Package org.elasticsearch.xpack.esql.expression.function.aggregate

Class DeltaOnlyHistogramMergeOverTime

java.lang.Object

org.elasticsearch.xpack.esql.core.tree.Node<Expression>

org.elasticsearch.xpack.esql.core.expression.Expression

org.elasticsearch.xpack.esql.core.expression.function.Function

org.elasticsearch.xpack.esql.expression.function.aggregate.AggregateFunction

org.elasticsearch.xpack.esql.expression.function.aggregate.TimeSeriesAggregateFunction

org.elasticsearch.xpack.esql.expression.function.aggregate.DeltaOnlyHistogramMergeOverTime

All Implemented Interfaces:

NamedWriteable, Writeable, PostAnalysisPlanVerificationAware, TransportVersionAware, Resolvable, OptionalArgument, TemporalityAware, ToAggregator

public class DeltaOnlyHistogramMergeOverTime
extends TimeSeriesAggregateFunction
implements OptionalArgument, ToAggregator, TemporalityAware, TransportVersionAware

Time series variant of HistogramMerge. In addition to merging histograms, this implementation also loads the temporality and ignores cumulative histograms (with a warning).

For backwards compatibility, the intermediate state produced by this aggregation is compatible with HistogramMerge: In previous versions, we used HistogramMerge directly as per-timeseries aggregation.

Nested Class Summary

Nested classes/interfaces inherited from class org.elasticsearch.xpack.esql.core.expression.Expression

Expression.TypeResolution

Nested classes/interfaces inherited from class org.elasticsearch.xpack.esql.core.tree.Node

Node.NodeStringFormat

Nested classes/interfaces inherited from interface org.elasticsearch.common.io.stream.Writeable

Writeable.Reader<V>, Writeable.Writer<V>

Field Summary

Fields

Modifier and Type	Field	Description
static final TransportVersion	DEDICATED_AGGREGATOR	Prior to this version, DeltaOnlyHistogramMergeOverTime had no aggregator.
static final NamedWriteableRegistry.Entry	ENTRY

Fields inherited from class org.elasticsearch.xpack.esql.expression.function.aggregate.AggregateFunction

NO_WINDOW, WINDOW_INTERVAL

Fields inherited from class org.elasticsearch.xpack.esql.core.tree.Node

TO_STRING_MAX_LINES, TO_STRING_MAX_WIDTH

Constructor Summary

Constructors

Constructor	Description
DeltaOnlyHistogramMergeOverTime(Source source, Expression field, Expression window)
DeltaOnlyHistogramMergeOverTime(Source source, Expression field, Expression filter, Expression window)
DeltaOnlyHistogramMergeOverTime(Source source, Expression field, Expression filter, Expression window, Expression temporality)

Method Summary

Modifier and Type	Method	Description
DataType	dataType()	The DataType returned by executing the tree rooted at this expression.
Expression	forTransportVersion(TransportVersion minTransportVersion)	Returns the expression to be replaced by or null if this cannot be replaced.
String	getWriteableName()
protected NodeInfo<DeltaOnlyHistogramMergeOverTime>	info()	Normally, you want to use one of the static create methods to implement this.
DeltaOnlyHistogramMergeOverTime	perTimeSeriesAggregation()	Returns the aggregation function to be used in the first aggregation stage, which is grouped by `_tsid` (and `time_bucket`).
DeltaOnlyHistogramMergeOverTime	replaceChildren(List<Expression> newChildren)
protected Expression.TypeResolution	resolveType()	The implementation of Expression.typeResolved(), which is just a caching wrapper around this method.
AggregatorFunctionSupplier	supplier()
Expression	temporality()	The current value for the temporality argument of the function.
DeltaOnlyHistogramMergeOverTime	withFilter(Expression filter)	Attach a filter to the aggregate function.
DeltaOnlyHistogramMergeOverTime	withTemporality(Expression newTemporality)	Returns a copy of this function with the provided value as temporality argument.

Methods inherited from class org.elasticsearch.xpack.esql.expression.function.aggregate.TimeSeriesAggregateFunction

aggregateInputReferences, requiredTimeSeriesSource

Methods inherited from class org.elasticsearch.xpack.esql.expression.function.aggregate.AggregateFunction

equals, field, filter, hasFilter, hashCode, hasWindow, parameters, postAnalysisPlanVerification, readWindow, window, withField, withFilter, withFilter, withParameters, withWindow, writeTo

Methods inherited from class org.elasticsearch.xpack.esql.core.expression.function.Function

arguments, functionName, nodeString, nullable

Methods inherited from class org.elasticsearch.xpack.esql.core.expression.Expression

canonical, canonicalize, childrenResolved, fold, foldable, propertiesToString, references, resolved, semanticEquals, semanticHash, toString, toString, typeResolved

