExps, getCollationList, getConvention, getCorrelVariable, getExpectedInputRowType, getInput, getInputs, getQuery, getRelTypeName, getRows, getRowType, 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

Constructor Detail

PigJoin

public PigJoin(RelOptCluster cluster,
               RelTraitSet traitSet,
               RelNode left,
               RelNode right,
               RexNode condition,
               JoinRelType joinType)

Creates a PigJoin.

Method Detail

copy

public Join copy(RelTraitSet traitSet,
                 RexNode conditionExpr,
                 RelNode left,
                 RelNode right,
                 JoinRelType joinType,
                 boolean semiJoinDone)

Description copied from class: Join

Creates a copy of this join, overriding condition, system fields and inputs.

General contract as RelNode.copy(org.apache.calcite.plan.RelTraitSet, java.util.List<org.apache.calcite.rel.RelNode>).

Specified by:

copy in class Join

Parameters:

traitSet - Traits

conditionExpr - Condition

left - Left input

right - Right input

joinType - Join type

semiJoinDone - Whether this join has been translated to a semi-join

Returns:

Copy of this join

implement

public void implement(PigRel.Implementor implementor)

Description copied from interface: PigRel

Converts this node to a Pig Latin statement.

Specified by:

implement in interface PigRel

getTable

public RelOptTable getTable()

The Pig alias of the joined relation will have the same name as one from the left side of the join.

Specified by:

getTable in interface RelNode

Overrides:

getTable in class AbstractRelNode

Returns:

If this relational expression represents an access to a table, returns that table, otherwise returns null

getPigJoinStatement

private java.lang.String getPigJoinStatement(PigRel.Implementor implementor)

Constructs a Pig JOIN statement in the form of

 
 A = JOIN A BY f1 LEFT OUTER, B BY f2;
 
 

Only supports simple equi-joins with single column on both sides of =.

getPigJoinType

private java.lang.String getPigJoinType()

Get a string representation of the type of join for use in a Pig script. Pig does not have an explicit "inner" marker, so return an empty string in this case.