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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="A visitor that can be used to walk an AST tree."><title>Visitor in sql::ast - 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="sql" 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 trait"><!--[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="#">Visitor</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../sql/index.html">sql</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="#">Visitor</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#see-also" title="See also">See also</a></li><li><a href="#example" title="Example">Example</a></li></ul><h3><a href="#required-associated-types">Required Associated Types</a></h3><ul class="block"><li><a href="#associatedtype.Break" title="Break">Break</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.post_visit_expr" title="post_visit_expr">post_visit_expr</a></li><li><a href="#method.post_visit_query" title="post_visit_query">post_visit_query</a></li><li><a href="#method.post_visit_relation" title="post_visit_relation">post_visit_relation</a></li><li><a href="#method.post_visit_statement" title="post_visit_statement">post_visit_statement</a></li><li><a href="#method.post_visit_table_factor" title="post_visit_table_factor">post_visit_table_factor</a></li><li><a href="#method.post_visit_value" title="post_visit_value">post_visit_value</a></li><li><a href="#method.pre_visit_expr" title="pre_visit_expr">pre_visit_expr</a></li><li><a href="#method.pre_visit_query" title="pre_visit_query">pre_visit_query</a></li><li><a href="#method.pre_visit_relation" title="pre_visit_relation">pre_visit_relation</a></li><li><a href="#method.pre_visit_statement" title="pre_visit_statement">pre_visit_statement</a></li><li><a href="#method.pre_visit_table_factor" title="pre_visit_table_factor">pre_visit_table_factor</a></li><li><a href="#method.pre_visit_value" title="pre_visit_value">pre_visit_value</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In sql::<wbr>ast</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">sql</a>::<wbr><a href="index.html">ast</a></div><h1>Trait <span class="trait">Visitor</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"></span></div><pre class="rust item-decl"><code>pub trait Visitor {
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type <a href="#associatedtype.Break" class="associatedtype">Break</a>;
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// Provided methods
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fn <a href="#method.pre_visit_query" class="fn">pre_visit_query</a>(&mut self, _query: &Query) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.post_visit_query" class="fn">post_visit_query</a>(&mut self, _query: &Query) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.pre_visit_relation" class="fn">pre_visit_relation</a>(
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&mut self,
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_relation: &<a class="struct" href="struct.ObjectName.html" title="struct sql::ast::ObjectName">ObjectName</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.post_visit_relation" class="fn">post_visit_relation</a>(
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&mut self,
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_relation: &<a class="struct" href="struct.ObjectName.html" title="struct sql::ast::ObjectName">ObjectName</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.pre_visit_table_factor" class="fn">pre_visit_table_factor</a>(
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&mut self,
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_table_factor: &TableFactor,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.post_visit_table_factor" class="fn">post_visit_table_factor</a>(
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&mut self,
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_table_factor: &TableFactor,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.pre_visit_expr" class="fn">pre_visit_expr</a>(&mut self, _expr: &<a class="enum" href="enum.Expr.html" title="enum sql::ast::Expr">Expr</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.post_visit_expr" class="fn">post_visit_expr</a>(&mut self, _expr: &<a class="enum" href="enum.Expr.html" title="enum sql::ast::Expr">Expr</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.pre_visit_statement" class="fn">pre_visit_statement</a>(
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&mut self,
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_statement: &Statement,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.post_visit_statement" class="fn">post_visit_statement</a>(
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&mut self,
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_statement: &Statement,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.pre_visit_value" class="fn">pre_visit_value</a>(&mut self, _value: &<a class="enum" href="enum.Value.html" title="enum sql::ast::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.post_visit_value" class="fn">post_visit_value</a>(&mut self, _value: &<a class="enum" href="enum.Value.html" title="enum sql::ast::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</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>A visitor that can be used to walk an AST tree.</p>
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<p><code>pre_visit_</code> methods are invoked before visiting all children of the
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node and <code>post_visit_</code> methods are invoked after visiting all
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children of the node.</p>
