org.apache.druid.segment.incremental

Class IncrementalIndexStorageAdapter

java.lang.Object

org.apache.druid.segment.incremental.IncrementalIndexStorageAdapter

All Implemented Interfaces:

Expr.InputBindingInspector, 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.
int	getDimensionCardinality(String dimension) Returns the number of distinct values for a column, or DimensionDictionarySelector.CARDINALITY_UNKNOWN if unknown.
org.joda.time.Interval	getInterval()
org.joda.time.DateTime	getMaxIngestedEventTime()
org.joda.time.DateTime	getMaxTime() Metadata-only operation that returns an upper bound on ColumnHolder.TIME_COLUMN_NAME values for this adapter.
Comparable	getMaxValue(String column) Returns the minimum value of the provided column, if known through an index, dictionary, or cache.
Metadata	getMetadata()
org.joda.time.DateTime	getMinTime() Metadata-only operation that returns a lower bound on ColumnHolder.TIME_COLUMN_NAME values for this adapter.
Comparable	getMinValue(String column) Returns the minimum value of the provided column, if known through an index, dictionary, or cache.
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 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.StorageAdapter

getRowSignature, hasBuiltInFilters, isFromTombstone

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

canVectorize, makeVectorCursor

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

getColumnCapabilitiesWithDefault, getType

Methods inherited from interface org.apache.druid.math.expr.Expr.InputBindingInspector

areNumeric, areNumeric, areSameTypes, areSameTypes, areScalar, areScalar, canVectorize, canVectorize

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 a column, or DimensionDictionarySelector.CARDINALITY_UNKNOWN if unknown. If the column doesn't exist, returns 1, because a column that doesn't exist is treated as a column of default (or null) values.

Specified by:

getDimensionCardinality in interface StorageAdapter

getNumRows

public int getNumRows()

Specified by:

getNumRows in interface StorageAdapter

getMinTime

public org.joda.time.DateTime getMinTime()

Description copied from interface: StorageAdapter

Metadata-only operation that returns a lower bound on ColumnHolder.TIME_COLUMN_NAME values for this adapter. May be earlier than the actual minimum data timestamp. For QueryableIndexStorageAdapter and IncrementalIndexStorageAdapter specifically, which back regular tables (i.e. TableDataSource), this method contract is tighter: it does return the actual minimum data timestamp. This fact is leveraged by TimeBoundaryQuery to return results using metadata only.

Specified by:

getMinTime in interface StorageAdapter

getMaxTime

public org.joda.time.DateTime getMaxTime()

Description copied from interface: StorageAdapter

Metadata-only operation that returns an upper bound on ColumnHolder.TIME_COLUMN_NAME values for this adapter. May be later than the actual maximum data timestamp. For QueryableIndexStorageAdapter and IncrementalIndexStorageAdapter specifically, which back regular tables (i.e. TableDataSource), this method contract is tighter: it does return the actual maximum data timestamp. This fact is leveraged by TimeBoundaryQuery to return results using metadata only.

Specified by:

getMaxTime in interface StorageAdapter

getMinValue

@Nullable
public Comparable getMinValue(String column)

Description copied from interface: StorageAdapter

Returns the minimum value of the provided column, if known through an index, dictionary, or cache. Returns null if not known. Does not scan the column to find the minimum value.

Specified by:

getMinValue in interface StorageAdapter

getMaxValue

@Nullable
public Comparable getMaxValue(String column)

Description copied from interface: StorageAdapter

Returns the minimum value of the provided column, if known through an index, dictionary, or cache. Returns null if not known. Does not scan the column to find the maximum value.

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 columns as having multiple values. This method returns the actual capabilities of the underlying IncrementalIndex at the time this method is called.

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