org.apache.beam.sdk.extensions.sql.impl.rel

Class BeamUnionRel

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.calcite.rel.core.SetOp

org.apache.calcite.rel.core.Union

org.apache.beam.sdk.extensions.sql.impl.rel.BeamUnionRel

All Implemented Interfaces:

java.lang.Cloneable, BeamRelNode, org.apache.calcite.plan.RelOptNode, org.apache.calcite.rel.RelNode

public class BeamUnionRel
extends org.apache.calcite.rel.core.Union
implements BeamRelNode

BeamRelNode to replace a Union.

BeamUnionRel needs the input of it have the same WindowFn. From the SQL perspective, two cases are supported:

1) Do not use grouped window function:

 select * from person UNION select * from person
 

2) Use the same grouped window function, with the same param:

 select id, count(*) from person
 group by id, TUMBLE(order_time, INTERVAL '1' HOUR)
 UNION
 select * from person
 group by id, TUMBLE(order_time, INTERVAL '1' HOUR)
 

Inputs with different group functions are NOT supported:

 select id, count(*) from person
 group by id, TUMBLE(order_time, INTERVAL '1' HOUR)
 UNION
 select * from person
 group by id, TUMBLE(order_time, INTERVAL '2' HOUR)
 

Nested Class Summary

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

org.apache.calcite.rel.RelNode.Context

Field Summary

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

all, inputs, kind

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

digest, id, rowType, traitSet

Constructor Summary

Constructors

Constructor and Description
BeamUnionRel(org.apache.calcite.plan.RelOptCluster cluster, org.apache.calcite.plan.RelTraitSet traits, java.util.List<org.apache.calcite.rel.RelNode> inputs, boolean all)

Method Summary

Modifier and Type	Method and Description
org.apache.calcite.rel.core.SetOp	copy(org.apache.calcite.plan.RelTraitSet traitSet, java.util.List<org.apache.calcite.rel.RelNode> inputs, boolean all)
PTransform<PCollectionTuple,PCollection<Row>>	toPTransform() A BeamRelNode is a recursive structure, the BeamQueryPlanner visits it with a DFS(Depth-First-Search) algorithm.

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

estimateRowCount, estimateRowCount

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

copy, deriveRowType, explainTerms, getInputs, isHomogeneous, replaceInput

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

accept, accept, childrenAccept, collectVariablesSet, collectVariablesUsed, computeDigest, computeSelfCost, 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

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, 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

Constructor Detail

BeamUnionRel

public BeamUnionRel(org.apache.calcite.plan.RelOptCluster cluster,
                    org.apache.calcite.plan.RelTraitSet traits,
                    java.util.List<org.apache.calcite.rel.RelNode> inputs,
                    boolean all)

Method Detail

copy

public org.apache.calcite.rel.core.SetOp copy(org.apache.calcite.plan.RelTraitSet traitSet,
                                              java.util.List<org.apache.calcite.rel.RelNode> inputs,
                                              boolean all)

Specified by:

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

toPTransform

public PTransform<PCollectionTuple,PCollection<Row>> toPTransform()

Description copied from interface: BeamRelNode

A BeamRelNode is a recursive structure, the BeamQueryPlanner visits it with a DFS(Depth-First-Search) algorithm.

Specified by:

toPTransform in interface BeamRelNode