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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-79400] Implement number of documents tie breaking heuristics</title>
                <link>https://jira.mongodb.org/browse/SERVER-79400</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In case if several candidate plans achieved the same highest score, prefer a plan which fetches a smaller number of documents.&lt;/p&gt;

&lt;p&gt;Implementation details:&lt;br/&gt;
In &lt;a href=&quot;https://github.com/10gen/mongo/blob/7522c7b356d741489918f54b81e1c499ddb9a4e8/src/mongo/db/query/plan_ranker_util.h#L54-L55&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;pickBestPlan&lt;/a&gt; function, right after we sort candidate plans:&lt;br/&gt;
1. Identified the tied plans&lt;br/&gt;
2. Compare the tied plans by number of examined documents&lt;br/&gt;
3. Increase score for the plan with fewer examined documents by epsilon value (which is defined above as a constant equals to 1e-4)&lt;br/&gt;
4. re-sort the plans&lt;/p&gt;</description>
                <environment></environment>
        <key id="2402408">SERVER-79400</key>
            <summary>Implement number of documents tie breaking heuristics</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="katie.yang@mongodb.com">Katie Yang</assignee>
                                    <reporter username="alexander.ignatyev@mongodb.com">Alexander Ignatyev</reporter>
                        <labels>
                            <label>auto-reverted</label>
                            <label>bkp</label>
                    </labels>
                <created>Thu, 27 Jul 2023 09:40:08 +0000</created>
                <updated>Wed, 31 Jan 2024 15:51:10 +0000</updated>
                            <resolved>Fri, 25 Aug 2023 15:09:57 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.6</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="6056134" author="xgen-internal-githook" created="Wed, 31 Jan 2024 15:51:10 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Katie Yang&apos;, &apos;email&apos;: &apos;katie.yang@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79400&quot; title=&quot;Implement number of documents tie breaking heuristics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79400&quot;&gt;&lt;del&gt;SERVER-79400&lt;/del&gt;&lt;/a&gt; Implement tie breaking by number of documents examined&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 635896212da75f54af49272cb8dba0d95c270262)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 83c24f81f7f2034e43a8cfacb943c96b181936fc&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d27c5bdb87a0499a8402cc9493516ac967db0c82&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d27c5bdb87a0499a8402cc9493516ac967db0c82&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5659483" author="xgen-internal-githook" created="Fri, 25 Aug 2023 15:08:02 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Katie Yang&apos;, &apos;email&apos;: &apos;katie.yang@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79400&quot; title=&quot;Implement number of documents tie breaking heuristics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79400&quot;&gt;&lt;del&gt;SERVER-79400&lt;/del&gt;&lt;/a&gt; Implement tie breaking by number of documents examined&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/635896212da75f54af49272cb8dba0d95c270262&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/635896212da75f54af49272cb8dba0d95c270262&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5652703" author="xgen-buildbaron-user" created="Wed, 23 Aug 2023 06:15:57 +0000"  >&lt;p&gt;Ticket re-opened due to revert. &lt;a href=&quot;https://evergreen.mongodb.com/task/mongodb_mongo_master_enterprise_amazon_linux2_arm64_all_feature_flags_display_cqf_experimental_no_passthrough_cd704a63eecc581e5ebb7aa61931926968ef589c_23_08_22_17_30_16&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cqf_experimental_no_passthrough&lt;/a&gt; began a consistent failure of jstests/noPassthrough/multiplanner_tie_breaking.js&lt;/p&gt;</comment>
                            <comment id="5652700" author="xgen-internal-githook" created="Wed, 23 Aug 2023 06:13:51 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;auto-revert-processor&apos;, &apos;email&apos;: &apos;dev-prod-dag@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79400&quot; title=&quot;Implement number of documents tie breaking heuristics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79400&quot;&gt;&lt;del&gt;SERVER-79400&lt;/del&gt;&lt;/a&gt; Implement tie breaking by number of documents examined&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit cd704a63eecc581e5ebb7aa61931926968ef589c.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d00599923357ae5f8c25ba911c250552012d0325&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d00599923357ae5f8c25ba911c250552012d0325&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5651190" author="xgen-internal-githook" created="Tue, 22 Aug 2023 17:30:20 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Katie Yang&apos;, &apos;email&apos;: &apos;katie.yang@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79400&quot; title=&quot;Implement number of documents tie breaking heuristics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79400&quot;&gt;&lt;del&gt;SERVER-79400&lt;/del&gt;&lt;/a&gt; Implement tie breaking by number of documents examined&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cd704a63eecc581e5ebb7aa61931926968ef589c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cd704a63eecc581e5ebb7aa61931926968ef589c&lt;/a&gt;&lt;/p&gt;</comment>
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