Package org.apache.calcite.adapter.enumerable

Class EnumerableCombine

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.core.Combine

org.apache.calcite.adapter.enumerable.EnumerableCombine

All Implemented Interfaces:

Cloneable, EnumerableRel, RelOptNode, PhysicalNode, RelNode

public class EnumerableCombine
extends Combine
implements EnumerableRel

Implementation of Combine in enumerable calling convention.

The output format is a wide table where each column corresponds to a query (named QUERY_0, QUERY_1, etc.) and each row contains a struct (map) with that query's column values for that row index. The number of output rows equals the maximum row count across all input queries. Queries with fewer rows have null values for the additional rows.

Example output for two queries:

 QUERY_0                  | QUERY_1
 ------------------------ | ------------------------
 {empno=100, name=Bill}   | {deptno=10, name=Sales}
 {empno=110, name=Eric}   | {deptno=20, name=HR}
 {empno=120, name=Ted}    | null
 

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.core.Combine

inputs

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

digest, id, rowType, traitSet

Constructor Summary

Constructors

Constructor	Description
EnumerableCombine(RelOptCluster cluster, RelTraitSet traitSet, List<RelNode> inputs)

Method Summary

Modifier and Type	Method	Description
EnumerableCombine	copy(RelTraitSet traitSet, 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.core.Combine

computeSelfCost, create, deriveRowType, explainTerms, getInputs, replaceInput

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

accept, accept, childrenAccept, collectVariablesSet, collectVariablesUsed, deepEquals, deepHashCode, equals, estimateRowCount, explain, getCluster, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getRelDigest, getRelTypeName, getRowType, getTable, getTraitSet, getVariablesSet, hashCode, isEnforcer, 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.adapter.enumerable.EnumerableRel

deriveTraits, getDeriveMode, passThroughTraits

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

derive, derive, passThrough

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

accept, accept, childrenAccept, collectVariablesSet, collectVariablesUsed, computeSelfCost, deepEquals, deepHashCode, estimateRowCount, explain, explain, fieldIsNullable, getConvention, getCorrelVariable, getDigest, getExpectedInputRowType, getInput, getInputs, getRelDigest, getRelTypeName, getRowType, getTable, getVariablesSet, isEnforcer, isValid, metadata, onRegister, recomputeDigest, register, replaceInput, stripped

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

getCluster, getDescription, getId, getTraitSet

Constructor Details

EnumerableCombine

public EnumerableCombine(RelOptCluster cluster,
 RelTraitSet traitSet,
 List<RelNode> inputs)

Method Details

copy

public EnumerableCombine copy(RelTraitSet traitSet,
 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 interface RelNode

Overrides:

copy in class Combine

Parameters:

traitSet - Trait set

inputs - Inputs

Returns:

Copy of this relational expression, substituting traits and inputs

implement

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

Description copied from interface: EnumerableRel

Creates a plan for this expression according to a calling convention.

Specified by:

implement in interface EnumerableRel

Parameters:

implementor - Implementor

pref - Preferred representation for rows in result expression

Returns:

Plan for this expression according to a calling convention