Package org.apache.calcite.adapter.pig

Class PigFilter

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.SingleRel

org.apache.calcite.rel.core.Filter

org.apache.calcite.adapter.pig.PigFilter

All Implemented Interfaces:

java.lang.Cloneable, PigRel, RelOptNode, RelNode

public class PigFilter
extends Filter
implements PigRel

Implementation of Filter 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.Filter

condition

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.pig.PigRel

CONVENTION

Constructor Summary

Constructors

Constructor	Description
PigFilter(RelOptCluster cluster, RelTraitSet traitSet, RelNode input, RexNode condition)	Creates a PigFilter.

Method Summary

Modifier and Type	Method	Description
private boolean	containsOnlyConjunctions(RexNode condition)
Filter	copy(RelTraitSet traitSet, RelNode input, RexNode condition)
private java.lang.String	getLiteralAsString(RexLiteral literal)	TODO: do proper literal to string conversion + escaping
private java.lang.String	getPigFilterStatement(PigRel.Implementor implementor)	Generates Pig Latin filtering statements, for example
private java.lang.String	getSingleFilterCondition(PigRel.Implementor implementor, java.lang.String op, RexCall call)
private java.lang.String	getSingleFilterCondition(PigRel.Implementor implementor, RexNode node)
RelOptTable	getTable()	Override this method so it looks down the tree to find the table this node is acting on.
void	implement(PigRel.Implementor implementor)	Converts this node to a Pig Latin statement.

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

accept, computeSelfCost, copy, estimateFilteredRows, estimateFilteredRows, estimateRowCount, explainTerms, getChildExps, getCondition, isValid

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

childrenAccept, deriveRowType, getInput, getInputs, 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, getVariablesSet, 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

PigFilter

public PigFilter(RelOptCluster cluster,
                 RelTraitSet traitSet,
                 RelNode input,
                 RexNode condition)

Creates a PigFilter.

Method Detail

copy

public Filter copy(RelTraitSet traitSet,
                   RelNode input,
                   RexNode condition)

Specified by:

copy in class Filter

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()

Override this method so it looks down the tree to find the table this node is acting on.

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

getPigFilterStatement

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

Generates Pig Latin filtering statements, for example

table = FILTER table BY score > 2.0;

getSingleFilterCondition

private java.lang.String getSingleFilterCondition(PigRel.Implementor implementor,
                                                  RexNode node)

getSingleFilterCondition

private java.lang.String getSingleFilterCondition(PigRel.Implementor implementor,
                                                  java.lang.String op,
                                                  RexCall call)

containsOnlyConjunctions

private boolean containsOnlyConjunctions(RexNode condition)

getLiteralAsString

private java.lang.String getLiteralAsString(RexLiteral literal)

TODO: do proper literal to string conversion + escaping