| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/git/checkouts/tantivy-65d0bbbddbbd5d02/433372d/src/aggregation/metric/stats.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>stats.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../../normalize.css"><link rel="stylesheet" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../../ayu.css" disabled><link rel="stylesheet" href="../../../../dark.css" disabled><link rel="stylesheet" href="../../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../../storage.js"></script><script defer src="../../../../source-script.js"></script><script defer src="../../../../source-files.js"></script><script defer src="../../../../main.js"></script><noscript><link rel="stylesheet" href="../../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../../tantivy/index.html"><div class="logo-container"> |
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| </pre><pre class="rust"><code><span class="kw">use </span>fastfield_codecs::Column; |
| <span class="kw">use </span>serde::{Deserialize, Serialize}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::aggregation::f64_from_fastfield_u64; |
| <span class="kw">use </span><span class="kw">crate</span>::schema::Type; |
| <span class="kw">use crate</span>::{DocId, TantivyError}; |
| |
| <span class="doccomment">/// A multi-value metric aggregation that computes stats of numeric values that are |
| /// extracted from the aggregated documents. |
| /// Supported field types are `u64`, `i64`, and `f64`. |
| /// See [`Stats`] for returned statistics. |
| /// |
| /// # JSON Format |
| /// ```json |
| /// { |
| /// "stats": { |
| /// "field": "score", |
| /// } |
| /// } |
| /// ``` |
| |
| </span><span class="attribute">#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)] |
| </span><span class="kw">pub struct </span>StatsAggregation { |
| <span class="doccomment">/// The field name to compute the stats on. |
| </span><span class="kw">pub </span>field: String, |
| } |
| |
| <span class="kw">impl </span>StatsAggregation { |
| <span class="doccomment">/// Create new StatsAggregation from a field. |
| </span><span class="kw">pub fn </span>from_field_name(field_name: String) -> <span class="self">Self </span>{ |
| StatsAggregation { field: field_name } |
| } |
| <span class="doccomment">/// Return the field name. |
| </span><span class="kw">pub fn </span>field_name(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str { |
| <span class="kw-2">&</span><span class="self">self</span>.field |
| } |
| } |
| |
| <span class="doccomment">/// Stats contains a collection of statistics. |
| </span><span class="attribute">#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)] |
| </span><span class="kw">pub struct </span>Stats { |
| <span class="doccomment">/// The number of documents. |
| </span><span class="kw">pub </span>count: usize, |
| <span class="doccomment">/// The sum of the fast field values. |
| </span><span class="kw">pub </span>sum: f64, |
| <span class="doccomment">/// The standard deviation of the fast field values. `None` for count == 0. |
| </span><span class="kw">pub </span>standard_deviation: <span class="prelude-ty">Option</span><f64>, |
| <span class="doccomment">/// The min value of the fast field values. |
| </span><span class="kw">pub </span>min: <span class="prelude-ty">Option</span><f64>, |
| <span class="doccomment">/// The max value of the fast field values. |
| </span><span class="kw">pub </span>max: <span class="prelude-ty">Option</span><f64>, |
| <span class="doccomment">/// The average of the values. `None` for count == 0. |
| </span><span class="kw">pub </span>avg: <span class="prelude-ty">Option</span><f64>, |
| } |
| |
| <span class="kw">impl </span>Stats { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>get_value(<span class="kw-2">&</span><span class="self">self</span>, agg_property: <span class="kw-2">&</span>str) -> <span class="kw">crate</span>::Result<<span class="prelude-ty">Option</span><f64>> { |
| <span class="kw">match </span>agg_property { |
| <span class="string">"count" </span>=> <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="self">self</span>.count <span class="kw">as </span>f64)), |
| <span class="string">"sum" </span>=> <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="self">self</span>.sum)), |
| <span class="string">"standard_deviation" </span>=> <span class="prelude-val">Ok</span>(<span class="self">self</span>.standard_deviation), |
| <span class="string">"min" </span>=> <span class="prelude-val">Ok</span>(<span class="self">self</span>.min), |
| <span class="string">"max" </span>=> <span class="prelude-val">Ok</span>(<span class="self">self</span>.max), |
| <span class="string">"avg" </span>=> <span class="prelude-val">Ok</span>(<span class="self">self</span>.avg), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(TantivyError::InvalidArgument(<span class="macro">format!</span>( |
| <span class="string">"unknown property {} on stats metric aggregation"</span>, |
| agg_property |
