Package org.apache.iotdb.db.mpp.plan.execution

Class QueryExecution

java.lang.Object

org.apache.iotdb.db.mpp.plan.execution.QueryExecution

All Implemented Interfaces:

IQueryExecution

public class QueryExecution
extends java.lang.Object
implements IQueryExecution

QueryExecution stores all the status of a query which is being prepared or running inside the MPP frame. It takes three main responsibilities: 1. Prepare a query. Transform a query from statement to DistributedQueryPlan with fragment instances. 2. Dispatch all the fragment instances to corresponding physical nodes. 3. Collect and monitor the progress/states of this query.

Constructor Summary

Constructors

Constructor

Description

QueryExecution(Statement statement, MPPQueryContext context, java.util.concurrent.ExecutorService executor, java.util.concurrent.ExecutorService writeOperationExecutor, java.util.concurrent.ScheduledExecutorService scheduledExecutor, IPartitionFetcher partitionFetcher, ISchemaFetcher schemaFetcher, org.apache.iotdb.commons.client.IClientManager<org.apache.iotdb.common.rpc.thrift.TEndPoint,org.apache.iotdb.commons.client.sync.SyncDataNodeInternalServiceClient> internalServiceClientManager)

Method Summary

Modifier and Type	Method	Description
void	doDistributedPlan()
void	doLogicalPlan()
java.util.Optional<org.apache.iotdb.tsfile.read.common.block.TsBlock>	getBatchResult()	This method will be called by the request thread from client connection.
DatasetHeader	getDatasetHeader()
DistributedQueryPlan	getDistributedPlan()
LogicalQueryPlan	getLogicalPlan()
int	getOutputValueColumnCount()	return the result column count without the time column
java.lang.String	getQueryId()
ExecutionResult	getStatus()	This method is a synchronized method.
boolean	hasNextResult()
boolean	isQuery()
void	start()
void	stop()
void	stopAndCleanup()
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

QueryExecution

public QueryExecution(Statement statement,
                      MPPQueryContext context,
                      java.util.concurrent.ExecutorService executor,
                      java.util.concurrent.ExecutorService writeOperationExecutor,
                      java.util.concurrent.ScheduledExecutorService scheduledExecutor,
                      IPartitionFetcher partitionFetcher,
                      ISchemaFetcher schemaFetcher,
                      org.apache.iotdb.commons.client.IClientManager<org.apache.iotdb.common.rpc.thrift.TEndPoint,org.apache.iotdb.commons.client.sync.SyncDataNodeInternalServiceClient> internalServiceClientManager)

Method Detail

start

public void start()

Specified by:

start in interface IQueryExecution

doLogicalPlan

public void doLogicalPlan()

doDistributedPlan

public void doDistributedPlan()

stop

public void stop()

Specified by:

stop in interface IQueryExecution

stopAndCleanup

public void stopAndCleanup()

Specified by:

stopAndCleanup in interface IQueryExecution

getBatchResult

public java.util.Optional<org.apache.iotdb.tsfile.read.common.block.TsBlock> getBatchResult()
                                                                                     throws org.apache.iotdb.commons.exception.IoTDBException

This method will be called by the request thread from client connection. This method will block until one of these conditions occurs: 1. There is a batch of result 2. There is no more result 3. The query has been cancelled 4. The query is timeout This method will fetch the result from DataStreamManager use the virtual ResultOperator's ID (This part will be designed and implemented with DataStreamManager)

Specified by:

getBatchResult in interface IQueryExecution

Throws:

org.apache.iotdb.commons.exception.IoTDBException

hasNextResult

public boolean hasNextResult()

Specified by:

hasNextResult in interface IQueryExecution

Returns:

true if there is more tsblocks, otherwise false

getOutputValueColumnCount

public int getOutputValueColumnCount()

return the result column count without the time column

Specified by:

getOutputValueColumnCount in interface IQueryExecution

getDatasetHeader

public DatasetHeader getDatasetHeader()

Specified by:

getDatasetHeader in interface IQueryExecution

getStatus

public ExecutionResult getStatus()

This method is a synchronized method. For READ, it will block until all the FragmentInstances have been submitted. For WRITE, it will block until all the FragmentInstances have finished.

Specified by:

getStatus in interface IQueryExecution

Returns:

ExecutionStatus. Contains the QueryId and the TSStatus.

getDistributedPlan

public DistributedQueryPlan getDistributedPlan()

getLogicalPlan

public LogicalQueryPlan getLogicalPlan()

isQuery

public boolean isQuery()

Specified by:

isQuery in interface IQueryExecution

getQueryId

public java.lang.String getQueryId()

Specified by:

getQueryId in interface IQueryExecution

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object