mentat/mentat_query_projector/fn.query_projection.html
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<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'>
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<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>
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<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>
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