All Known Implementing Classes:

BaseQuery, DataSourceMetadataQuery, GroupByQuery, ScanQuery, SearchQuery, SegmentMetadataQuery, SelectQuery, TimeBoundaryQuery, TimeseriesQuery, TopNQuery, WindowOperatorQuery
```
public interface Query<T>
```

Field Summary

Fields
Modifier and Type	Field	Description
`static String`	`DATASOURCE_METADATA`
`static String`	`GROUP_BY`
`static String`	`SCAN`
`static String`	`SEARCH`
`static String`	`SEGMENT_METADATA`
`static String`	`SELECT`
`static String`	`TIME_BOUNDARY`
`static String`	`TIMESERIES`
`static String`	`TOPN`
`static String`	`WINDOW_OPERATOR`

Method Summary

All Methods Instance Methods Abstract Methods Default Methods Deprecated Methods
Modifier and Type	Method	Description
`default QueryContext`	`context()`	Returns the query context as a `QueryContext`, which provides convenience methods for accessing typed context values.
`Map<String,Object>`	`getContext()`	Returns the context as an (immutable) map.
`default boolean`	`getContextBoolean(String key, boolean defaultValue)`	Deprecated. use `queryContext().getBoolean()` instead.
`default HumanReadableBytes`	`getContextHumanReadableBytes(String key, HumanReadableBytes defaultValue)`	Deprecated. use `queryContext().getContextHumanReadableBytes()` instead.
`default <ContextType> ContextType`	`getContextValue(String key)`	Deprecated. use `queryContext().get<Type>()` instead
`DataSource`	`getDataSource()`
`org.joda.time.Duration`	`getDuration()`
`DimFilter`	`getFilter()`
`Granularity`	`getGranularity()`
`String`	`getId()`
`List<org.joda.time.Interval>`	`getIntervals()`
`default String`	`getMostSpecificId()`	Returns a most specific ID of this query; if it is a subquery, this will return its subquery ID.
`default Set<String>`	`getRequiredColumns()`	Returns the set of columns that this query will need to access out of its datasource.
`com.google.common.collect.Ordering<T>`	`getResultOrdering()`	Comparator that represents the order in which results are generated from the `QueryRunnerFactory.createRunner(Segment)` and `QueryRunnerFactory.mergeRunners(QueryProcessingPool, Iterable)` calls.
`QueryRunner<T>`	`getRunner(QuerySegmentWalker walker)`
`default String`	`getSqlQueryId()`
`String`	`getSubQueryId()`	Returns the subQueryId of this query.
`org.joda.time.DateTimeZone`	`getTimezone()`
`String`	`getType()`
`default VirtualColumns`	`getVirtualColumns()`
`boolean`	`hasFilters()`
`boolean`	`isDescending()`
`default Query<T>`	`optimizeForSegment(PerSegmentQueryOptimizationContext optimizationContext)`
`Query<T>`	`withDataSource(DataSource dataSource)`
`default Query<T>`	`withDefaultSubQueryId()`
`Query<T>`	`withId(String id)`
`default Query<T>`	`withLane(String lane)`
`Query<T>`	`withOverriddenContext(Map<String,Object> contextOverride)`
`default Query<T>`	`withPriority(int priority)`
`Query<T>`	`withQuerySegmentSpec(QuerySegmentSpec spec)`	Returns a new query, identical to this one, but with a different associated `QuerySegmentSpec`.
`default Query<T>`	`withSqlQueryId(String sqlQueryId)`
`Query<T>`	`withSubQueryId(String subQueryId)`	Returns a copy of this query with a new subQueryId (see `getSubQueryId()`.

- Field Detail
  - DATASOURCE_METADATA
```
static final String DATASOURCE_METADATA
```
    See Also:
    
    Constant Field Values
  - GROUP_BY
```
static final String GROUP_BY
```
    See Also:
    
    Constant Field Values
  - SCAN
```
static final String SCAN
```
    See Also:
    
    Constant Field Values
  - SEARCH
```
static final String SEARCH
```
    See Also:
    
    Constant Field Values
  - SEGMENT_METADATA
```
static final String SEGMENT_METADATA
```
    See Also:
    
    Constant Field Values
  - SELECT
```
static final String SELECT
```
    See Also:
    
    Constant Field Values
  - TIME_BOUNDARY
```
static final String TIME_BOUNDARY
```
    See Also:
    
    Constant Field Values
  - TIMESERIES
```
static final String TIMESERIES
```
    See Also:
    
    Constant Field Values
  - TOPN
```
static final String TOPN
```
    See Also:
    
    Constant Field Values
  - WINDOW_OPERATOR
```
static final String WINDOW_OPERATOR
```
    See Also:
    
    Constant Field Values
- Method Detail
  - getDataSource
```
DataSource getDataSource()
```
  - hasFilters
```
boolean hasFilters()
```
  - getFilter
```
DimFilter getFilter()
```
  - getType
```
String getType()
```
  - getRunner
```
QueryRunner<T> getRunner(QuerySegmentWalker walker)
```
  - getIntervals
```
List<org.joda.time.Interval> getIntervals()
```
  - getDuration
```
org.joda.time.Duration getDuration()
```
  - getGranularity
```
Granularity getGranularity()
```
  - getTimezone
```
org.joda.time.DateTimeZone getTimezone()
```
  - getContext
```
Map<String,Object> getContext()
```
    Returns the context as an (immutable) map.
  - context
```
default QueryContext context()
```
    Returns the query context as a QueryContext, which provides convenience methods for accessing typed context values. The returned instance is a view on top of the context provided by getContext().
    The default implementation is for backward compatibility. Derived classes should store and return the QueryContext directly.
  - getContextValue
```
@Deprecated
@Nullable
default <ContextType> ContextType getContextValue(String key)
```
    Deprecated.
    use queryContext().get<Type>() instead
    