| ))), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// `IntermediateStats` contains the mergeable version for stats. |
| </span><span class="attribute">#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)] |
| </span><span class="kw">pub struct </span>IntermediateStats { |
| count: usize, |
| sum: f64, |
| squared_sum: f64, |
| min: f64, |
| max: f64, |
| } |
| <span class="kw">impl </span>Default <span class="kw">for </span>IntermediateStats { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| count: <span class="number">0</span>, |
| sum: <span class="number">0.0</span>, |
| squared_sum: <span class="number">0.0</span>, |
| min: f64::MAX, |
| max: f64::MIN, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>IntermediateStats { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>avg(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><f64> { |
| <span class="kw">if </span><span class="self">self</span>.count == <span class="number">0 </span>{ |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.sum / (<span class="self">self</span>.count <span class="kw">as </span>f64)) |
| } |
| } |
| |
| <span class="kw">fn </span>square_mean(<span class="kw-2">&</span><span class="self">self</span>) -> f64 { |
| <span class="self">self</span>.squared_sum / (<span class="self">self</span>.count <span class="kw">as </span>f64) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>standard_deviation(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><f64> { |
| <span class="self">self</span>.avg() |
| .map(|average| (<span class="self">self</span>.square_mean() - average * average).sqrt()) |
| } |
| |
| <span class="doccomment">/// Merge data from other stats into this instance. |
| </span><span class="kw">pub fn </span>merge_fruits(<span class="kw-2">&mut </span><span class="self">self</span>, other: IntermediateStats) { |
| <span class="self">self</span>.count += other.count; |
| <span class="self">self</span>.sum += other.sum; |
| <span class="self">self</span>.squared_sum += other.squared_sum; |
| <span class="self">self</span>.min = <span class="self">self</span>.min.min(other.min); |
| <span class="self">self</span>.max = <span class="self">self</span>.max.max(other.max); |
| } |
| |
| <span class="doccomment">/// compute final resultimprove_docs |
| </span><span class="kw">pub fn </span>finalize(<span class="kw-2">&</span><span class="self">self</span>) -> Stats { |
| <span class="kw">let </span>min = <span class="kw">if </span><span class="self">self</span>.count == <span class="number">0 </span>{ |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.min) |
| }; |
| <span class="kw">let </span>max = <span class="kw">if </span><span class="self">self</span>.count == <span class="number">0 </span>{ |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.max) |
| }; |
| Stats { |
| count: <span class="self">self</span>.count, |
| sum: <span class="self">self</span>.sum, |
| standard_deviation: <span class="self">self</span>.standard_deviation(), |
| min, |
| max, |
| avg: <span class="self">self</span>.avg(), |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>collect(<span class="kw-2">&mut </span><span class="self">self</span>, value: f64) { |
| <span class="self">self</span>.count += <span class="number">1</span>; |
| <span class="self">self</span>.sum += value; |
| <span class="self">self</span>.squared_sum += value * value; |
| <span class="self">self</span>.min = <span class="self">self</span>.min.min(value); |
| <span class="self">self</span>.max = <span class="self">self</span>.max.max(value); |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone, Debug, PartialEq)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>SegmentStatsCollector { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) stats: IntermediateStats, |
| field_type: Type, |
| } |
| |
| <span class="kw">impl </span>SegmentStatsCollector { |
| <span class="kw">pub fn </span>from_req(field_type: Type) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| field_type, |
| stats: IntermediateStats::default(), |
| } |
| } |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>collect_block(<span class="kw-2">&mut </span><span class="self">self</span>, doc: <span class="kw-2">&</span>[DocId], field: <span class="kw-2">&</span><span class="kw">dyn </span>Column<u64>) { |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = doc.chunks_exact(<span class="number">4</span>); |
| <span class="kw">for </span>docs <span class="kw">in </span>iter.by_ref() { |
| <span class="kw">let </span>val1 = field.get_val(docs[<span class="number">0</span>]); |
| <span class="kw">let </span>val2 = field.get_val(docs[<span class="number">1</span>]); |
| <span class="kw">let </span>val3 = field.get_val(docs[<span class="number">2</span>]); |
| <span class="kw">let </span>val4 = field.get_val(docs[<span class="number">3</span>]); |
| <span class="kw">let </span>val1 = f64_from_fastfield_u64(val1, <span class="kw-2">&</span><span class="self">self</span>.field_type); |
| <span class="kw">let </span>val2 = f64_from_fastfield_u64(val2, <span class="kw-2">&</span><span class="self">self</span>.field_type); |
