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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-76761] [CQF] Investigate lowerEqPrefixes being called for Sargable [Seek]</title>
                <link>https://jira.mongodb.org/browse/SERVER-76761</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When I run recursive_ix_nav.js and log &lt;a href=&quot;https://github.com/10gen/mongo/blob/a575d9b94d4f44c5c33dd17050369c53ae179790/src/mongo/db/query/optimizer/cascades/implementers.cpp#L646&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this call to lowerEqPrefixes&lt;/a&gt;, specifically the value of &lt;tt&gt;const ABT&amp;amp; n&lt;/tt&gt;, I see &lt;tt&gt;Sargable &lt;span class=&quot;error&quot;&gt;&amp;#91;Seek&amp;#93;&lt;/span&gt;&lt;/tt&gt; nodes being logged.  This seems wrong because lowerEqPrefixes is responsible for creating IndexScan stages, or more generally the NLJ / distinct scan / IndexScan pattern we use for recursive index navigation.&lt;/p&gt;

&lt;p&gt;------&lt;/p&gt;

&lt;p&gt;Also, this &lt;tt&gt;Sargable &lt;span class=&quot;error&quot;&gt;&amp;#91;Seek&amp;#93;&lt;/span&gt;&lt;/tt&gt; node has a nonempty &lt;tt&gt;candidateIndexes&lt;/tt&gt; field.  I believe we always populate this field, even though we will end up ignoring it when the target is &lt;tt&gt;Seek&lt;/tt&gt;.  Instead we should probably leave it empty in the Seek case.  That could both avoid the unnecessary work to populate it, and also prevent us from calling lowerEqPrefixes unnecessarily.&lt;/p&gt;

&lt;p&gt;This seems related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78090&quot; title=&quot;[CQF] Avoid computing candidate indexes and scan params in some cases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78090&quot;&gt;SERVER-78090&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2330270">SERVER-76761</key>
            <summary>[CQF] Investigate lowerEqPrefixes being called for Sargable [Seek]</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="ruoxin.xu@mongodb.com">Ruoxin Xu</assignee>
                                    <reporter username="david.percy@mongodb.com">David Percy</reporter>
                        <labels>
                            <label>auto-reverted</label>
                    </labels>
                <created>Tue, 2 May 2023 18:25:29 +0000</created>
                <updated>Sun, 29 Oct 2023 21:22:08 +0000</updated>
                            <resolved>Tue, 22 Aug 2023 10:43:11 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5649209" author="xgen-internal-githook" created="Tue, 22 Aug 2023 07:39:21 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ruoxin Xu&apos;, &apos;email&apos;: &apos;ruoxin.xu@mongodb.com&apos;, &apos;username&apos;: &apos;RuoxinXu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76761&quot; title=&quot;[CQF] Investigate lowerEqPrefixes being called for Sargable [Seek]&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76761&quot;&gt;&lt;del&gt;SERVER-76761&lt;/del&gt;&lt;/a&gt; Move AttemptCoveringQuery rewrite to the implementer&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/84548114a0eb0e0debac104d5caa0d3c063fab4f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/84548114a0eb0e0debac104d5caa0d3c063fab4f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5618149" author="xgen-buildbaron-user" created="Mon, 7 Aug 2023 19:06:13 +0000"  >&lt;p&gt;Ticket re-opened due to revert. &lt;a href=&quot;https://evergreen.mongodb.com/task/mongodb_mongo_master_macos_debug_suggested_run_unittests_cbb3da8712c62f995fc7ffd1ea33198399ffba79_23_08_06_14_38_26&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;run_unittests&lt;/a&gt; began a consistent failure of build/install/bin/query_cost_model_test,build/install/bin/optimizer_test&lt;/p&gt;</comment>
                            <comment id="5618146" author="xgen-internal-githook" created="Mon, 7 Aug 2023 19:05:33 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;auto-revert-processor&apos;, &apos;email&apos;: &apos;dev-prod-dag@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76761&quot; title=&quot;[CQF] Investigate lowerEqPrefixes being called for Sargable [Seek]&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76761&quot;&gt;&lt;del&gt;SERVER-76761&lt;/del&gt;&lt;/a&gt; Move AttemptCoveringQuery rewrite to the implementer&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit cbb3da8712c62f995fc7ffd1ea33198399ffba79.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aa801ab622802586951afd5c2cf71e916267c0aa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aa801ab622802586951afd5c2cf71e916267c0aa&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5616191" author="xgen-internal-githook" created="Mon, 7 Aug 2023 02:41:49 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ruoxin Xu&apos;, &apos;email&apos;: &apos;ruoxin.xu@mongodb.com&apos;, &apos;username&apos;: &apos;RuoxinXu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76761&quot; title=&quot;[CQF] Investigate lowerEqPrefixes being called for Sargable [Seek]&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76761&quot;&gt;&lt;del&gt;SERVER-76761&lt;/del&gt;&lt;/a&gt; Move AttemptCoveringQuery rewrite to the implementer&lt;br/&gt;
Branch: minh.luu-no_compile_sys-perf&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cbb3da8712c62f995fc7ffd1ea33198399ffba79&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cbb3da8712c62f995fc7ffd1ea33198399ffba79&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5615847" author="xgen-internal-githook" created="Sun, 6 Aug 2023 14:38:32 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ruoxin Xu&apos;, &apos;email&apos;: &apos;ruoxin.xu@mongodb.com&apos;, &apos;username&apos;: &apos;RuoxinXu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76761&quot; title=&quot;[CQF] Investigate lowerEqPrefixes being called for Sargable [Seek]&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76761&quot;&gt;&lt;del&gt;SERVER-76761&lt;/del&gt;&lt;/a&gt; Move AttemptCoveringQuery rewrite to the implementer&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cbb3da8712c62f995fc7ffd1ea33198399ffba79&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cbb3da8712c62f995fc7ffd1ea33198399ffba79&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2368139">SERVER-78090</issuekey>
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