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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-3187] keymatch optimizations, in particular for negative predicates</title>
                <link>https://jira.mongodb.org/browse/SERVER-3187</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are some optimizations we can make to cases where we currently limit key matching.  In some cases a match is possible with a single key index while not with multikey, in some cases a match can be a keymatch based on the value being compared (for example if it is a non null value), and there are some other things we can do too.&lt;/p&gt;

&lt;p&gt;    Matcher::Matcher( const Matcher &amp;amp;other, const BSONObj &amp;amp;key ) :&lt;br/&gt;
        where(0), constrainIndexKey_( key ), haveSize(), all(), hasArray(0), haveNeg(), _atomic(false), nRegex(0) {&lt;br/&gt;
        // do not include field matches which would make keyMatch() false&lt;br/&gt;
        for( vector&amp;lt; ElementMatcher &amp;gt;::const_iterator i = other.basics.begin(); i != other.basics.end(); ++i ) {&lt;br/&gt;
            if ( key.hasField( i-&amp;gt;toMatch.fieldName() ) ) {&lt;br/&gt;
                switch( i-&amp;gt;compareOp ) {&lt;br/&gt;
                case BSONObj::opSIZE:&lt;br/&gt;
                case BSONObj::opALL:&lt;br/&gt;
                case BSONObj::NE:&lt;br/&gt;
                case BSONObj::NIN:&lt;br/&gt;
                case BSONObj::opEXISTS: // Not part of keyMatch() determination, but we can&apos;t match on index in this case.&lt;br/&gt;
                case BSONObj::opTYPE: // For $type:10 (null), a null key could be a missing field or a null value field.&lt;/p&gt;</description>
                <environment></environment>
        <key id="17863">SERVER-3187</key>
            <summary>keymatch optimizations, in particular for negative predicates</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Fri, 3 Jun 2011 15:27:53 +0000</created>
                <updated>Wed, 10 Dec 2014 23:18:16 +0000</updated>
                            <resolved>Mon, 6 Jan 2014 19:09:23 +0000</resolved>
                                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="477820" author="david.storch" created="Mon, 6 Jan 2014 19:09:23 +0000"  >&lt;p&gt;Resolving as &quot;Gone Away&quot; because I believe that this ticket is describing improvements to dead code.&lt;/p&gt;</comment>
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