org.apache.druid.segment.incremental

Class IncrementalIndexStorageAdapter

java.lang.Object

org.apache.druid.segment.incremental.IncrementalIndexStorageAdapter

All Implemented Interfaces:

ColumnInspector, CursorFactory, StorageAdapter

public class IncrementalIndexStorageAdapter
extends Object
implements StorageAdapter

Constructor Summary

Constructors

Constructor and Description
IncrementalIndexStorageAdapter(IncrementalIndex<?> index)

Method Summary

Modifier and Type	Method and Description
Indexed<String>	getAvailableDimensions()
Iterable<String>	getAvailableMetrics()
ColumnCapabilities	getColumnCapabilities(String column) Returns capabilities of a particular column, if known.
String	getColumnTypeName(String column) Like ColumnCapabilities.getType(), but may return a more descriptive string for complex columns.
int	getDimensionCardinality(String dimension) Returns the number of distinct values for the given column if known, or Integer.MAX_VALUE if unknown, e.
org.joda.time.Interval	getInterval()
org.joda.time.DateTime	getMaxIngestedEventTime()
org.joda.time.DateTime	getMaxTime()
Comparable	getMaxValue(String column)
Metadata	getMetadata()
org.joda.time.DateTime	getMinTime()
Comparable	getMinValue(String column)
int	getNumRows()
ColumnCapabilities	getSnapshotColumnCapabilities(String column) Sad workaround for SegmentAnalyzer to deal with the fact that the response from getColumnCapabilities(java.lang.String) is not accurate for string columns, in that it reports all string string columns as having multiple values.
Sequence<Cursor>	makeCursors(Filter filter, org.joda.time.Interval interval, VirtualColumns virtualColumns, Granularity gran, boolean descending, QueryMetrics<?> queryMetrics) Creates a sequence of Cursors, one for each time-granular bucket (based on the provided Granularity).

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.segment.CursorFactory

canVectorize, makeVectorCursor

Constructor Detail

IncrementalIndexStorageAdapter

public IncrementalIndexStorageAdapter(IncrementalIndex<?> index)

Method Detail

getInterval

public org.joda.time.Interval getInterval()

Specified by:

getInterval in interface StorageAdapter

getAvailableDimensions

public Indexed<String> getAvailableDimensions()

Specified by:

getAvailableDimensions in interface StorageAdapter

getAvailableMetrics

public Iterable<String> getAvailableMetrics()

Specified by:

getAvailableMetrics in interface StorageAdapter

getDimensionCardinality

public int getDimensionCardinality(String dimension)

Description copied from interface: StorageAdapter

Returns the number of distinct values for the given column if known, or Integer.MAX_VALUE if unknown, e. g. the column is numeric. If the column doesn't exist, returns 0.

Specified by:

getDimensionCardinality in interface StorageAdapter

getNumRows

public int getNumRows()

Specified by:

getNumRows in interface StorageAdapter

getMinTime

public org.joda.time.DateTime getMinTime()

Specified by:

getMinTime in interface StorageAdapter

getMaxTime

public org.joda.time.DateTime getMaxTime()

Specified by:

getMaxTime in interface StorageAdapter

getMinValue

@Nullable
public Comparable getMinValue(String column)

Specified by:

getMinValue in interface StorageAdapter

getMaxValue

@Nullable
public Comparable getMaxValue(String column)

Specified by:

getMaxValue in interface StorageAdapter

getColumnCapabilities

public ColumnCapabilities getColumnCapabilities(String column)

Description copied from interface: StorageAdapter

Returns capabilities of a particular column, if known. May be null if the column doesn't exist, or if the column does exist but the capabilities are unknown. The latter is possible with dynamically discovered columns. Note that StorageAdapters are representations of "real" segments, so they are not aware of any virtual columns that may be involved in a query. In general, query engines should instead use the method ColumnSelectorFactory.getColumnCapabilities(String), which returns capabilities for virtual columns as well.

Specified by:

getColumnCapabilities in interface ColumnInspector

Specified by:

getColumnCapabilities in interface StorageAdapter

Parameters:

column - column name

Returns:

capabilities, or null

getSnapshotColumnCapabilities

public ColumnCapabilities getSnapshotColumnCapabilities(String column)

Sad workaround for SegmentAnalyzer to deal with the fact that the response from getColumnCapabilities(java.lang.String) is not accurate for string columns, in that it reports all string string columns as having multiple values. This method returns the actual capabilities of the underlying IncrementalIndexat the time this method is called.

getColumnTypeName

public String getColumnTypeName(String column)

Description copied from interface: StorageAdapter

Like ColumnCapabilities.getType(), but may return a more descriptive string for complex columns.

Specified by:

getColumnTypeName in interface StorageAdapter

Parameters:

column - column name

Returns:

type name

getMaxIngestedEventTime

public org.joda.time.DateTime getMaxIngestedEventTime()

Specified by:

getMaxIngestedEventTime in interface StorageAdapter

makeCursors

public Sequence<Cursor> makeCursors(@Nullable
                                    Filter filter,
                                    org.joda.time.Interval interval,
                                    VirtualColumns virtualColumns,
                                    Granularity gran,
                                    boolean descending,
                                    @Nullable
                                    QueryMetrics<?> queryMetrics)

Description copied from interface: CursorFactory

Creates a sequence of Cursors, one for each time-granular bucket (based on the provided Granularity).

Specified by:

makeCursors in interface CursorFactory

getMetadata

public Metadata getMetadata()

Specified by:

getMetadata in interface StorageAdapter