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Add avg_over_time #126572
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90 changes: 90 additions & 0 deletions
90
...src/main/java/org/elasticsearch/xpack/esql/expression/function/aggregate/AvgOverTime.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| /* | ||
| * 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 Avg}, but it is used to calculate the average value over a time series of values from the given field. | ||
| */ | ||
| public class AvgOverTime extends TimeSeriesAggregateFunction { | ||
| public static final NamedWriteableRegistry.Entry ENTRY = new NamedWriteableRegistry.Entry( | ||
| Expression.class, | ||
| "AvgOverTime", | ||
| AvgOverTime::new | ||
| ); | ||
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| @FunctionInfo(returnType = "double", description = "The average over time of a numeric field.", type = FunctionType.AGGREGATE) | ||
| public AvgOverTime( | ||
| Source source, | ||
| @Param( | ||
| name = "number", | ||
| type = { "double", "integer", "long" }, | ||
| description = "Expression that outputs values to average." | ||
| ) Expression field | ||
| ) { | ||
| this(source, field, Literal.TRUE); | ||
| } | ||
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| public AvgOverTime(Source source, Expression field, Expression filter) { | ||
| super(source, field, filter, emptyList()); | ||
| } | ||
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| private AvgOverTime(StreamInput in) throws IOException { | ||
| super(in); | ||
| } | ||
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| @Override | ||
| protected TypeResolution resolveType() { | ||
| return perTimeSeriesAggregation().resolveType(); | ||
| } | ||
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| @Override | ||
| public String getWriteableName() { | ||
| return ENTRY.name; | ||
| } | ||
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| @Override | ||
| public DataType dataType() { | ||
| return perTimeSeriesAggregation().dataType(); | ||
| } | ||
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| @Override | ||
| protected NodeInfo<AvgOverTime> info() { | ||
| return NodeInfo.create(this, AvgOverTime::new, field(), filter()); | ||
| } | ||
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| @Override | ||
| public AvgOverTime replaceChildren(List<Expression> newChildren) { | ||
| return new AvgOverTime(source(), newChildren.get(0), newChildren.get(1)); | ||
| } | ||
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| @Override | ||
| public AvgOverTime withFilter(Expression filter) { | ||
| return new AvgOverTime(source(), field(), filter); | ||
| } | ||
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| @Override | ||
| public AggregateFunction perTimeSeriesAggregation() { | ||
| return new Avg(source(), field(), filter()); | ||
| } | ||
| } |
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Nit: add ", that gets evaluated per time-series".
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++ see 24ee2d3