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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-1187] Queries should return information if $maxScan was reached</title>
                <link>https://jira.mongodb.org/browse/SERVER-1187</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Sometimes it&apos;s useful to know if $maxScan was reached during query execution (for example if you want to inform your users about it). Therefore there should be a way to know if query execution reached $maxScan.&lt;/p&gt;</description>
                <environment></environment>
        <key id="12062">SERVER-1187</key>
            <summary>Queries should return information if $maxScan was reached</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="tzehetner">Thomas Zehetner</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Jun 2010 18:54:28 +0000</created>
                <updated>Fri, 7 Apr 2023 12:52:13 +0000</updated>
                            <resolved>Wed, 14 Feb 2018 16:15:46 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>8</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1805648" author="david.storch" created="Wed, 14 Feb 2018 16:15:46 +0000"  >&lt;p&gt;The maxScan feature is being deprecated (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32953&quot; title=&quot;Log a deprecation warning when the maxScan find option is used.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32953&quot;&gt;&lt;del&gt;SERVER-32953&lt;/del&gt;&lt;/a&gt;), so we do not plan to pursue this improvement. Closing as &quot;Won&apos;t Fix&quot;.&lt;/p&gt;</comment>
                            <comment id="110853" author="drewp" created="Tue, 17 Apr 2012 20:18:29 +0000"  >&lt;p&gt;I have a case where I&apos;d actually like to know the record that was reached at maxScan, so I can plan a followup query. &lt;/p&gt;

&lt;p&gt;Case 1:&lt;br/&gt;
I&apos;m searching through a lot of log data, and I&apos;d like my GUI to be able to say &quot;we&apos;ve queried 4 days so far.. 5 days.. etc&quot; even when we haven&apos;t found a page of matches yet. &lt;/p&gt;

&lt;p&gt;Case 2:&lt;br/&gt;
I have an infinite-paging type of GUI. The first request says &quot;find matches starting at time T5 going backwards (with maxScan 100000)&quot;. Then the user scrolls back to T3. Have I already covered the new visible range with my first query, or do I have to make a new query? Receiving the last scanned doc would help with this.&lt;/p&gt;</comment>
                            <comment id="81705" author="lacker" created="Mon, 23 Jan 2012 18:28:20 +0000"  >&lt;p&gt;This would definitely be helpful. For safety I would like to prevent any engineer working on the codebase from introducing a query that hits maxScan, so I want to add code in our db wrapper layer that throws an error whenever that happens.&lt;/p&gt;</comment>
                            <comment id="62751" author="sijakubo" created="Wed, 26 Oct 2011 13:41:40 +0000"  >&lt;p&gt;That would be a very helpful feature! &lt;/p&gt;</comment>
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