Package org.apache.druid.segment

Class UnnestSegment

java.lang.Object

org.apache.druid.segment.WrappedSegment

org.apache.druid.segment.UnnestSegment

All Implemented Interfaces:

Closeable, AutoCloseable, Segment

public class UnnestSegment
extends WrappedSegment

Field Summary

Fields inherited from class org.apache.druid.segment.WrappedSegment

delegate

Constructor Summary

Constructors

Constructor	Description
UnnestSegment(Segment delegate, VirtualColumn unnestColumn, DimFilter filter)

Method Summary

Modifier and Type	Method	Description
<T> T	as(Class<T> clazz)	Request an implementation of a particular interface.
String	getDebugString()	Developer friendly string suitable to use in internal error messages and provide some additional information about what kind of segment was involved in a problem

Methods inherited from class org.apache.druid.segment.WrappedSegment

close, getDataInterval, getId, isTombstone, validateOrElseThrow

Methods inherited from class java.lang.Object

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

Constructor Details

UnnestSegment

public UnnestSegment(Segment delegate,
 VirtualColumn unnestColumn,
 @Nullable
 DimFilter filter)

Method Details

as

@Nullable
public <T> T as(@Nonnull
 Class<T> clazz)

Description copied from interface: Segment

Request an implementation of a particular interface.

All implementations of this method should be able to provide a CursorFactory. Other interfaces are only expected to be requested by callers that have specific knowledge of extra features provided by specific segment types. For example, an extension might provide a custom Segment type that can offer both CursorFactory and some new interface. That extension can also offer a Query that uses that new interface.

Implementations which accept classes other than known built-in interfaces such as CursorFactory are limited to using those classes within the extension. This means that one extension cannot rely on the `Segment.as` behavior of another extension.

Type Parameters:

T - desired interface

Parameters:

clazz - desired interface

Returns:

instance of clazz, or null if the interface is not supported by this segment, one of the following:

• CursorFactory, to make cursors to run queries. Never null.
• QueryableIndex, index object, if this is a memory-mapped regular segment.
• IndexedTable, table object, if this is a joinable indexed table.
• TimeBoundaryInspector, inspector for min/max timestamps, if supported by this segment.
• PhysicalSegmentInspector, inspector for physical segment details, if supported by this segment.
• MaxIngestedEventTimeInspector, inspector for DataSourceMetadataResultValue.getMaxIngestedEventTime()
• TopNOptimizationInspector, inspector containing information for topN specific optimizations
• CloseableShapeshifter, stepping stone to RowsAndColumns.
• BypassRestrictedSegment, a policy-aware segment, converted from a policy-enforced segment.

getDebugString

public String getDebugString()

Description copied from interface: Segment

Developer friendly string suitable to use in internal error messages and provide some additional information about what kind of segment was involved in a problem