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<p class='location'>Enum FindSpec</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#variants">Variants</a><div class="sidebar-links"><a href="#variant.FindRel">FindRel</a><a href="#variant.FindColl">FindColl</a><a href="#variant.FindTuple">FindTuple</a><a href="#variant.FindScalar">FindScalar</a></div><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.is_unit_limited">is_unit_limited</a><a href="#method.expected_column_count">expected_column_count</a><a href="#method.requires_distinct">requires_distinct</a><a href="#method.columns">columns</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Eq">Eq</a><a href="#impl-PartialEq%3CFindSpec%3E">PartialEq<FindSpec></a><a href="#impl-Debug">Debug</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</a></div></div><p class='location'><a href='index.html'>mentat_ffi</a></p><script>window.sidebarCurrent = {name: 'FindSpec', ty: 'enum', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Enum <a href='index.html'>mentat_ffi</a>::<wbr><a class="enum" href=''>FindSpec</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/edn/query.rs.html#654-670' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust enum'>pub enum FindSpec {
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FindRel(<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="enum" href="../edn/query/enum.Element.html" title="enum edn::query::Element">Element</a>>),
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FindColl(<a class="enum" href="../edn/query/enum.Element.html" title="enum edn::query::Element">Element</a>),
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FindTuple(<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="enum" href="../edn/query/enum.Element.html" title="enum edn::query::Element">Element</a>>),
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FindScalar(<a class="enum" href="../edn/query/enum.Element.html" title="enum edn::query::Element">Element</a>),
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}</pre></div><div class='docblock'><p>A definition of the first part of a find query: the
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<code>[:find ?foo ?bar…]</code> bit.</p>
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<p>There are four different kinds of find specs, allowing you to query for
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a single value, a collection of values from different entities, a single
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tuple (relation), or a collection of tuples.</p>
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<p>Examples:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">elements</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[
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<span class="ident">Element</span>::<span class="ident">Variable</span>(<span class="ident">Variable</span>::<span class="ident">from_valid_name</span>(<span class="string">"?foo"</span>)),
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<span class="ident">Element</span>::<span class="ident">Variable</span>(<span class="ident">Variable</span>::<span class="ident">from_valid_name</span>(<span class="string">"?bar"</span>)),
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];
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<span class="kw">let</span> <span class="ident">rel</span> <span class="op">=</span> <span class="ident">FindSpec</span>::<span class="ident">FindRel</span>(<span class="ident">elements</span>);
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<span class="kw">if</span> <span class="kw">let</span> <span class="ident">FindSpec</span>::<span class="ident">FindRel</span>(<span class="ident">elements</span>) <span class="op">=</span> <span class="ident">rel</span> {
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">2</span>, <span class="ident">elements</span>.<span class="ident">len</span>());
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}
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</pre>
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</div><h2 id='variants' class='variants small-section-header'>
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Variants<a href='#variants' class='anchor'></a></h2>
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<span id="variant.FindRel" class="variant small-section-header"><a href="#variant.FindRel" class="anchor field"></a><span id='FindRel.v' class='invisible'><code>FindRel(<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="enum" href="../edn/query/enum.Element.html" title="enum edn::query::Element">Element</a>>)</code></span></span><div class='docblock'><p>Returns an array of arrays, represented as a single array with length a multiple of width.</p>
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</div><span id="variant.FindColl" class="variant small-section-header"><a href="#variant.FindColl" class="anchor field"></a><span id='FindColl.v' class='invisible'><code>FindColl(<a class="enum" href="../edn/query/enum.Element.html" title="enum edn::query::Element">Element</a>)</code></span></span><div class='docblock'><p>Returns an array of scalars, usually homogeneous.
