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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-1021] if scanAndOrder and full index scan are both options, may want to always try both</title>
                <link>https://jira.mongodb.org/browse/SERVER-1021</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;think about if there are different cases where we should adjust this policy&lt;/p&gt;

&lt;p&gt;see SUPPORT-33 for example&lt;/p&gt;</description>
                <environment></environment>
        <key id="11784">SERVER-1021</key>
            <summary>if scanAndOrder and full index scan are both options, may want to always try both</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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>Wed, 14 Apr 2010 03:53:09 +0000</created>
                <updated>Tue, 12 Jul 2016 00:29:16 +0000</updated>
                            <resolved>Tue, 7 Jan 2014 19:08:28 +0000</resolved>
                                                    <fixVersion>2.5.5</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="13627" author="aaron" created="Wed, 14 Apr 2010 10:52:37 +0000"  >&lt;p&gt;So depending on the data we can sometimes do scan and order and sometimes can&apos;t, even though the queries are basically the same.  We decide if a scan is taking too long by comparing nscanned to the last similar query.  In the problem case here the last similar query scanned all documents (which was optimal b/c scan and order would use too much memory), so we don&apos;t notice a problem.&lt;/p&gt;</comment>
                            <comment id="13625" author="eliot" created="Wed, 14 Apr 2010 10:06:35 +0000"  >&lt;p&gt;do you think sometimes its picking the right one and sometimes wrong?&lt;br/&gt;
should the logic where if the scan is taking longer than expected the other plans start kck in?&lt;/p&gt;</comment>
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