org.apache.drill.exec.planner.physical

Class ProjectPrel

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.SingleRel

org.apache.calcite.rel.core.Project

org.apache.drill.exec.planner.common.DrillProjectRelBase

org.apache.drill.exec.planner.physical.ProjectPrel

All Implemented Interfaces:

Cloneable, Iterable<Prel>, org.apache.calcite.plan.RelOptNode, org.apache.calcite.rel.RelNode, DrillRelNode, Prel

Direct Known Subclasses:

ProjectAllowDupPrel

public class ProjectPrel
extends DrillProjectRelBase
implements Prel

A physical Prel node for Project operator.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.calcite.rel.core.Project

org.apache.calcite.rel.core.Project.Flags

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

org.apache.calcite.rel.RelNode.Context

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	outputProj

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

exps

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.drill.exec.planner.physical.Prel

DRILL_PHYSICAL

Constructor Summary

Constructors

Constructor and Description
ProjectPrel(org.apache.calcite.plan.RelOptCluster cluster, org.apache.calcite.plan.RelTraitSet traits, org.apache.calcite.rel.RelNode child, List<org.apache.calcite.rex.RexNode> exps, org.apache.calcite.rel.type.RelDataType rowType)
ProjectPrel(org.apache.calcite.plan.RelOptCluster cluster, org.apache.calcite.plan.RelTraitSet traits, org.apache.calcite.rel.RelNode child, List<org.apache.calcite.rex.RexNode> exps, org.apache.calcite.rel.type.RelDataType rowType, boolean outputProj) Constructor for ProjectPrel.

Method Summary

Modifier and Type	Method and Description
<T,X,E extends Throwable> T	accept(PrelVisitor<T,X,E> logicalVisitor, X value)
org.apache.calcite.rel.core.Project	copy(org.apache.calcite.plan.RelTraitSet traitSet, org.apache.calcite.rel.RelNode input, List<org.apache.calcite.rex.RexNode> exps, org.apache.calcite.rel.type.RelDataType rowType)
BatchSchema.SelectionVectorMode	getEncoding() A Prel's own SelectionVector mode - i.e whether it generates an SV2, SV4 or None
PhysicalOperator	getPhysicalOperator(PhysicalPlanCreator creator)
BatchSchema.SelectionVectorMode[]	getSupportedEncodings() Supported 'encodings' of a Prel indicates what are the acceptable modes of SelectionVector of its child Prel
Iterator<Prel>	iterator()
boolean	needsFinalColumnReordering() Whether this Project requires a final column re-ordering.
Prel	prepareForLateralUnnestPipeline(List<org.apache.calcite.rel.RelNode> children) If the operator is in Lateral/Unnest pipeline, then it generates a new operator which knows how to process the rows accordingly during execution.

Methods inherited from class org.apache.drill.exec.planner.common.DrillProjectRelBase

computeSelfCost, getProjectExpressions

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

accept, copy, copy, explainTerms, getChildExps, getFlags, getMapping, getMapping, getNamedProjects, getPartialMapping, getPermutation, getPermutation, getProjects, isBoxed, isMapping, isValid

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

childrenAccept, deriveRowType, estimateRowCount, getInput, getInputs, replaceInput

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

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

Methods inherited from class java.lang.Object

clone, finalize, getClass, 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, 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 java.lang.Iterable

forEach, spliterator

Field Detail

outputProj

protected final boolean outputProj

Constructor Detail

ProjectPrel

public ProjectPrel(org.apache.calcite.plan.RelOptCluster cluster,
                   org.apache.calcite.plan.RelTraitSet traits,
                   org.apache.calcite.rel.RelNode child,
                   List<org.apache.calcite.rex.RexNode> exps,
                   org.apache.calcite.rel.type.RelDataType rowType)

ProjectPrel

public ProjectPrel(org.apache.calcite.plan.RelOptCluster cluster,
                   org.apache.calcite.plan.RelTraitSet traits,
                   org.apache.calcite.rel.RelNode child,
                   List<org.apache.calcite.rex.RexNode> exps,
                   org.apache.calcite.rel.type.RelDataType rowType,
                   boolean outputProj)

Constructor for ProjectPrel.

Parameters:

cluster -

traits - traits of ProjectPrel node

child - input

exps - list of RexNode, representing expressions of projection.

rowType - output rowType of projection expression.

outputProj - true if ProjectPrel is inserted by TopProjectVisitor Such top Project operator does the following processing, before the result was presented to Screen/Writer

1. ensure final output field names are preserved
2. handle cases where input does not return any batch (a fast NONE) (see ProjectRecordBatch.handleNullInput() method)
3. handle cases where expressions in upstream operator were evaluated to NULL type
(Null type will be converted into Nullable-INT)

false otherwise.

Method Detail

copy

public org.apache.calcite.rel.core.Project copy(org.apache.calcite.plan.RelTraitSet traitSet,
                                                org.apache.calcite.rel.RelNode input,
                                                List<org.apache.calcite.rex.RexNode> exps,
                                                org.apache.calcite.rel.type.RelDataType rowType)

Specified by:

copy in class org.apache.calcite.rel.core.Project

getPhysicalOperator

public PhysicalOperator getPhysicalOperator(PhysicalPlanCreator creator)
                                     throws IOException

Specified by:

getPhysicalOperator in interface Prel

Throws:

IOException

iterator

public Iterator<Prel> iterator()

Specified by:

iterator in interface Iterable<Prel>

accept

public <T,X,E extends Throwable> T accept(PrelVisitor<T,X,E> logicalVisitor,
                                          X value)
                                   throws E extends Throwable

Specified by:

accept in interface Prel

Throws:

E extends Throwable

getSupportedEncodings

public BatchSchema.SelectionVectorMode[] getSupportedEncodings()

Description copied from interface: Prel

Supported 'encodings' of a Prel indicates what are the acceptable modes of SelectionVector of its child Prel

Specified by:

getSupportedEncodings in interface Prel

getEncoding

public BatchSchema.SelectionVectorMode getEncoding()

Description copied from interface: Prel

A Prel's own SelectionVector mode - i.e whether it generates an SV2, SV4 or None

Specified by:

getEncoding in interface Prel

needsFinalColumnReordering

public boolean needsFinalColumnReordering()

Whether this Project requires a final column re-ordering. Returns False for all cases except when convert_fromjson function is present. For convert_fromjson function, the Project operator at run-time produces an output schema with convert_fromjson expr appended to the end of the schema. We need a final column re-ordering to ensure the correct column order.

Specified by:

needsFinalColumnReordering in interface Prel

prepareForLateralUnnestPipeline

public Prel prepareForLateralUnnestPipeline(List<org.apache.calcite.rel.RelNode> children)

Description copied from interface: Prel

If the operator is in Lateral/Unnest pipeline, then it generates a new operator which knows how to process the rows accordingly during execution. eg: TopNPrel -> SortPrel and LimitPrel Other operators like FilterPrel, ProjectPrel etc will add an implicit row id to the output.

Specified by:

prepareForLateralUnnestPipeline in interface Prel