Package org.apache.iotdb.db.mpp.plan.planner.plan.node.process

Class GroupByLevelNode

java.lang.Object

org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNode

org.apache.iotdb.db.mpp.plan.planner.plan.node.process.ProcessNode

org.apache.iotdb.db.mpp.plan.planner.plan.node.process.MultiChildNode

org.apache.iotdb.db.mpp.plan.planner.plan.node.process.GroupByLevelNode

All Implemented Interfaces:

org.apache.iotdb.consensus.common.request.IConsensusRequest

public class GroupByLevelNode
extends MultiChildNode

This node is responsible for the final aggregation merge operation. It will process the data from TsBlock row by row. For one row, it will rollup the fields which have the same aggregate function and belong to one bucket. Here, that two columns belong to one bucket means the partial paths of device after rolling up in specific level are the same.

For example, let's say there are two columns `root.sg.d1.s1` and `root.sg.d2.s1`.

If the group by level parameter is [0, 1], then these two columns will belong to one bucket and the bucket name is `root.sg.*.s1`.

If the group by level parameter is [0, 2], then these two columns will not belong to one bucket. And the total buckets are `root.*.d1.s1` and `root.*.d2.s1`

Field Summary

Fields

Modifier and Type	Field	Description
protected java.util.List<GroupByLevelDescriptor>	groupByLevelDescriptors
protected GroupByTimeParameter	groupByTimeParameter
protected Ordering	scanOrder

Fields inherited from class org.apache.iotdb.db.mpp.plan.planner.plan.node.process.MultiChildNode

children

Fields inherited from class org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNode

CHILD_COUNT_NO_LIMIT, NO_CHILD_ALLOWED, ONE_CHILD

Constructor Summary

Constructors

Constructor	Description
GroupByLevelNode(PlanNodeId id, java.util.List<PlanNode> children, java.util.List<GroupByLevelDescriptor> groupByLevelDescriptors, GroupByTimeParameter groupByTimeParameter, Ordering scanOrder)
GroupByLevelNode(PlanNodeId id, java.util.List<GroupByLevelDescriptor> groupByLevelDescriptors, GroupByTimeParameter groupByTimeParameter, Ordering scanOrder)

Method Summary

Modifier and Type	Method	Description
<R,C> R	accept(PlanVisitor<R,C> visitor, C context)
void	addChild(PlanNode child)
int	allowedChildCount()
PlanNode	clone()
static GroupByLevelNode	deserialize(java.nio.ByteBuffer byteBuffer)
boolean	equals(java.lang.Object o)
java.util.List<PlanNode>	getChildren()
java.util.List<GroupByLevelDescriptor>	getGroupByLevelDescriptors()
GroupByTimeParameter	getGroupByTimeParameter()
java.util.List<java.lang.String>	getOutputColumnNames()
Ordering	getScanOrder()
int	hashCode()
protected void	serializeAttributes(java.io.DataOutputStream stream)
protected void	serializeAttributes(java.nio.ByteBuffer byteBuffer)
void	setGroupByLevelDescriptors(java.util.List<GroupByLevelDescriptor> groupByLevelDescriptors)
java.lang.String	toString()

Methods inherited from class org.apache.iotdb.db.mpp.plan.planner.plan.node.process.MultiChildNode

setChildren

Methods inherited from class org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNode

cloneWithChildren, getPlanNodeId, serialize, serialize, serializeToByteBuffer, setPlanNodeId

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

groupByLevelDescriptors

protected java.util.List<GroupByLevelDescriptor> groupByLevelDescriptors

groupByTimeParameter

@Nullable
protected GroupByTimeParameter groupByTimeParameter

scanOrder

protected Ordering scanOrder

Constructor Detail

GroupByLevelNode

public GroupByLevelNode(PlanNodeId id,
                        java.util.List<PlanNode> children,
                        java.util.List<GroupByLevelDescriptor> groupByLevelDescriptors,
                        GroupByTimeParameter groupByTimeParameter,
                        Ordering scanOrder)

GroupByLevelNode

public GroupByLevelNode(PlanNodeId id,
                        java.util.List<GroupByLevelDescriptor> groupByLevelDescriptors,
                        GroupByTimeParameter groupByTimeParameter,
                        Ordering scanOrder)

Method Detail

getChildren

public java.util.List<PlanNode> getChildren()

Specified by:

getChildren in class PlanNode

addChild

public void addChild(PlanNode child)

Specified by:

addChild in class PlanNode

allowedChildCount

public int allowedChildCount()

Specified by:

allowedChildCount in class PlanNode

clone

public PlanNode clone()

Specified by:

clone in class PlanNode

getGroupByLevelDescriptors

public java.util.List<GroupByLevelDescriptor> getGroupByLevelDescriptors()

setGroupByLevelDescriptors

public void setGroupByLevelDescriptors(java.util.List<GroupByLevelDescriptor> groupByLevelDescriptors)

getOutputColumnNames

public java.util.List<java.lang.String> getOutputColumnNames()

Specified by:

getOutputColumnNames in class PlanNode

accept

public <R,C> R accept(PlanVisitor<R,C> visitor,
                            C context)

Overrides:

accept in class PlanNode

serializeAttributes

protected void serializeAttributes(java.nio.ByteBuffer byteBuffer)

Specified by:

serializeAttributes in class PlanNode

serializeAttributes

protected void serializeAttributes(java.io.DataOutputStream stream)
                            throws java.io.IOException

Specified by:

serializeAttributes in class PlanNode

Throws:

java.io.IOException

deserialize

public static GroupByLevelNode deserialize(java.nio.ByteBuffer byteBuffer)

getGroupByTimeParameter

@Nullable
public GroupByTimeParameter getGroupByTimeParameter()

getScanOrder

public Ordering getScanOrder()

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class MultiChildNode

hashCode

public int hashCode()

Overrides:

hashCode in class MultiChildNode

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object