    Get context value and cast to ContextType in an unsafe way. For safe conversion, it's recommended to use following methods instead:
    QueryContext.getBoolean(String)
    QueryContext.getString(String)
    QueryContext.getInt(String)
    QueryContext.getLong(String)
    QueryContext.getFloat(String)
    QueryContext.getEnum(String, Class, Enum)
    QueryContext.getHumanReadableBytes(String, HumanReadableBytes)
  - getContextBoolean
```
@Deprecated
default boolean getContextBoolean(String key,
                                  boolean defaultValue)
```
    Deprecated.
    use queryContext().getBoolean() instead.
  - getContextHumanReadableBytes
```
@Deprecated
default HumanReadableBytes getContextHumanReadableBytes(String key,
                                                        HumanReadableBytes defaultValue)
```
    Deprecated.
    use queryContext().getContextHumanReadableBytes() instead.
    
    Returns HumanReadableBytes for a specified context key. If the context is null or the key doesn't exist a caller specified default value is returned. A default implementation is provided since Query is an extension point. Extensions can choose to rely on this default to retain compatibility with core Druid.
    
    Parameters:
    
    key - The context key value being looked up
    
    defaultValue - The default to return if the key value doesn't exist or the context is null.
    
    Returns:
    
    HumanReadableBytes
  - isDescending
```
boolean isDescending()
```
  - getResultOrdering
```
com.google.common.collect.Ordering<T> getResultOrdering()
```
    Comparator that represents the order in which results are generated from the QueryRunnerFactory.createRunner(Segment) and QueryRunnerFactory.mergeRunners(QueryProcessingPool, Iterable) calls. This is used to combine streams of results from different sources; for example, it's used by historicals to combine streams from different segments, and it's used by the broker to combine streams from different historicals. Important note: sometimes, this ordering is used in a type-unsafe way to order @{code Result} objects. Because of this, implementations should fall back to Ordering.natural() when they are given an object that is not of type T.
  - withOverriddenContext
```
Query<T> withOverriddenContext(Map<String,Object> contextOverride)
```
  - withQuerySegmentSpec
```
Query<T> withQuerySegmentSpec(QuerySegmentSpec spec)
```
    Returns a new query, identical to this one, but with a different associated QuerySegmentSpec. This often changes the behavior of 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).
  - withId
```
Query<T> withId(String id)
```
  - getId
```
@Nullable
String getId()
```
  - withSubQueryId
```
Query<T> withSubQueryId(String subQueryId)
```
    Returns a copy of this query with a new subQueryId (see getSubQueryId().
  - withDefaultSubQueryId
```
default Query<T> withDefaultSubQueryId()
```
  - getSubQueryId
```
@Nullable
String getSubQueryId()
```
    Returns the subQueryId of this query. This is set by ClientQuerySegmentWalker (the entry point for the Broker's query stack) on any subqueries that it issues. It is null for the main query.
  - withSqlQueryId
```
default Query<T> withSqlQueryId(String sqlQueryId)
```
  - getSqlQueryId
```
@Nullable
default String getSqlQueryId()
```
  - getMostSpecificId
```
default String getMostSpecificId()
```
    Returns a most specific ID of this query; if it is a subquery, this will return its subquery ID. If it is a regular query without subqueries, this will return its query ID. This method should be called after the relevant ID is assigned using withId(java.lang.String) or withSubQueryId(java.lang.String).
  - withDataSource
```
Query<T> withDataSource(DataSource dataSource)
```
  - optimizeForSegment
```
default Query<T> optimizeForSegment(PerSegmentQueryOptimizationContext optimizationContext)
```
  - withPriority
```
default Query<T> withPriority(int priority)
```
  - withLane
```
default Query<T> withLane(String lane)
```
  - getVirtualColumns
```
default VirtualColumns getVirtualColumns()
```
  - getRequiredColumns
```
@Nullable
default Set<String> getRequiredColumns()
```
    Returns the set of columns that this query will need to access out of its datasource. This method does not "look into" what the datasource itself is doing. For example, if a query is built on a QueryDataSource, this method will not return the columns used by that subquery. As another example, if a query is built on a JoinDataSource, this method will not return the columns from the underlying datasources that are used by the join condition, unless those columns are also used by this query in other ways. Returns null if the set of required columns cannot be known ahead of time.

Interface Query<T>

Field Summary

Method Summary

Field Detail

DATASOURCE_METADATA

GROUP_BY

SCAN

SEARCH

SEGMENT_METADATA

SELECT

TIME_BOUNDARY

TIMESERIES

TOPN

WINDOW_OPERATOR

Method Detail

getDataSource

hasFilters

getFilter

getType

getRunner

getIntervals

getDuration

getGranularity

getTimezone

getContext

context

getContextValue

getContextBoolean

getContextHumanReadableBytes

isDescending

getResultOrdering

withOverriddenContext

withQuerySegmentSpec

withId

getId

withSubQueryId

withDefaultSubQueryId

getSubQueryId

withSqlQueryId

getSqlQueryId

getMostSpecificId

withDataSource

optimizeForSegment

withPriority

withLane

getVirtualColumns

getRequiredColumns