| <span class="kw">let </span>val3 = f64_from_fastfield_u64(val3, <span class="kw-2">&</span><span class="self">self</span>.field_type); |
| <span class="kw">let </span>val4 = f64_from_fastfield_u64(val4, <span class="kw-2">&</span><span class="self">self</span>.field_type); |
| <span class="self">self</span>.stats.collect(val1); |
| <span class="self">self</span>.stats.collect(val2); |
| <span class="self">self</span>.stats.collect(val3); |
| <span class="self">self</span>.stats.collect(val4); |
| } |
| <span class="kw">for </span><span class="kw-2">&</span>doc <span class="kw">in </span>iter.remainder() { |
| <span class="kw">let </span>val = field.get_val(doc); |
| <span class="kw">let </span>val = f64_from_fastfield_u64(val, <span class="kw-2">&</span><span class="self">self</span>.field_type); |
| <span class="self">self</span>.stats.collect(val); |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| |
| <span class="kw">use </span>std::iter; |
| |
| <span class="kw">use </span>serde_json::Value; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::aggregation::agg_req::{ |
| Aggregation, Aggregations, BucketAggregation, BucketAggregationType, MetricAggregation, |
| RangeAggregation, |
| }; |
| <span class="kw">use </span><span class="kw">crate</span>::aggregation::agg_result::AggregationResults; |
| <span class="kw">use </span><span class="kw">crate</span>::aggregation::metric::StatsAggregation; |
| <span class="kw">use </span><span class="kw">crate</span>::aggregation::tests::{get_test_index_2_segments, get_test_index_from_values}; |
| <span class="kw">use </span><span class="kw">crate</span>::aggregation::AggregationCollector; |
| <span class="kw">use </span><span class="kw">crate</span>::query::{AllQuery, TermQuery}; |
| <span class="kw">use </span><span class="kw">crate</span>::schema::IndexRecordOption; |
| <span class="kw">use </span><span class="kw">crate</span>::Term; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_aggregation_stats_empty_index() -> <span class="kw">crate</span>::Result<()> { |
| <span class="comment">// test index without segments |
| </span><span class="kw">let </span>values = <span class="macro">vec!</span>[]; |
| |
| <span class="kw">let </span>index = get_test_index_from_values(<span class="bool-val">false</span>, <span class="kw-2">&</span>values)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>agg_req_1: Aggregations = <span class="macro">vec!</span>[( |
| <span class="string">"stats"</span>.to_string(), |
| Aggregation::Metric(MetricAggregation::Stats(StatsAggregation::from_field_name( |
| <span class="string">"score"</span>.to_string(), |
| ))), |
| )] |
| .into_iter() |
| .collect(); |
| |
| <span class="kw">let </span>collector = AggregationCollector::from_aggs(agg_req_1, <span class="prelude-val">None</span>, index.schema()); |
| |
| <span class="kw">let </span>reader = index.reader()<span class="question-mark">?</span>; |
| <span class="kw">let </span>searcher = reader.searcher(); |
| <span class="kw">let </span>agg_res: AggregationResults = searcher.search(<span class="kw-2">&</span>AllQuery, <span class="kw-2">&</span>collector).unwrap(); |
| |
| <span class="kw">let </span>res: Value = serde_json::from_str(<span class="kw-2">&</span>serde_json::to_string(<span class="kw-2">&</span>agg_res)<span class="question-mark">?</span>)<span class="question-mark">?</span>; |
| <span class="macro">assert_eq!</span>( |
| res[<span class="string">"stats"</span>], |
| <span class="macro">json!</span>({ |
| <span class="string">"avg"</span>: Value::Null, |
| <span class="string">"count"</span>: <span class="number">0</span>, |
| <span class="string">"max"</span>: Value::Null, |
| <span class="string">"min"</span>: Value::Null, |
| <span class="string">"standard_deviation"</span>: Value::Null, |
| <span class="string">"sum"</span>: <span class="number">0.0 |
| </span>}) |
| ); |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_aggregation_stats() -> <span class="kw">crate</span>::Result<()> { |
| <span class="kw">let </span>index = get_test_index_2_segments(<span class="bool-val">false</span>)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>reader = index.reader()<span class="question-mark">?</span>; |
| <span class="kw">let </span>text_field = reader.searcher().schema().get_field(<span class="string">"text"</span>).unwrap(); |
| |
| <span class="kw">let </span>term_query = TermQuery::new( |
| Term::from_field_text(text_field, <span class="string">"cool"</span>), |
| IndexRecordOption::Basic, |
| ); |
| |
| <span class="kw">let </span>agg_req_1: Aggregations = <span class="macro">vec!</span>[ |
| ( |
| <span class="string">"stats_i64"</span>.to_string(), |
| Aggregation::Metric(MetricAggregation::Stats(StatsAggregation::from_field_name( |
| <span class="string">"score_i64"</span>.to_string(), |
| ))), |
| ), |
| ( |
| <span class="string">"stats_f64"</span>.to_string(), |
| Aggregation::Metric(MetricAggregation::Stats(StatsAggregation::from_field_name( |
| <span class="string">"score_f64"</span>.to_string(), |