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<h2 id="see-also"><a class="doc-anchor" href="#see-also">§</a>See also</h2>
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<p>These methods provide a more concise way of visiting nodes of a certain type:</p>
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<ul>
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<li>[visit_relations]</li>
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<li>[visit_expressions]</li>
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<li>[visit_statements]</li>
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</ul>
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<h2 id="example"><a class="doc-anchor" href="#example">§</a>Example</h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="comment">// A structure that records statements and relations
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</span><span class="attr">#[derive(Default)]
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</span><span class="kw">struct </span>V {
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visited: Vec<String>,
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}
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<span class="comment">// Visit relations and exprs before children are visited (depth first walk)
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// Note you can also visit statements and visit exprs after children have been visited
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</span><span class="kw">impl </span>Visitor <span class="kw">for </span>V {
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<span class="kw">type </span>Break = ();
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<span class="kw">fn </span>pre_visit_relation(<span class="kw-2">&mut </span><span class="self">self</span>, relation: <span class="kw-2">&</span>ObjectName) -> ControlFlow<<span class="self">Self</span>::Break> {
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<span class="self">self</span>.visited.push(<span class="macro">format!</span>(<span class="string">"PRE: RELATION: {}"</span>, relation));
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ControlFlow::Continue(())
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}
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<span class="kw">fn </span>pre_visit_expr(<span class="kw-2">&mut </span><span class="self">self</span>, expr: <span class="kw-2">&</span>Expr) -> ControlFlow<<span class="self">Self</span>::Break> {
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<span class="self">self</span>.visited.push(<span class="macro">format!</span>(<span class="string">"PRE: EXPR: {}"</span>, expr));
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ControlFlow::Continue(())
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}
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}
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<span class="kw">let </span>sql = <span class="string">"SELECT a FROM foo where x IN (SELECT y FROM bar)"</span>;
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<span class="kw">let </span>statements = Parser::parse_sql(<span class="kw-2">&</span>GenericDialect{}, sql)
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.unwrap();
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<span class="comment">// Drive the visitor through the AST
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</span><span class="kw">let </span><span class="kw-2">mut </span>visitor = V::default();
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statements.visit(<span class="kw-2">&mut </span>visitor);
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<span class="comment">// The visitor has visited statements and expressions in pre-traversal order
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</span><span class="kw">let </span>expected : Vec<<span class="kw">_</span>> = [
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<span class="string">"PRE: EXPR: a"</span>,
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<span class="string">"PRE: RELATION: foo"</span>,
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<span class="string">"PRE: EXPR: x IN (SELECT y FROM bar)"</span>,
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<span class="string">"PRE: EXPR: x"</span>,
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<span class="string">"PRE: EXPR: y"</span>,
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<span class="string">"PRE: RELATION: bar"</span>,
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]
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.into_iter().map(|s| s.to_string()).collect();
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<span class="macro">assert_eq!</span>(visitor.visited, expected);</code></pre></div></div></details><h2 id="required-associated-types" class="section-header">Required Associated Types<a href="#required-associated-types" class="anchor">§</a></h2><div class="methods"><details class="toggle" open><summary><section id="associatedtype.Break" class="method"><h4 class="code-header">type <a href="#associatedtype.Break" class="associatedtype">Break</a></h4></section></summary><div class="docblock"><p>Type returned when the recursion returns early.</p>
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</div></details></div><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="method.pre_visit_query" class="method"><h4 class="code-header">fn <a href="#method.pre_visit_query" class="fn">pre_visit_query</a>(&mut self, _query: &Query) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>></h4></section></summary><div class="docblock"><p>Invoked for any queries that appear in the AST before visiting children</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.post_visit_query" class="method"><h4 class="code-header">fn <a href="#method.post_visit_query" class="fn">post_visit_query</a>(&mut self, _query: &Query) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>></h4></section></summary><div class="docblock"><p>Invoked for any queries that appear in the AST after visiting children</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.pre_visit_relation" class="method"><h4 class="code-header">fn <a href="#method.pre_visit_relation" class="fn">pre_visit_relation</a>(
