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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-61421] Refine plan cache key filter component to encode parameter markers</title>
                <link>https://jira.mongodb.org/browse/SERVER-61421</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/134d07ae363bc14dcafff10dd2299a1a3872c6cd/src/mongo/db/query/canonical_query_encoder.cpp#L661&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;encode&lt;/a&gt; an entire query filter BSON object into the plan cache key. In order to be able to map queries having a similar shape (as it&apos;s defined in SBE) we need to change the encoding scheme to take into account parameter markers, so that two queries&lt;/p&gt;
&lt;p/&gt;
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&lt;p&gt;and&lt;/p&gt;
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&lt;p/&gt;
&lt;p&gt;are mapped the same cached plan.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1923451">SERVER-61421</key>
            <summary>Refine plan cache key filter component to encode parameter markers</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="anton.korshunov@mongodb.com">Anton Korshunov</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Nov 2021 19:21:20 +0000</created>
                <updated>Sun, 29 Oct 2023 21:46:10 +0000</updated>
                            <resolved>Tue, 15 Mar 2022 16:53:59 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4413352" author="xgen-internal-githook" created="Tue, 15 Mar 2022 16:40:14 +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-61421&quot; title=&quot;Refine plan cache key filter component to encode parameter markers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61421&quot;&gt;&lt;del&gt;SERVER-61421&lt;/del&gt;&lt;/a&gt; Change SBE plan cache key encoding to reflect auto-parameterization&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/63a4f1e011860e34b8a29b6171e3cbdd58f15c8d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/63a4f1e011860e34b8a29b6171e3cbdd58f15c8d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4354137" author="david.storch" created="Mon, 14 Feb 2022 18:32:53 +0000"  >&lt;p&gt;Contrary to what I originally said in my previous comment, the work to flush the SBE plan cache when query knobs are adjusted will actually be done under&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62797&quot; title=&quot;Invalidate SBE plan cache when any of the query knobs is changed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62797&quot;&gt;&lt;del&gt;SERVER-62797&lt;/del&gt;&lt;/a&gt; rather than under this ticket.&lt;/p&gt;</comment>
                            <comment id="4346495" author="david.storch" created="Wed, 9 Feb 2022 21:50:33 +0000"  >&lt;p&gt;A few notes based on a discussion of this ticket with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anton.korshunov&quot; class=&quot;user-hover&quot; rel=&quot;anton.korshunov&quot;&gt;anton.korshunov&lt;/a&gt;.&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;&lt;del&gt;This ticket should include the work to stop encoding the values of various query knobs into the cache key, and instead to flush the cache when the knob is reset.&lt;/del&gt;&lt;/li&gt;
	&lt;li&gt;This ticket depends on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61422&quot; title=&quot;Update SBE filter stage builder to use parameter markers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61422&quot;&gt;&lt;del&gt;SERVER-61422&lt;/del&gt;&lt;/a&gt;. By changing the definition of the cache key, we are essentially enabling auto-parameterization. This can&apos;t be done, even just for auto-parameterized collection scan plans, without &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61422&quot; title=&quot;Update SBE filter stage builder to use parameter markers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61422&quot;&gt;&lt;del&gt;SERVER-61422&lt;/del&gt;&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;There is an open discussion about whether it is possible to enable auto-parameterization in some scenarios but not others, in particular for collection scan plans but not index scan plans. We want to get some basic auto-parameterization scenarios working end to end, ideally without having to disable SBE plan cache scenarios that are already being tested in the &quot;all feature flags&quot; builders.&lt;/li&gt;
&lt;/ol&gt;
</comment>
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                                        <issuelink>
            <issuekey id="1923461">SERVER-61422</issuekey>
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                            <issuelinktype id="10012">
                    <name>Related</name>
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                                        <issuelink>
            <issuekey id="1993509">SERVER-64137</issuekey>
        </issuelink>
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            <issuekey id="1967537">SERVER-62797</issuekey>
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