Add max_over_time aggregation for TSDB #126498
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the Elastic License | ||
| * 2.0; you may not use this file except in compliance with the Elastic License | ||
| * 2.0. | ||
| */ | ||
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| package org.elasticsearch.xpack.esql.expression.function.aggregate; | ||
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| import org.elasticsearch.common.io.stream.NamedWriteableRegistry; | ||
| import org.elasticsearch.common.io.stream.StreamInput; | ||
| import org.elasticsearch.xpack.esql.core.expression.Expression; | ||
| import org.elasticsearch.xpack.esql.core.expression.Literal; | ||
| import org.elasticsearch.xpack.esql.core.tree.NodeInfo; | ||
| import org.elasticsearch.xpack.esql.core.tree.Source; | ||
| import org.elasticsearch.xpack.esql.core.type.DataType; | ||
| import org.elasticsearch.xpack.esql.expression.function.FunctionInfo; | ||
| import org.elasticsearch.xpack.esql.expression.function.FunctionType; | ||
| import org.elasticsearch.xpack.esql.expression.function.Param; | ||
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| import java.io.IOException; | ||
| import java.util.List; | ||
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| import static java.util.Collections.emptyList; | ||
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| /** | ||
| * Similar to {@link Max}, but it is used to calculate the maximum value over a time series of values from the given field. | ||
| */ | ||
| public class MaxOverTime extends TimeSeriesAggregateFunction { | ||
| public static final NamedWriteableRegistry.Entry ENTRY = new NamedWriteableRegistry.Entry( | ||
| Expression.class, | ||
| "MaxOverTime", | ||
| MaxOverTime::new | ||
| ); | ||
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| @FunctionInfo( | ||
| returnType = { "boolean", "double", "integer", "long", "date", "date_nanos", "ip", "keyword", "long", "version" }, | ||
| description = "The maximum over time value of a field.", | ||
| type = FunctionType.AGGREGATE | ||
| ) | ||
| public MaxOverTime( | ||
| Source source, | ||
| @Param( | ||
| name = "field", | ||
| type = { | ||
| "aggregate_metric_double", | ||
| "boolean", | ||
| "double", | ||
| "integer", | ||
| "long", | ||
| "date", | ||
| "date_nanos", | ||
| "ip", | ||
| "keyword", | ||
| "text", | ||
| "long", | ||
| "version" } | ||
| ) Expression field | ||
| ) { | ||
| this(source, field, Literal.TRUE); | ||
| } | ||
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| public MaxOverTime(Source source, Expression field, Expression filter) { | ||
| super(source, field, filter, emptyList()); | ||
| } | ||
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| private MaxOverTime(StreamInput in) throws IOException { | ||
| super(in); | ||
| } | ||
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| @Override | ||
| public String getWriteableName() { | ||
| return ENTRY.name; | ||
| } | ||
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| @Override | ||
| public MaxOverTime withFilter(Expression filter) { | ||
| return new MaxOverTime(source(), field(), filter); | ||
| } | ||
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| @Override | ||
| protected NodeInfo<MaxOverTime> info() { | ||
| return NodeInfo.create(this, MaxOverTime::new, field(), filter()); | ||
| } | ||
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| @Override | ||
| public MaxOverTime replaceChildren(List<Expression> newChildren) { | ||
| return new MaxOverTime(source(), newChildren.get(0), newChildren.get(1)); | ||
| } | ||
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| @Override | ||
| protected TypeResolution resolveType() { | ||
| return perTimeSeriesAggregation().resolveType(); | ||
| } | ||
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| @Override | ||
| public DataType dataType() { | ||
| return perTimeSeriesAggregation().dataType(); | ||
| } | ||
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| @Override | ||
| public Max perTimeSeriesAggregation() { | ||
| return new Max(source(), field(), filter()); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| /* | ||
| * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| * or more contributor license agreements. Licensed under the Elastic License | ||
| * 2.0; you may not use this file except in compliance with the Elastic License | ||
| * 2.0. | ||
| */ | ||
| package org.elasticsearch.xpack.esql.expression.function.aggregate; | ||
|
|
||
| import org.elasticsearch.common.io.stream.StreamInput; | ||
| import org.elasticsearch.xpack.esql.core.expression.Expression; | ||
| import org.elasticsearch.xpack.esql.core.tree.Source; | ||
|
|
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| import java.io.IOException; | ||
| import java.util.List; | ||
|
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| /** | ||
| * Extends {@link AggregateFunction} to support aggregation per time_series, | ||
| * such as {@link Rate} or {@link MaxOverTime}. | ||
| */ | ||
| public abstract class TimeSeriesAggregateFunction extends AggregateFunction { | ||
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| protected TimeSeriesAggregateFunction(Source source, Expression field, Expression filter, List<? extends Expression> parameters) { | ||
| super(source, field, filter, parameters); | ||
| } | ||
|
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| protected TimeSeriesAggregateFunction(StreamInput in) throws IOException { | ||
| super(in); | ||
| } | ||
|
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| /** | ||
| * Returns the aggregation function to be used in the first aggregation stage, | ||
| * which is grouped by `_tsid` (and `time_bucket`). | ||
| * | ||
| * @see org.elasticsearch.xpack.esql.optimizer.rules.logical.TranslateTimeSeriesAggregate | ||
| */ | ||
| public abstract AggregateFunction perTimeSeriesAggregation(); | ||
| } |
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Nit: add explanatory comment as the rest of the entries.