mentat/mentat_query_projector/fn.query_projection.html
2018-08-22 17:04:13 +00:00

137 lines
No EOL
6 KiB
HTML
Raw Permalink Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

<!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="API documentation for the Rust `query_projection` fn in crate `mentat_query_projector`.">
<meta name="keywords" content="rust, rustlang, rust-lang, query_projection">
<title>mentat_query_projector::query_projection - Rust</title>
<link rel="stylesheet" type="text/css" href="../normalize.css">
<link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle">
<link rel="stylesheet" type="text/css" href="../dark.css">
<link rel="stylesheet" type="text/css" href="../main.css" id="themeStyle">
<script src="../storage.js"></script>
</head>
<body class="rustdoc fn">
<!--[if lte IE 8]>
<div class="warning">
This old browser is unsupported and will most likely display funky
things.
</div>
<![endif]-->
<nav class="sidebar">
<div class="sidebar-menu">&#9776;</div>
<p class='location'><a href='index.html'>mentat_query_projector</a></p><script>window.sidebarCurrent = {name: 'query_projection', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script>
</nav>
<div class="theme-picker">
<button id="theme-picker" aria-label="Pick another theme!">
<img src="../brush.svg" width="18" alt="Pick another theme!">
</button>
<div id="theme-choices"></div>
</div>
<script src="../theme.js"></script>
<nav class="sub">
<form class="search-form js-only">
<div class="search-container">
<input class="search-input" name="search"
autocomplete="off"
placeholder="Click or press S to search, ? for more options…"
type="search">
</div>
</form>
</nav>
<section id='main' class="content">
<h1 class='fqn'><span class='in-band'>Function <a href='index.html'>mentat_query_projector</a>::<wbr><a class="fn" href=''>query_projection</a></span><span class='out-of-band'><span id='render-detail'>
<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
[<span class='inner'>&#x2212;</span>]
</a>
</span><a class='srclink' href='../src/mentat_query_projector/lib.rs.html#448-526' title='goto source code'>[src]</a></span></h1>
<pre class='rust fn'>pub fn query_projection(<br>&nbsp;&nbsp;&nbsp;&nbsp;schema: &amp;<a class="struct" href="../mentat_core/struct.Schema.html" title="struct mentat_core::Schema">Schema</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;query: &amp;<a class="struct" href="../mentat_query_algebrizer/struct.AlgebraicQuery.html" title="struct mentat_query_algebrizer::AlgebraicQuery">AlgebraicQuery</a><br>) -&gt; <a class="type" href="../query_projector_traits/errors/type.Result.html" title="type query_projector_traits::errors::Result">Result</a>&lt;<a class="enum" href="../mentat_core/util/enum.Either.html" title="enum mentat_core::util::Either">Either</a>&lt;<a class="struct" href="../mentat_query_projector/struct.ConstantProjector.html" title="struct mentat_query_projector::ConstantProjector">ConstantProjector</a>, <a class="struct" href="../mentat_query_projector/struct.CombinedProjection.html" title="struct mentat_query_projector::CombinedProjection">CombinedProjection</a>&gt;&gt;</pre><div class='docblock'><p>Compute a suitable SQL projection for an algebrized query.
This takes into account a number of things:</p>
<ul>
<li>The variable list in the find spec.</li>
<li>The presence of any aggregate operations in the find spec. TODO: for now we only handle
simple variables</li>
<li>The bindings established by the topmost CC.</li>
<li>The types known at algebrizing time.</li>
<li>The types extracted from the store for unknown attributes.</li>
</ul>
</div></section>
<section id='search' class="content hidden"></section>
<section class="footer"></section>
<aside id="help" class="hidden">
<div>
<h1 class="hidden">Help</h1>
<div class="shortcuts">
<h2>Keyboard Shortcuts</h2>
<dl>
<dt><kbd>?</kbd></dt>
<dd>Show this help dialog</dd>
<dt><kbd>S</kbd></dt>
<dd>Focus the search field</dd>
<dt><kbd></kbd></dt>
<dd>Move up in search results</dd>
<dt><kbd></kbd></dt>
<dd>Move down in search results</dd>
<dt><kbd></kbd></dt>
<dd>Switch tab</dd>
<dt><kbd>&#9166;</kbd></dt>
<dd>Go to active search result</dd>
<dt><kbd>+</kbd></dt>
<dd>Expand all sections</dd>
<dt><kbd>-</kbd></dt>
<dd>Collapse all sections</dd>
</dl>
</div>
<div class="infos">
<h2>Search Tricks</h2>
<p>
Prefix searches with a type followed by a colon (e.g.
<code>fn:</code>) to restrict the search to a given type.
</p>
<p>
Accepted types are: <code>fn</code>, <code>mod</code>,
<code>struct</code>, <code>enum</code>,
<code>trait</code>, <code>type</code>, <code>macro</code>,
and <code>const</code>.
</p>
<p>
Search functions by type signature (e.g.
<code>vec -> usize</code> or <code>* -> vec</code>)
</p>
</div>
</div>
</aside>
<script>
window.rootPath = "../";
window.currentCrate = "mentat_query_projector";
</script>
<script src="../main.js"></script>
<script defer src="../search-index.js"></script>
</body>
</html>