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

Class VarianceOverTime

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.VarianceOverTime

All Implemented Interfaces:

NamedWriteable, Writeable, PostAnalysisPlanVerificationAware, Resolvable

public class VarianceOverTime
extends TimeSeriesAggregateFunction

Similar to Variance, but it is used to calculate the variance over a time series of values from the given field.

Nested Class Summary

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

Expression.TypeResolution

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

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

Field Summary

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_WIDTH

Constructor Summary

Constructors

Constructor	Description
VarianceOverTime(Source source, Expression field)
VarianceOverTime(Source source, Expression field, Expression filter, Expression window)

Method Summary

Modifier and Type	Method	Description
DataType	dataType()
String	getWriteableName()
protected NodeInfo<VarianceOverTime>	info()
AggregateFunction	perTimeSeriesAggregation()	Returns the aggregation function to be used in the first aggregation stage, which is grouped by `_tsid` (and `time_bucket`).
VarianceOverTime	replaceChildren(List<Expression> newChildren)
protected Expression.TypeResolution	resolveType()
VarianceOverTime	withFilter(Expression filter)	Attach a filter to the aggregate function.

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, withParameters, 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, typeResolved

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

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

Methods inherited from class java.lang.Object

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

Constructor Details

VarianceOverTime

public VarianceOverTime(Source source,
 Expression field)

VarianceOverTime

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

Method Details

resolveType

protected Expression.TypeResolution resolveType()

Overrides:

resolveType in class AggregateFunction

getWriteableName

public String getWriteableName()

dataType

public DataType dataType()

Specified by:

dataType in class Expression

info

protected NodeInfo<VarianceOverTime> info()

Specified by:

info in class Node<Expression>

replaceChildren

public VarianceOverTime replaceChildren(List<Expression> newChildren)

Specified by:

replaceChildren in class Node<Expression>

withFilter

public VarianceOverTime withFilter(Expression filter)

Description copied from class: AggregateFunction

Attach a filter to the aggregate function.

Specified by:

withFilter in class AggregateFunction

perTimeSeriesAggregation

public AggregateFunction 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