Package org.apache.pinot.query.runtime.operator

Class LeafStageTransferableBlockOperator

java.lang.Object

org.apache.pinot.query.runtime.operator.MultiStageOperator

org.apache.pinot.query.runtime.operator.LeafStageTransferableBlockOperator

All Implemented Interfaces:

AutoCloseable, Operator<TransferableBlock>

public class LeafStageTransferableBlockOperator
extends MultiStageOperator

Leaf-stage transfer block operator is used to wrap around the leaf stage process results. They are passed to the Pinot server to execute query thus only one DataTable were returned. However, to conform with the intermediate stage operators. An additional MetadataBlock needs to be transferred after the data block.

In order to achieve this:

• The leaf-stage result is split into data payload block and metadata payload block.
• In case the leaf-stage result contains error or only metadata, we skip the data payload block.
• Leaf-stage result blocks are in the DataSchema.getStoredColumnDataTypes() format thus requires canonicalization.

Field Summary

Fields inherited from class org.apache.pinot.query.runtime.operator.MultiStageOperator

_context, _opChainStats, _operatorId

Constructor Summary

Constructors

Constructor	Description
LeafStageTransferableBlockOperator(OpChainExecutionContext context, List<ServerQueryRequest> requests, DataSchema dataSchema, QueryExecutor queryExecutor, ExecutorService executorService)

Method Summary

Modifier and Type	Method	Description
void	close()
static void	convertRow(Object[] row, DataSchema.ColumnDataType[] inputStoredTypes, DataSchema.ColumnDataType[] outputStoredTypes)
List<MultiStageOperator>	getChildOperators()
protected TransferableBlock	getNextBlock()
protected boolean	shouldCollectStats()	Leaf stage operators should always collect stats for the tables used in queries Otherwise the Broker response will just contain zeros for every stat value
String	toExplainString()

Methods inherited from class org.apache.pinot.query.runtime.operator.MultiStageOperator

cancel, getOperatorId, nextBlock

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.pinot.core.common.Operator

explainPlan, getExecutionStatistics, getIndexSegment, prepareForExplainPlan

Constructor Detail

LeafStageTransferableBlockOperator

public LeafStageTransferableBlockOperator(OpChainExecutionContext context,
                                          List<ServerQueryRequest> requests,
                                          DataSchema dataSchema,
                                          QueryExecutor queryExecutor,
                                          ExecutorService executorService)

Method Detail

getChildOperators

public List<MultiStageOperator> getChildOperators()

Specified by:

getChildOperators in interface Operator<TransferableBlock>

Overrides:

getChildOperators in class MultiStageOperator

toExplainString

public String toExplainString()

getNextBlock

protected TransferableBlock getNextBlock()

Specified by:

getNextBlock in class MultiStageOperator

shouldCollectStats

protected boolean shouldCollectStats()

Leaf stage operators should always collect stats for the tables used in queries Otherwise the Broker response will just contain zeros for every stat value

Overrides:

shouldCollectStats in class MultiStageOperator

close

public void close()

Specified by:

close in interface AutoCloseable

Overrides:

close in class MultiStageOperator

convertRow

public static void convertRow(Object[] row,
                              DataSchema.ColumnDataType[] inputStoredTypes,
                              DataSchema.ColumnDataType[] outputStoredTypes)