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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <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-30761] Optimize parsing code for top-level MatchExpressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-30761</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The MatchExpression parser has a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3128427f77397916967e3eb684dfed845bb1638a/src/mongo/db/matcher/expression_parser.cpp#L460&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;giant if block&lt;/a&gt; that performs many string comparisons as it attempts to parse a top-level keyword. We should attempt to optimize this to reduce the number of string comparisons.&lt;/p&gt;

&lt;p&gt;A hash map seems like a better choice.&lt;/p&gt;</description>
                <environment></environment>
        <key id="418470">SERVER-30761</key>
            <summary>Optimize parsing code for top-level MatchExpressions</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="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                    </labels>
                <created>Mon, 21 Aug 2017 16:16:27 +0000</created>
                <updated>Mon, 30 Oct 2023 23:14:09 +0000</updated>
                            <resolved>Tue, 17 Oct 2017 17:28:59 +0000</resolved>
                                                    <fixVersion>3.6.0-rc1</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1701522" author="xgen-internal-githook" created="Tue, 17 Oct 2017 17:25:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;blake.oler@10gen.com&apos;, &apos;name&apos;: &apos;Blake Oler&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30761&quot; title=&quot;Optimize parsing code for top-level MatchExpressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30761&quot;&gt;&lt;del&gt;SERVER-30761&lt;/del&gt;&lt;/a&gt; Optimize parsing code for top-level MatchExpressions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5542ff2d88bcfdcf87c7643a0c7df88313a95a88&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5542ff2d88bcfdcf87c7643a0c7df88313a95a88&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1665380" author="tess.avitabile" created="Wed, 6 Sep 2017 13:42:26 +0000"  >&lt;p&gt;Sure, I can pick this up. I might be tempted to do a larger cleanup of the &lt;tt&gt;MatchExpression&lt;/tt&gt; parser, for example the inconsistent handling of operators that are only allowed at the top level (&lt;tt&gt;$where&lt;/tt&gt;, &lt;tt&gt;$atomic&lt;/tt&gt;/&lt;tt&gt;$isolated&lt;/tt&gt;, &lt;tt&gt;$geoNear&lt;/tt&gt;), and generally looking for bugs and seeing how I might make this easier to follow.&lt;/p&gt;</comment>
                            <comment id="1665371" author="david.storch" created="Wed, 6 Sep 2017 13:36:36 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt;, do you have time to pick up this task? Expressive $lookup work definitely takes priority, but it seems you may be partially blocked on that at the moment.&lt;/p&gt;</comment>
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            <issuekey id="471703">SERVER-32302</issuekey>
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