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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-52664] Explore more simple ways to generate SBE expressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-52664</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently we use&#160;&lt;tt&gt;makeE&lt;/tt&gt; functions to create SBE expressions in builders for aggregation expressions and find. Code for complex expressions is not easy to read and quite verbose. We should explore how we can generate SBE expressions in a more simple way.&lt;/p&gt;

&lt;p&gt;We have identified two options during the team discussion:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Compile-time parser for DSL describing SBE expressions. We have a working prototype created by &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nikita.lapkov&quot; class=&quot;user-hover&quot; rel=&quot;nikita.lapkov&quot;&gt;nikita.lapkov&lt;/a&gt; during Skunkworks: &lt;a href=&quot;https://github.com/laplab/mongo/tree/sbe_strings&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/laplab/mongo/tree/sbe_strings&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;C++ operator overloading and expression templates for constructing SBE expressions. This idea was proposed by &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anton.korshunov&quot; class=&quot;user-hover&quot; rel=&quot;anton.korshunov&quot;&gt;anton.korshunov&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=martin.neupauer&quot; class=&quot;user-hover&quot; rel=&quot;martin.neupauer&quot;&gt;martin.neupauer&lt;/a&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;In the scope of this ticket we need to understand limitations of the first approach and experiment with the second one.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1535995">SERVER-52664</key>
            <summary>Explore more simple ways to generate SBE expressions</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="nikita.lapkov@mongodb.com">Nikita Lapkov</reporter>
                        <labels>
                            <label>qexec-team</label>
                            <label>sbe-post-v1</label>
                    </labels>
                <created>Fri, 6 Nov 2020 17:05:20 +0000</created>
                <updated>Tue, 6 Dec 2022 01:45:41 +0000</updated>
                                                                            <component>Querying</component>
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