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

Class DefaultTimeSeriesAggregateFunction

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.DefaultTimeSeriesAggregateFunction

All Implemented Interfaces:

NamedWriteable, Writeable, PostAnalysisPlanVerificationAware, Resolvable, OptionalArgument, SurrogateExpression

public class DefaultTimeSeriesAggregateFunction
extends TimeSeriesAggregateFunction
implements SurrogateExpression

An implicit default time-series aggregation function that delegates to the appropriate time-series aggregation function based on the field's data type.

The purpose of this class is to provide a better type resolution error message for implicit time-series aggregations. It avoids having to change the source text of the field expression, which would be more invasive.

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 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
DefaultTimeSeriesAggregateFunction(Expression field, Expression timestamp)
DefaultTimeSeriesAggregateFunction(Source source, Expression field, Expression filter, Expression window, Expression timestamp)

Method Summary

Modifier and Type	Method	Description
boolean	childrenResolved()
DataType	dataType()	The DataType returned by executing the tree rooted at this expression.
String	getWriteableName()
protected NodeInfo<DefaultTimeSeriesAggregateFunction>	info()	Normally, you want to use one of the static create methods to implement this.
AggregateFunction	perTimeSeriesAggregation()	Returns the aggregation function to be used in the first aggregation stage, which is grouped by `_tsid` (and `time_bucket`).
Expression	replaceChildren(List<Expression> newChildren)
Expression.TypeResolution	resolveType()	The implementation of Expression.typeResolved(), which is just a caching wrapper around this method.
Expression	surrogate()	Returns the expression to be replaced by or null if this cannot be replaced.
String	toString()
AggregateFunction	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, 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, fold, foldable, propertiesToString, references, resolved, semanticEquals, semanticHash, 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, 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

Constructor Details

DefaultTimeSeriesAggregateFunction

public DefaultTimeSeriesAggregateFunction(Expression field,
 Expression timestamp)

DefaultTimeSeriesAggregateFunction

public DefaultTimeSeriesAggregateFunction(Source source,
 Expression field,
 Expression filter,
 Expression window,
 Expression timestamp)

Method Details

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

withFilter

public AggregateFunction withFilter(Expression filter)

Description copied from class: AggregateFunction

Attach a filter to the aggregate function.

Specified by:

withFilter in class AggregateFunction

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

replaceChildren

public Expression replaceChildren(List<Expression> newChildren)

Specified by:

replaceChildren in class Node<Expression>

info

protected NodeInfo<DefaultTimeSeriesAggregateFunction> 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>

getWriteableName

public String getWriteableName()

Specified by:

getWriteableName in interface NamedWriteable

resolveType

public 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

surrogate

public Expression surrogate()

Description copied from interface: SurrogateExpression

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

Specified by:

surrogate in interface SurrogateExpression

toString

public String toString()

Overrides:

toString in class Expression

childrenResolved

public boolean childrenResolved()

Overrides:

childrenResolved in class Expression