org.apache.druid.query.operator

Class WindowOperatorQuery

java.lang.Object

org.apache.druid.query.BaseQuery<RowsAndColumns>

org.apache.druid.query.operator.WindowOperatorQuery

All Implemented Interfaces:

Query<RowsAndColumns>

public class WindowOperatorQuery
extends BaseQuery<RowsAndColumns>

A query that can compute window functions on top of a completely in-memory inline datasource or query results.

It relies on a set of Operators to work on the data that it is given. As such, it doesn't actually encapsulate any window-specific logic in-and-of-itself, but rather delegates everything to the operators. This is because this is also intended as the initial addition of more explicit Operators to the Druid code base.

The assumptions on the incoming data are defined by the operators. At initial time of writing, there is a baked in assumption that data has been sorted "correctly" before this runs.

Field Summary

Fields inherited from class org.apache.druid.query.BaseQuery

QUERY_ID, SQL_QUERY_ID, SUB_QUERY_ID

Fields inherited from interface org.apache.druid.query.Query

DATASOURCE_METADATA, GROUP_BY, SCAN, SEARCH, SEGMENT_METADATA, SELECT, TIME_BOUNDARY, TIMESERIES, TOPN, WINDOW_OPERATOR

Constructor Summary

Constructors

Constructor and Description
WindowOperatorQuery(DataSource dataSource, QuerySegmentSpec intervals, Map<String,Object> context, RowSignature rowSignature, List<OperatorFactory> operators, List<OperatorFactory> leafOperators)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
DimFilter	getFilter()
List<OperatorFactory>	getLeafOperators()
List<OperatorFactory>	getOperators()
RowSignature	getRowSignature()
String	getType()
boolean	hasFilters()
int	hashCode()
String	toString()
Query<RowsAndColumns>	withDataSource(DataSource dataSource)
Query<RowsAndColumns>	withOverriddenContext(Map<String,Object> contextOverride)
Query<RowsAndColumns>	withQuerySegmentSpec(QuerySegmentSpec spec) Returns a new query, identical to this one, but with a different associated QuerySegmentSpec.

Methods inherited from class org.apache.druid.query.BaseQuery

checkInterrupted, computeOverriddenContext, computeOverridenContext, context, getContext, getDataSource, getDuration, getGranularity, getId, getIntervals, getQuerySegmentSpec, getQuerySegmentSpecForLookUp, getResultOrdering, getRunner, getSubQueryId, getTimezone, isDescending, withId, withSqlQueryId, withSubQueryId

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.query.Query

getContextBoolean, getContextHumanReadableBytes, getContextValue, getMostSpecificId, getRequiredColumns, getSqlQueryId, getVirtualColumns, optimizeForSegment, withDefaultSubQueryId, withLane, withPriority

Constructor Detail

WindowOperatorQuery

public WindowOperatorQuery(DataSource dataSource,
                           QuerySegmentSpec intervals,
                           Map<String,Object> context,
                           RowSignature rowSignature,
                           List<OperatorFactory> operators,
                           List<OperatorFactory> leafOperators)

Method Detail

getOperators

public List<OperatorFactory> getOperators()

getLeafOperators

public List<OperatorFactory> getLeafOperators()

getRowSignature

public RowSignature getRowSignature()

hasFilters

public boolean hasFilters()

getFilter

@Nullable
public DimFilter getFilter()

getType

public String getType()

withOverriddenContext

public Query<RowsAndColumns> withOverriddenContext(Map<String,Object> contextOverride)

withQuerySegmentSpec

public Query<RowsAndColumns> withQuerySegmentSpec(QuerySegmentSpec spec)

Description copied from interface: Query

Returns a new query, identical to this one, but with a different associated QuerySegmentSpec. This often changes the behavior of Query.getRunner(QuerySegmentWalker), since most queries inherit that method from BaseQuery, which implements it by calling QuerySegmentSpec.lookup(org.apache.druid.query.Query<T>, org.apache.druid.query.QuerySegmentWalker).

withDataSource

public Query<RowsAndColumns> withDataSource(DataSource dataSource)

equals

public boolean equals(Object o)

Overrides:

equals in class BaseQuery<RowsAndColumns>

hashCode

public int hashCode()

Overrides:

hashCode in class BaseQuery<RowsAndColumns>

toString

public String toString()

Overrides:

toString in class Object