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This is equivalent to mapping over the results of a <code>FindRel</code>,
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returning the first value of each.</p>
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</div><span id="variant.FindTuple" class="variant small-section-header"><a href="#variant.FindTuple" class="anchor field"></a><span id='FindTuple.v' class='invisible'><code>FindTuple(<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="enum" href="../edn/query/enum.Element.html" title="enum edn::query::Element">Element</a>>)</code></span></span><div class='docblock'><p>Returns a single tuple: a heterogeneous array of scalars. Equivalent to
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taking the first result from a <code>FindRel</code>.</p>
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</div><span id="variant.FindScalar" class="variant small-section-header"><a href="#variant.FindScalar" class="anchor field"></a><span id='FindScalar.v' class='invisible'><code>FindScalar(<a class="enum" href="../edn/query/enum.Element.html" title="enum edn::query::Element">Element</a>)</code></span></span><div class='docblock'><p>Returns a single scalar value. Equivalent to taking the first result
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from a <code>FindColl</code>.</p>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="enum" href="../mentat_ffi/enum.FindSpec.html" title="enum mentat_ffi::FindSpec">FindSpec</a></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/edn/query.rs.html#673-725' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='docblock'><p>Returns true if the provided <code>FindSpec</code> returns at most one result.</p>
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</div><div class='impl-items'><h4 id='method.is_unit_limited' class="method"><span id='is_unit_limited.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.is_unit_limited' class='fnname'>is_unit_limited</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/edn/query.rs.html#674-682' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><h4 id='method.expected_column_count' class="method"><span id='expected_column_count.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.expected_column_count' class='fnname'>expected_column_count</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/edn/query.rs.html#684-691' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><h4 id='method.requires_distinct' class="method"><span id='requires_distinct.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.requires_distinct' class='fnname'>requires_distinct</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/edn/query.rs.html#712-714' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns true if the provided <code>FindSpec</code> cares about distinct results.</p>
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<p>I use the words "cares about" because find is generally defined in terms of producing distinct
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results at the Datalog level.</p>
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<p>Two of the find specs (scalar and tuple) produce only a single result. Those don't need to be
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run with <code>SELECT DISTINCT</code>, because we're only consuming a single result. Those queries will be
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run with <code>LIMIT 1</code>.</p>
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<p>Additionally, some projections cannot produce duplicate results: <code>[:find (max ?x) …]</code>, for
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example.</p>
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<p>This function gives us the hook to add that logic when we're ready.</p>
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<p>Beyond this, <code>DISTINCT</code> is not always needed. For example, in some kinds of accumulation or
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sampling projections we might not need to do it at the SQL level because we're consuming into
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a dupe-eliminating data structure like a Set, or we know that a particular query cannot produce
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duplicate results.</p>
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</div><h4 id='method.columns' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><R></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><R></h3><code class="content"><span class="where fmt-newline">impl<R> <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><R> <span class="where fmt-newline">where<br> R: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline">impl<W> <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><W> <span class="where fmt-newline">where<br> W: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline">impl<I> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::iterator::Iterator::Item">Item</a>;</span></code></div></div><span id='columns.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.columns' class='fnname'>columns</a>(&'s self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><<a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a><Item = &'s <a class="enum" href="../edn/query/enum.Element.html" title="enum edn::query::Element">Element</a>> + 's></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/edn/query.rs.html#716-724' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<div id='implementations-list'>
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<h3 id='impl-Eq' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="enum" href="../mentat_ffi/enum.FindSpec.html" title="enum mentat_ffi::FindSpec">FindSpec</a></code><a href='#impl-Eq' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/edn/query.rs.html#653' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-PartialEq%3CFindSpec%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a><<a class="enum" href="../mentat_ffi/enum.FindSpec.html" title="enum mentat_ffi::FindSpec">FindSpec</a>> for <a class="enum" href="../mentat_ffi/enum.FindSpec.html" title="enum mentat_ffi::FindSpec">FindSpec</a></code><a href='#impl-PartialEq%3CFindSpec%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/edn/query.rs.html#653' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.eq' class="method"><span id='eq.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&self, __arg_0: &<a class="enum" href="../mentat_ffi/enum.FindSpec.html" title="enum mentat_ffi::FindSpec">FindSpec</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/edn/query.rs.html#653' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
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</div><h4 id='method.ne' class="method"><span id='ne.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&self, __arg_0: &<a class="enum" href="../mentat_ffi/enum.FindSpec.html" title="enum mentat_ffi::FindSpec">FindSpec</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/edn/query.rs.html#653' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>This method tests for <code>!=</code>.</p>
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