| ))), |
| ), |
| ( |
| <span class="string">"stats"</span>.to_string(), |
| Aggregation::Metric(MetricAggregation::Stats(StatsAggregation::from_field_name( |
| <span class="string">"score"</span>.to_string(), |
| ))), |
| ), |
| ( |
| <span class="string">"range"</span>.to_string(), |
| Aggregation::Bucket(BucketAggregation { |
| bucket_agg: BucketAggregationType::Range(RangeAggregation { |
| field: <span class="string">"score"</span>.to_string(), |
| ranges: <span class="macro">vec!</span>[ |
| (<span class="number">3f64</span>..<span class="number">7f64</span>).into(), |
| (<span class="number">7f64</span>..<span class="number">19f64</span>).into(), |
| (<span class="number">19f64</span>..<span class="number">20f64</span>).into(), |
| ], |
| ..Default::default() |
| }), |
| sub_aggregation: iter::once(( |
| <span class="string">"stats"</span>.to_string(), |
| Aggregation::Metric(MetricAggregation::Stats( |
| StatsAggregation::from_field_name(<span class="string">"score"</span>.to_string()), |
| )), |
| )) |
| .collect(), |
| }), |
| ), |
| ] |
| .into_iter() |
| .collect(); |
| |
| <span class="kw">let </span>collector = AggregationCollector::from_aggs(agg_req_1, <span class="prelude-val">None</span>, index.schema()); |
| |
| <span class="kw">let </span>searcher = reader.searcher(); |
| <span class="kw">let </span>agg_res: AggregationResults = searcher.search(<span class="kw-2">&</span>term_query, <span class="kw-2">&</span>collector).unwrap(); |
| |
| <span class="kw">let </span>res: Value = serde_json::from_str(<span class="kw-2">&</span>serde_json::to_string(<span class="kw-2">&</span>agg_res)<span class="question-mark">?</span>)<span class="question-mark">?</span>; |
| <span class="macro">assert_eq!</span>( |
| res[<span class="string">"stats"</span>], |
| <span class="macro">json!</span>({ |
| <span class="string">"avg"</span>: <span class="number">12.142857142857142</span>, |
| <span class="string">"count"</span>: <span class="number">7</span>, |
| <span class="string">"max"</span>: <span class="number">44.0</span>, |
| <span class="string">"min"</span>: <span class="number">1.0</span>, |
| <span class="string">"standard_deviation"</span>: <span class="number">13.65313748796613</span>, |
| <span class="string">"sum"</span>: <span class="number">85.0 |
| </span>}) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| res[<span class="string">"stats_i64"</span>], |
| <span class="macro">json!</span>({ |
| <span class="string">"avg"</span>: <span class="number">12.142857142857142</span>, |
| <span class="string">"count"</span>: <span class="number">7</span>, |
| <span class="string">"max"</span>: <span class="number">44.0</span>, |
| <span class="string">"min"</span>: <span class="number">1.0</span>, |
| <span class="string">"standard_deviation"</span>: <span class="number">13.65313748796613</span>, |
| <span class="string">"sum"</span>: <span class="number">85.0 |
| </span>}) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| res[<span class="string">"stats_f64"</span>], |
| <span class="macro">json!</span>({ |
| <span class="string">"avg"</span>: <span class="number">12.214285714285714</span>, |
| <span class="string">"count"</span>: <span class="number">7</span>, |
| <span class="string">"max"</span>: <span class="number">44.5</span>, |
| <span class="string">"min"</span>: <span class="number">1.0</span>, |
| <span class="string">"standard_deviation"</span>: <span class="number">13.819905785437443</span>, |
| <span class="string">"sum"</span>: <span class="number">85.5 |
| </span>}) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| res[<span class="string">"range"</span>][<span class="string">"buckets"</span>][<span class="number">2</span>][<span class="string">"stats"</span>], |
| <span class="macro">json!</span>({ |
| <span class="string">"avg"</span>: <span class="number">10.666666666666666</span>, |
| <span class="string">"count"</span>: <span class="number">3</span>, |
| <span class="string">"max"</span>: <span class="number">14.0</span>, |
| <span class="string">"min"</span>: <span class="number">7.0</span>, |
| <span class="string">"standard_deviation"</span>: <span class="number">2.867441755680877</span>, |
| <span class="string">"sum"</span>: <span class="number">32.0 |
| </span>}) |
| ); |
| |
| <span class="macro">assert_eq!</span>( |
| res[<span class="string">"range"</span>][<span class="string">"buckets"</span>][<span class="number">3</span>][<span class="string">"stats"</span>], |
| <span class="macro">json!</span>({ |
| <span class="string">"avg"</span>: serde_json::Value::Null, |
| <span class="string">"count"</span>: <span class="number">0</span>, |
| <span class="string">"max"</span>: serde_json::Value::Null, |
| <span class="string">"min"</span>: serde_json::Value::Null, |
| <span class="string">"standard_deviation"</span>: serde_json::Value::Null, |
| <span class="string">"sum"</span>: <span class="number">0.0</span>, |
| }) |
| ); |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="tantivy" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |