org.verdictdb.core.querying.ola

Class AsyncAggExecutionNode

java.lang.Object

org.verdictdb.core.querying.ExecutableNodeBase

org.verdictdb.core.querying.QueryNodeBase

org.verdictdb.core.querying.QueryNodeWithPlaceHolders

org.verdictdb.core.querying.CreateTableAsSelectNode

org.verdictdb.core.querying.ProjectionNode

org.verdictdb.core.querying.ola.AsyncAggExecutionNode

All Implemented Interfaces:

Serializable, ExecutableNode

public class AsyncAggExecutionNode
extends ProjectionNode

Represents an "progressive" execution of a single aggregate query (without nested components).

Steps: 1. identify agg and nonagg columns of a given select agg query. 2. convert the query into multiple block-agg queries. 3. issue those block-agg queries one by one. 4. combine the results of those block-agg queries as the answers to those queries arrive. 5. depending on the interface, call an appropriate result handler.

Author:

Yongjoo Park

See Also:

Serialized Form

Field Summary

Fields inherited from class org.verdictdb.core.querying.QueryNodeBase

selectQuery

Method Summary

Modifier and Type	Method and Description
HashMap<List<Integer>,Double>	calculateScaleFactor(List<HyperTableCube> cubes) Currently, assume block size is uniform
static AsyncAggExecutionNode	create(IdCreator idCreator, List<ExecutableNodeBase> individualAggs, List<ExecutableNodeBase> combiners, ScrambleMetaSet meta)
SqlConvertible	createQuery(List<ExecutionInfoToken> tokens) Creates a query that should be run.
ExecutionInfoToken	createToken(DbmsQueryResult result)
ExecutableNodeBase	deepcopy()
ScrambleMetaSet	getScrambleMeta()
void	setScrambleMeta(ScrambleMetaSet meta)

Methods inherited from class org.verdictdb.core.querying.ProjectionNode

create

Methods inherited from class org.verdictdb.core.querying.CreateTableAsSelectNode

addPartitionColumn, getNamer, setNamer

Methods inherited from class org.verdictdb.core.querying.QueryNodeWithPlaceHolders

copyFields, createPlaceHolderTable, getPlaceholderTables, getPlaceholderTablesinFilter

Methods inherited from class org.verdictdb.core.querying.QueryNodeBase

copyFields, equals, getSelectQuery, setSelectQuery

Methods inherited from class org.verdictdb.core.querying.ExecutableNodeBase

cancelSubscriptionsFromAllSubscribers, cancelSubscriptionTo, copyFields, create, createSubscriptionTicket, getAggMeta, getChannelForSource, getDependentNodeCount, getExecutableNodeBaseDependent, getExecutableNodeBaseDependents, getExecutableNodeBaseParents, getGroupId, getMethodsToInvokeOnConnection, getNotified, getSourceQueues, getSources, getSourcesAndChannels, getSubscribers, hashCode, print, registerSubscriber, setAggMeta, subscribeTo, subscribeTo, toString

Methods inherited from class java.lang.Object

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

Method Detail

create

public static AsyncAggExecutionNode create(IdCreator idCreator,
                                           List<ExecutableNodeBase> individualAggs,
                                           List<ExecutableNodeBase> combiners,
                                           ScrambleMetaSet meta)
                                    throws VerdictDBValueException

Throws:

VerdictDBValueException

createQuery

public SqlConvertible createQuery(List<ExecutionInfoToken> tokens)
                           throws VerdictDBException

Description copied from interface: ExecutableNode

Creates a query that should be run. Its result will be handed to createToken().

Specified by:

createQuery in interface ExecutableNode

Overrides:

createQuery in class ProjectionNode

Returns:

Throws:

VerdictDBException

createToken

public ExecutionInfoToken createToken(DbmsQueryResult result)

Specified by:

createToken in interface ExecutableNode

Overrides:

createToken in class ProjectionNode

deepcopy

public ExecutableNodeBase deepcopy()

Overrides:

deepcopy in class ProjectionNode

getScrambleMeta

public ScrambleMetaSet getScrambleMeta()

setScrambleMeta

public void setScrambleMeta(ScrambleMetaSet meta)

calculateScaleFactor

public HashMap<List<Integer>,Double> calculateScaleFactor(List<HyperTableCube> cubes)

Currently, assume block size is uniform

Returns:

Return tier permutation list and its scale factor