| <!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="Creates a view of a column transformed by a strictly monotonic mapping. See [`StrictlyMonotonicFn`]."><meta name="keywords" content="rust, rustlang, rust-lang, monotonic_map_column"><title>monotonic_map_column in fastfield_codecs - Rust</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="sidebar-items.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 fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../fastfield_codecs/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../fastfield_codecs/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2><a href="index.html">In fastfield_codecs</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">Function <a href="index.html">fastfield_codecs</a>::<wbr><a class="fn" href="#">monotonic_map_column</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="srclink" href="../src/fastfield_codecs/column.rs.html#174-189">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><pre class="rust fn"><code>pub fn monotonic_map_column<C, T, Input, Output>(<br> from_column: C,<br> monotonic_mapping: T<br>) -> impl <a class="trait" href="trait.Column.html" title="trait fastfield_codecs::Column">Column</a><Output><span class="where fmt-newline">where<br> C: <a class="trait" href="trait.Column.html" title="trait fastfield_codecs::Column">Column</a><Input>,<br> T: <a class="trait" href="trait.StrictlyMonotonicFn.html" title="trait fastfield_codecs::StrictlyMonotonicFn">StrictlyMonotonicFn</a><Input, Output> + Send + Sync,<br> Input: PartialOrd + Send + Sync + Copy + Debug,<br> Output: PartialOrd + Send + Sync + Copy + Debug,</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Creates a view of a column transformed by a strictly monotonic mapping. See |
| <a href="trait.StrictlyMonotonicFn.html" title="StrictlyMonotonicFn"><code>StrictlyMonotonicFn</code></a>.</p> |
| <p>E.g. apply a gcd monotonic_mapping([100, 200, 300]) == [1, 2, 3] |
| monotonic_mapping.mapping() is expected to be injective, and we should always have |
| monotonic_mapping.inverse(monotonic_mapping.mapping(el)) == el</p> |
| <p>The inverse of the mapping is required for: |
| <code>fn get_positions_for_value_range(&self, range: RangeInclusive<T>) -> Vec<u64> </code> |
| The user provides the original value range and we need to monotonic map them in the same way the |
| serialization does before calling the underlying column.</p> |
| <p>Note that when opening a codec, the monotonic_mapping should be the inverse of the mapping |
| during serialization. And therefore the monotonic_mapping_inv when opening is the same as |
| monotonic_mapping during serialization.</p> |
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