Methods inherited from class org.elasticsearch.xpack.esql.core.tree.Node

allMatch, anyMatch, children, collect, collect, collect, collectFirstChildren, collectLeaves, doCollectFirst, forEachDown, forEachDown, forEachDownMayReturnEarly, forEachProperty, forEachPropertyDown, forEachPropertyOnly, forEachPropertyUp, forEachUp, forEachUp, nodeName, nodeProperties, nodeString, replaceChildrenSameSize, source, sourceLocation, sourceText, toString, transformChildren, transformChildren, transformDown, transformDown, transformDown, transformDown, transformDownSkipBranch, transformNodeProps, transformPropertiesDown, transformPropertiesOnly, transformPropertiesUp, transformUp, transformUp, transformUp

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

DEDICATED_AGGREGATOR

public static final TransportVersion DEDICATED_AGGREGATOR

Prior to this version, DeltaOnlyHistogramMergeOverTime had no aggregator. Instead, it was always replaced with HistogramMerge in perTimeSeriesAggregation().

ENTRY

public static final NamedWriteableRegistry.Entry ENTRY

Constructor Details

DeltaOnlyHistogramMergeOverTime

public DeltaOnlyHistogramMergeOverTime(Source source,
 Expression field,
 Expression window)

DeltaOnlyHistogramMergeOverTime

public DeltaOnlyHistogramMergeOverTime(Source source,
 Expression field,
 Expression filter,
 Expression window)

DeltaOnlyHistogramMergeOverTime

public DeltaOnlyHistogramMergeOverTime(Source source,
 Expression field,
 Expression filter,
 Expression window,
 @Nullable
 Expression temporality)

Method Details

resolveType

protected Expression.TypeResolution resolveType()

Description copied from class: Expression

The implementation of Expression.typeResolved(), which is just a caching wrapper around this method. See it's javadoc for what this method should return.

Implementations will rarely interact with the Expression.TypeResolution class directly, instead usually calling the utility methods on TypeResolutions.

Implementations should fail if Expression.childrenResolved() returns false.

Overrides:

resolveType in class AggregateFunction

getWriteableName

public String getWriteableName()

Specified by:

getWriteableName in interface NamedWriteable

dataType

public DataType dataType()

Description copied from class: Expression

The DataType returned by executing the tree rooted at this expression. If Expression.typeResolved() returns an error then the behavior of this method is undefined. It may return a valid type. Or it may throw an exception. Or it may return a totally nonsensical type.

Specified by:

dataType in class Expression

info

protected NodeInfo<DeltaOnlyHistogramMergeOverTime> info()

Description copied from class: Node

Normally, you want to use one of the static create methods to implement this.

For QueryPlans, it is very important that the properties contain all of the expressions and references relevant to this node, and that all the properties are used in the provided constructor; otherwise query plan transformations like QueryPlan#transformExpressionsOnly(Function) will not have an effect.

Specified by:

info in class Node<Expression>

replaceChildren

public DeltaOnlyHistogramMergeOverTime replaceChildren(List<Expression> newChildren)

Specified by:

replaceChildren in class Node<Expression>

withFilter

public DeltaOnlyHistogramMergeOverTime withFilter(Expression filter)

Description copied from class: AggregateFunction

Attach a filter to the aggregate function.

Specified by:

withFilter in class AggregateFunction

supplier

public AggregatorFunctionSupplier supplier()

Specified by:

supplier in interface ToAggregator

perTimeSeriesAggregation

public DeltaOnlyHistogramMergeOverTime perTimeSeriesAggregation()

Description copied from class: TimeSeriesAggregateFunction

Returns the aggregation function to be used in the first aggregation stage, which is grouped by `_tsid` (and `time_bucket`).

Specified by:

perTimeSeriesAggregation in class TimeSeriesAggregateFunction

See Also:

• TranslateTimeSeriesAggregate

temporality

public Expression temporality()

Description copied from interface: TemporalityAware

The current value for the temporality argument of the function. If this is null, it will be injected automatically during local planning.

Specified by:

temporality in interface TemporalityAware

Returns:

the current value for the temporality argument

withTemporality

public DeltaOnlyHistogramMergeOverTime withTemporality(Expression newTemporality)

Description copied from interface: TemporalityAware

Returns a copy of this function with the provided value as temporality argument.

Specified by:

withTemporality in interface TemporalityAware

forTransportVersion

public Expression forTransportVersion(TransportVersion minTransportVersion)

Description copied from interface: TransportVersionAware

Returns the expression to be replaced by or null if this cannot be replaced.

Specified by:

forTransportVersion in interface TransportVersionAware