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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-71872] [CQF] Add heuristic: don&apos;t generate multi-index plans with a full index scan</title>
                <link>https://jira.mongodb.org/browse/SERVER-71872</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Sometimes we generate plans that involve more than one index scan, and one or more of those scans has no bounds--it scans the whole index.  Are these plans useful?&lt;/p&gt;

&lt;p&gt;If index scans and collection scans have similar cost, then a single collection scan + filter should be cheaper than multiple full index scans.  So we may want a heuristic to prevent union or intersection involving a full index scan.&lt;/p&gt;

&lt;p&gt;On the other hand, a collection scan may be much more expensive than an index scan, and the more complex indexed plan can help fetch fewer documents.  So if we add this heuristic, we should have an internal-only query knob to decide whether to apply it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2202891">SERVER-71872</key>
            <summary>[CQF] Add heuristic: don&apos;t generate multi-index plans with a full index scan</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="chii.huang@mongodb.com">Chi-I Huang</assignee>
                                    <reporter username="david.percy@mongodb.com">David Percy</reporter>
                        <labels>
                            <label>bonsai-onboarding</label>
                            <label>search-space</label>
                    </labels>
                <created>Mon, 5 Dec 2022 22:41:42 +0000</created>
                <updated>Sun, 29 Oct 2023 21:29:41 +0000</updated>
                            <resolved>Wed, 7 Jun 2023 22:14:57 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5483004" author="xgen-internal-githook" created="Wed, 7 Jun 2023 22:11:52 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Chi-I Huang&apos;, &apos;email&apos;: &apos;chii.huang@mongodb.com&apos;, &apos;username&apos;: &apos;chiihuang&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71872&quot; title=&quot;[CQF] Add heuristic: don&amp;#39;t generate multi-index plans with a full index scan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71872&quot;&gt;&lt;del&gt;SERVER-71872&lt;/del&gt;&lt;/a&gt; Add heuristic to discard unbound candidate index in a multi-index plan&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f62ba793d417efde6a7cfa4b9ce646e46196b425&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f62ba793d417efde6a7cfa4b9ce646e46196b425&lt;/a&gt;&lt;/p&gt;</comment>
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