Module org.elasticsearch.compute

Package org.elasticsearch.compute.operator

Class ChangePointOperator

java.lang.Object

org.elasticsearch.compute.operator.ChangePointOperator

All Implemented Interfaces:

Closeable, AutoCloseable, Operator, Releasable

public class ChangePointOperator
extends Object
implements Operator

Find spikes, dips and change points in a list of values.

In grouped mode the operator streams output per group: as soon as a group boundary is detected in the grouped input, the completed group is flushed through the change-point detector, annotated, and queued for output.

In non-grouped mode all input is buffered until finish() because the single implicit group cannot complete earlier.

Warning: even in grouped mode the operator cannot handle large groups! It buffers all data for the current group, runs the change point detector (which is a compute-heavy process), and then outputs the annotated data.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final record	ChangePointOperator.Factory

Nested classes/interfaces inherited from interface org.elasticsearch.compute.operator.Operator

Operator.OperatorFactory, Operator.Status

Field Summary

Fields

Modifier and Type	Field	Description
static final int	INPUT_VALUE_COUNT_LIMIT

Fields inherited from interface org.elasticsearch.compute.operator.Operator

MIN_TARGET_PAGE_SIZE, NOT_BLOCKED, TARGET_PAGE_SIZE

Constructor Summary

Constructors

Constructor	Description
ChangePointOperator(DriverContext driverContext, int channel, int[] groupingChannels, WarningSourceLocation source)

Method Summary

Modifier and Type	Method	Description
void	addInput(Page page)	adds an input page to the operator.
boolean	canProduceMoreDataWithoutExtraInput()	Returns true if the operator can produce more output pages without requiring additional input pages.
void	close()	notifies the operator that it won't be used anymore (i.e.
void	finish()	notifies the operator that it won't receive any more input pages
Page	getOutput()	returns non-null if output page available.
boolean	isFinished()	whether the operator has finished processing all input pages and made the corresponding output pages available
boolean	needsInput()	whether the given operator can accept more input pages
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.elasticsearch.compute.operator.Operator

isBlocked, status, tryPromote

Field Details

INPUT_VALUE_COUNT_LIMIT

public static final int INPUT_VALUE_COUNT_LIMIT

See Also:

• Constant Field Values

Constructor Details

ChangePointOperator

public ChangePointOperator(DriverContext driverContext,
 int channel,
 int[] groupingChannels,
 WarningSourceLocation source)

Method Details

needsInput

public boolean needsInput()

Description copied from interface: Operator

whether the given operator can accept more input pages

Specified by:

needsInput in interface Operator

addInput

public void addInput(Page page)

Description copied from interface: Operator

adds an input page to the operator. only called when needsInput() == true and isFinished() == false

Specified by:

addInput in interface Operator

finish

public void finish()

Description copied from interface: Operator

notifies the operator that it won't receive any more input pages

Specified by:

finish in interface Operator

isFinished

public boolean isFinished()

Description copied from interface: Operator

whether the operator has finished processing all input pages and made the corresponding output pages available

Specified by:

isFinished in interface Operator

getOutput

public Page getOutput()

Description copied from interface: Operator

returns non-null if output page available. Only called when isFinished() == false

Specified by:

getOutput in interface Operator

canProduceMoreDataWithoutExtraInput

public boolean canProduceMoreDataWithoutExtraInput()

Description copied from interface: Operator

Returns true if the operator can produce more output pages without requiring additional input pages. This is useful for operators that buffer data or have internal state that can produce multiple output pages.

Operators that do not buffer data should return false - they cannot produce pages out of thin air. Examples of operators that may return true:

• Operators with internal buffers (e.g., AsyncOperator with pending results)
• Operators processing a single input page into multiple output pages
• Aggregation operators that buffer partial results

Specified by:

canProduceMoreDataWithoutExtraInput in interface Operator

Returns:

true if the operator has buffered data that can produce output, false otherwise

close

public void close()

Description copied from interface: Operator

notifies the operator that it won't be used anymore (i.e. none of the other methods called), and its resources can be cleaned up

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in interface Operator

Specified by:

close in interface Releasable

toString

public String toString()

Overrides:

toString in class Object