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<!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="eval accumulable reduce plan by eval aggregate function and reduce the result"><title>reduce_accum_subgraph in flow::compute::render::reduce - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../../static.files/rustdoc-17e0aaed.css"><meta name="rustdoc-vars" data-root-path="../../../../" data-static-root-path="../../../../static.files/" data-current-crate="flow" data-themes="" data-resource-suffix="" data-rustdoc-version="1.96.0-nightly (ac7f9ec7d 2026-03-20)" data-channel="nightly" data-search-js="search-63369b7b.js" data-stringdex-js="stringdex-2da4960a.js" data-settings-js="settings-170eb4bf.js" ><script src="../../../../static.files/storage-41dd4d93.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../../static.files/main-5013f961.js"></script><noscript><link rel="stylesheet" href="../../../../static.files/noscript-f7c3ffd8.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../../static.files/favicon-044be391.svg"></head><body class="rustdoc fn"><a class="skip-main-content" href="#main-content">Skip to main content</a><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">reduce_accum_subgraph</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../../flow/index.html">flow</a><span class="version">1.0.0</span></h2></div><div class="sidebar-elems"><div id="rustdoc-modnav"><h2><a href="index.html">In flow::<wbr>compute::<wbr>render::<wbr>reduce</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../../../index.html">flow</a>::<wbr><a href="../../index.html">compute</a>::<wbr><a href="../index.html">render</a>::<wbr><a href="index.html">reduce</a></div><h1>Function <span class="fn">reduce_<wbr>accum_<wbr>subgraph</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../../src/flow/compute/render/reduce.rs.html#812-946">Source</a> </span></div><pre class="rust item-decl"><code>fn reduce_accum_subgraph(
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arrange: &<a class="struct" href="../../../utils/struct.ArrangeHandler.html" title="struct flow::utils::ArrangeHandler">ArrangeHandler</a>,
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distinct_input: &<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="struct" href="../../../utils/struct.ArrangeHandler.html" title="struct flow::utils::ArrangeHandler">ArrangeHandler</a>>>,
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kv: impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a><Item = ((<a class="struct" href="../../../repr/struct.Row.html" title="struct flow::repr::Row">Row</a>, <a class="struct" href="../../../repr/struct.Row.html" title="struct flow::repr::Row">Row</a>), <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a>)>,
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accum_plan: &<a class="struct" href="../../../plan/reduce/struct.AccumulablePlan.html" title="struct flow::plan::reduce::AccumulablePlan">AccumulablePlan</a>,
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_: <a class="struct" href="../struct.SubgraphArg.html" title="struct flow::compute::render::SubgraphArg">SubgraphArg</a><'_>,
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)</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>eval accumulable reduce plan by eval aggregate function and reduce the result</p>
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<p>TODO(discord9): eval distinct by adding distinct input arrangement</p>
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<p>invariant: it’is assumed <code>kv</code>’s time is always <= now,
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since it’s from a Collection Bundle, where future inserts are stored in arrange</p>
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<p>the data being send is just new rows that represent the new output after given input is processed</p>
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<p>i.e: for example before new updates comes in, the output of query <code>SELECT sum(number), count(number) FROM table</code>
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is (10,2(), and after new updates comes in, the output is (15,3), then the new row being send is ((15, 3), now, 1)</p>
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<p>while it will also update key -> accums’s value, for example if it is empty before, it will become something like
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|offset| accum for sum | accum for count |
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where offset is a single value holding the end offset of each accumulator
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and the rest is the actual accumulator values which could be multiple values</p>
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</div></details></section></div></main></body></html> |