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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-78502] [CQF] Relax M2 CQF fallback (tryBonsai) to allow {_id: &apos;hashed&apos;} index</title>
                <link>https://jira.mongodb.org/browse/SERVER-78502</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A sharded collection must be backed by an index on the shard key. In M2, we are running through bonsai only for collection scan plans which necessitate there being no indexes on the collection besides the primary index. However many of our sharding suites define {_id: &apos;hashed&apos;}, so we should support this case to gain more coverage of M2.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2379401">SERVER-78502</key>
            <summary>[CQF] Relax M2 CQF fallback (tryBonsai) to allow {_id: &apos;hashed&apos;} index</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="lynne.wang@mongodb.com">Lynne Wang</assignee>
                                    <reporter username="ben.shteinfeld@mongodb.com">Ben Shteinfeld</reporter>
                        <labels>
                    </labels>
                <created>Wed, 28 Jun 2023 15:55:56 +0000</created>
                <updated>Sun, 29 Oct 2023 21:19:27 +0000</updated>
                            <resolved>Thu, 7 Sep 2023 13:35:23 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5685125" author="xgen-internal-githook" created="Thu, 7 Sep 2023 01:29:38 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Lynne Wang&apos;, &apos;email&apos;: &apos;lynne.wang@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78502&quot; title=&quot;[CQF] Relax M2 CQF fallback (tryBonsai) to allow {_id: &amp;#39;hashed&amp;#39;} index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78502&quot;&gt;&lt;del&gt;SERVER-78502&lt;/del&gt;&lt;/a&gt; Relax M2 CQF fallback (tryBonsai) to allow {_id: &apos;hashed&apos;} index&lt;/p&gt;

&lt;p&gt;Removed debugging code and updated function comments&lt;/p&gt;

&lt;p&gt;Renamed hashed id index check to isHashedIdIndex, added test coverage for queries in hashed id index collections that reference _id&lt;/p&gt;

&lt;p&gt;Refactored hashed id index support in cqf logic, disabled currentop_query.js in cqf_experimental_no_passthrough&lt;/p&gt;

&lt;p&gt;Added note to update currentOp to test cqf queries&lt;/p&gt;

&lt;p&gt;Added comment about hashed id indexes in cqf_get_executor.cpp&lt;/p&gt;

&lt;p&gt;Broadened excluded suites from cqf_experimental_incompatible to cqf_incompatible&lt;/p&gt;

&lt;p&gt;Deleted unnecessary variables in cqf_command_utils logic for index checking&lt;/p&gt;

&lt;p&gt;Used isHashedIdIndex var instead of Index::Btree&lt;/p&gt;

&lt;p&gt;Explained inclusion of id hashed indexes in cqf eligibility checker&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5826444ef582b593dc49a87f1fed8e8b5fad5ee4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5826444ef582b593dc49a87f1fed8e8b5fad5ee4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5653756" author="JIRAUSER1269946" created="Wed, 23 Aug 2023 14:50:58 +0000"  >&lt;p&gt;I think &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79853&quot; title=&quot;[CQF] Generate SBE expression to hash shard key when invoking ShardFilterer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79853&quot;&gt;&lt;del&gt;SERVER-79853&lt;/del&gt;&lt;/a&gt; only handled the case of a hashed shard key and a collection scan. The remaining work is to update the fallback to allow a query which does not reference _id but has a hashed _id index to go through CQF.&lt;/p&gt;</comment>
                            <comment id="5653439" author="hana.pearlman" created="Wed, 23 Aug 2023 13:36:42 +0000"  >&lt;p&gt;Can this be closed as a dupe of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79853&quot; title=&quot;[CQF] Generate SBE expression to hash shard key when invoking ShardFilterer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79853&quot;&gt;&lt;del&gt;SERVER-79853&lt;/del&gt;&lt;/a&gt;?&lt;/p&gt;</comment>
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            <issuekey id="2412306">SERVER-79853</issuekey>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="2182320">SERVER-71280</issuekey>
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