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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="Datafusion optimizer for flow plan"><title>flow::df_optimizer - 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-e56847b5.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="1.92.0-nightly (fa3155a64 2025-09-30)" data-channel="nightly" data-search-js="search-e256b49e.js" data-stringdex-js="stringdex-828709d0.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-ce535bd0.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.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 mod"><!--[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="#">Module df_optimizer</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-beta.3</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module df_<wbr>optimizer</a></h2><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#functions" title="Functions">Functions</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="../index.html">In crate flow</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"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../index.html">flow</a></div><h1>Module <span>df_<wbr>optimizer</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/df_optimizer.rs.html#15-593">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Datafusion optimizer for flow plan</p>
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</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><dl class="item-table"><dt><a class="struct" href="struct.AvgExpandRule.html" title="struct flow::df_optimizer::AvgExpandRule">AvgExpand<wbr>Rule</a><span title="Restricted Visibility"> 🔒</span> </dt><dt><a class="struct" href="struct.CheckGroupByRule.html" title="struct flow::df_optimizer::CheckGroupByRule">Check<wbr>Group<wbr>ByRule</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>This rule check all group by exprs, and make sure they are also in select clause in a aggr query</dd><dt><a class="struct" href="struct.ExpandAvgRewriter.html" title="struct flow::df_optimizer::ExpandAvgRewriter">Expand<wbr>AvgRewriter</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>rewrite <code>avg(<expr>)</code> function into <code>CASE WHEN count(<expr>) !=0 THEN cast(sum((<expr>) AS avg_return_type)/count((<expr>) ELSE 0</code></dd><dt><a class="struct" href="struct.FindColumn.html" title="struct flow::df_optimizer::FindColumn">Find<wbr>Column</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>Find all column names in a plan</dd><dt><a class="struct" href="struct.TumbleExpand.html" title="struct flow::df_optimizer::TumbleExpand">Tumble<wbr>Expand</a></dt><dd>This is a placeholder for tumble_start and tumble_end function, so that datafusion can
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recognize them as scalar function</dd><dt><a class="struct" href="struct.TumbleExpandRule.html" title="struct flow::df_optimizer::TumbleExpandRule">Tumble<wbr>Expand<wbr>Rule</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>expand tumble in aggr expr to tumble_start and tumble_end with column name like <code>window_start</code></dd></dl><h2 id="functions" class="section-header">Functions<a href="#functions" class="anchor">§</a></h2><dl class="item-table"><dt><a class="fn" href="fn.apply_df_optimizer.html" title="fn flow::df_optimizer::apply_df_optimizer">apply_<wbr>df_<wbr>optimizer</a></dt><dt><a class="fn" href="fn.check_group_by_analyzer.html" title="fn flow::df_optimizer::check_group_by_analyzer">check_<wbr>group_<wbr>by_<wbr>analyzer</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>make sure everything in group by’s expr is in select</dd><dt><a class="fn" href="fn.expand_avg_analyzer.html" title="fn flow::df_optimizer::expand_avg_analyzer">expand_<wbr>avg_<wbr>analyzer</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>expand <code>avg(<expr>)</code> function into <code>cast(sum((<expr>) AS f64)/count((<expr>)</code></dd><dt><a class="fn" href="fn.expand_tumble_analyzer.html" title="fn flow::df_optimizer::expand_tumble_analyzer">expand_<wbr>tumble_<wbr>analyzer</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>expand <code>tumble</code> in aggr expr to <code>tumble_start</code> and <code>tumble_end</code>, also expand related alias and column ref</dd><dt><a class="fn" href="fn.put_aggr_to_proj_analyzer.html" title="fn flow::df_optimizer::put_aggr_to_proj_analyzer">put_<wbr>aggr_<wbr>to_<wbr>proj_<wbr>analyzer</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>lift aggr’s composite aggr_expr to outer proj, and leave aggr only with simple direct aggr expr
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i.e.</dd><dt><a class="fn" href="fn.sql_to_flow_plan.html" title="fn flow::df_optimizer::sql_to_flow_plan">sql_<wbr>to_<wbr>flow_<wbr>plan</a></dt><dd>To reuse existing code for parse sql, the sql is first parsed into a datafusion logical plan,
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then to a substrait plan, and finally to a flow plan.</dd></dl></section></div></main></body></html> |