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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-69795] Use empty array counter for CE for PathArr in SargableNode</title>
                <link>https://jira.mongodb.org/browse/SERVER-69795</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When estimating an $elemMatch predicate, the requirements map of a Sargable node may include a special &apos;PathArr&apos; predicate that signals we should estimate this field using $elemMatch semantics. This predicate may be split out into its own SargableNode during the MemoExploration phase.&lt;/p&gt;

&lt;p&gt;When this happens, we need a special case in order to get a correct estimate when we see a Sargable node with just a requirements map entry like &lt;tt&gt;PathGet &quot;a&quot; PathIdentity &lt;span class=&quot;error&quot;&gt;&amp;#91;array interval&amp;#93;&lt;/span&gt;&lt;/tt&gt;. We should use a counter of empty arrays in statistics to obtain a reasonable estimate for the proportion of arrays we expect in the output of the SargableNode.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2140463">SERVER-69795</key>
            <summary>Use empty array counter for CE for PathArr in SargableNode</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="timour.katchaounov@mongodb.com">Timour Katchaounov</assignee>
                                    <reporter username="alya.berciu@mongodb.com">Alya Berciu</reporter>
                        <labels>
                            <label>M2</label>
                    </labels>
                <created>Mon, 19 Sep 2022 14:40:24 +0000</created>
                <updated>Sun, 29 Oct 2023 21:33:07 +0000</updated>
                            <resolved>Wed, 12 Oct 2022 14:11:37 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4901477" author="xgen-internal-githook" created="Thu, 13 Oct 2022 16:38:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Timour Katchaounov&apos;, &apos;email&apos;: &apos;timour.katchaounov@mongodb.com&apos;, &apos;username&apos;: &apos;timourk&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69795&quot; title=&quot;Use empty array counter for CE for PathArr in SargableNode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69795&quot;&gt;&lt;del&gt;SERVER-69795&lt;/del&gt;&lt;/a&gt; PathArr estimation via Array type counter&lt;/p&gt;

&lt;p&gt;Fix linter error.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6b1ee37c1f04ae349636047b3619bcb9829d7e7b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6b1ee37c1f04ae349636047b3619bcb9829d7e7b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4897843" author="JIRAUSER1258247" created="Wed, 12 Oct 2022 14:09:46 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=svilen.mihaylov%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;svilen.mihaylov@mongodb.com&quot;&gt;svilen.mihaylov@mongodb.com&lt;/a&gt; could you give us some more information about PathObj? Few examples perhaps. I wasn&apos;t aware until this comment that we have to estimate it as an interval. I will file a ticket once you provide some more details (asked below).&lt;/p&gt;

&lt;p&gt;Do you mean that PathObj can also end up alone in a SargableNode as a special interval? How do we recognize its special interval?&lt;/p&gt;

&lt;p&gt;If so, we should be able to estimate it via the type counter for objects.&lt;/p&gt;</comment>
                            <comment id="4897714" author="xgen-internal-githook" created="Wed, 12 Oct 2022 13:41:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Timour Katchaounov&apos;, &apos;email&apos;: &apos;timour.katchaounov@mongodb.com&apos;, &apos;username&apos;: &apos;timourk&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69795&quot; title=&quot;Use empty array counter for CE for PathArr in SargableNode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69795&quot;&gt;&lt;del&gt;SERVER-69795&lt;/del&gt;&lt;/a&gt; PathArr estimation via Array type counter&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ea85b99ada1fe21761f1e4f442f53509fda09d3a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ea85b99ada1fe21761f1e4f442f53509fda09d3a&lt;/a&gt;&lt;/p&gt;</comment>
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