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&mut self,
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_relation: &<a class="struct" href="struct.ObjectName.html" title="struct sql::ast::ObjectName">ObjectName</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>></h4></section></summary><div class="docblock"><p>Invoked for any relations (e.g. tables) that appear in the AST before visiting children</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.post_visit_relation" class="method"><h4 class="code-header">fn <a href="#method.post_visit_relation" class="fn">post_visit_relation</a>(
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&mut self,
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_relation: &<a class="struct" href="struct.ObjectName.html" title="struct sql::ast::ObjectName">ObjectName</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>></h4></section></summary><div class="docblock"><p>Invoked for any relations (e.g. tables) that appear in the AST after visiting children</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.pre_visit_table_factor" class="method"><h4 class="code-header">fn <a href="#method.pre_visit_table_factor" class="fn">pre_visit_table_factor</a>(
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&mut self,
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_table_factor: &TableFactor,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>></h4></section></summary><div class="docblock"><p>Invoked for any table factors that appear in the AST before visiting children</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.post_visit_table_factor" class="method"><h4 class="code-header">fn <a href="#method.post_visit_table_factor" class="fn">post_visit_table_factor</a>(
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&mut self,
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_table_factor: &TableFactor,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>></h4></section></summary><div class="docblock"><p>Invoked for any table factors that appear in the AST after visiting children</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.pre_visit_expr" class="method"><h4 class="code-header">fn <a href="#method.pre_visit_expr" class="fn">pre_visit_expr</a>(&mut self, _expr: &<a class="enum" href="enum.Expr.html" title="enum sql::ast::Expr">Expr</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>></h4></section></summary><div class="docblock"><p>Invoked for any expressions that appear in the AST before visiting children</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.post_visit_expr" class="method"><h4 class="code-header">fn <a href="#method.post_visit_expr" class="fn">post_visit_expr</a>(&mut self, _expr: &<a class="enum" href="enum.Expr.html" title="enum sql::ast::Expr">Expr</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>></h4></section></summary><div class="docblock"><p>Invoked for any expressions that appear in the AST</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.pre_visit_statement" class="method"><h4 class="code-header">fn <a href="#method.pre_visit_statement" class="fn">pre_visit_statement</a>(
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&mut self,
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_statement: &Statement,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>></h4></section></summary><div class="docblock"><p>Invoked for any statements that appear in the AST before visiting children</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.post_visit_statement" class="method"><h4 class="code-header">fn <a href="#method.post_visit_statement" class="fn">post_visit_statement</a>(
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&mut self,
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_statement: &Statement,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>></h4></section></summary><div class="docblock"><p>Invoked for any statements that appear in the AST after visiting children</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.pre_visit_value" class="method"><h4 class="code-header">fn <a href="#method.pre_visit_value" class="fn">pre_visit_value</a>(&mut self, _value: &<a class="enum" href="enum.Value.html" title="enum sql::ast::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>></h4></section></summary><div class="docblock"><p>Invoked for any Value that appear in the AST before visiting children</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.post_visit_value" class="method"><h4 class="code-header">fn <a href="#method.post_visit_value" class="fn">post_visit_value</a>(&mut self, _value: &<a class="enum" href="enum.Value.html" title="enum sql::ast::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/ops/control_flow/enum.ControlFlow.html" title="enum core::ops::control_flow::ControlFlow">ControlFlow</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Break" title="type sql::ast::Visitor::Break">Break</a>></h4></section></summary><div class="docblock"><p>Invoked for any Value that appear in the AST after visiting children</p>
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</div></details></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../../trait.impl/sqlparser/ast/visitor/trait.Visitor.js" async></script></section></div></main></body></html> |