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    <link>https://jira.mongodb.org</link>
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    <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-48625] Explain (and logs) should indicate when query planning thresholds are encountered</title>
                <link>https://jira.mongodb.org/browse/SERVER-48625</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are a handful of parameters that influence the plan generation process.&#160; Two examples would be &lt;tt&gt;internalQueryEnumerationMaxOrSolutions&lt;/tt&gt; and &lt;tt&gt;internalQueryMaxScansToExplode&lt;/tt&gt;.&#160; When encountered, these modify the set of plans that are available for selection and can have an important impact on the overall efficiency of the query (eg &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36393&quot; title=&quot;Contained $or pushdown optimization can cause internalQueryEnumerationMaxOrSolutions to be exceeded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36393&quot;&gt;SERVER-36393&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;In some situations, it is relatively easy to determine that such a threshold was encountered during planning with a high degree of confidence.&#160; For example if the query shape is a (singled) contained &lt;tt&gt;$or&lt;/tt&gt;&#160;and there are precisely ten plans that contain a &lt;tt&gt;&quot;OR&quot;&lt;/tt&gt; stage then it is very likely that the deployment is using the default value of &lt;tt&gt;10&lt;/tt&gt; for the&#160;&lt;tt&gt;internalQueryEnumerationMaxOrSolutions&lt;/tt&gt;&#160;parameter and that the threshold was encountered during the planning process.&#160; However it very quickly becomes difficult or impossible to definitively determine that these various thresholds were reached in an arbitrary situation.&#160;&#160;&lt;/p&gt;

&lt;p&gt;We should report when the planner encounters these situations in &lt;tt&gt;explain&lt;/tt&gt; output.&#160; It is also worth considering adding this to the log output as well (verbose or otherwise).&lt;/p&gt;</description>
                <environment></environment>
        <key id="1373795">SERVER-48625</key>
            <summary>Explain (and logs) should indicate when query planning thresholds are encountered</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="13201">Fixed</resolution>
                                        <assignee username="ted.tuckman@mongodb.com">Ted Tuckman</assignee>
                                    <reporter username="christopher.harris@mongodb.com">Chris Harris</reporter>
                        <labels>
                            <label>qopt-team</label>
                    </labels>
                <created>Fri, 5 Jun 2020 18:15:21 +0000</created>
                <updated>Sun, 29 Oct 2023 22:07:21 +0000</updated>
                            <resolved>Tue, 1 Dec 2020 17:26:34 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3510726" author="xgen-internal-githook" created="Tue, 1 Dec 2020 17:07:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ted Tuckman&apos;, &apos;email&apos;: &apos;ted.tuckman@mongodb.com&apos;, &apos;username&apos;: &apos;TedTuckman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48625&quot; title=&quot;Explain (and logs) should indicate when query planning thresholds are encountered&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48625&quot;&gt;&lt;del&gt;SERVER-48625&lt;/del&gt;&lt;/a&gt; Add query knobs to explain output and logs&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a9982732333fdc6fb853aa8d8596a85cd008f125&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a9982732333fdc6fb853aa8d8596a85cd008f125&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>This ticket adds fields to explain for the following three query parameters: internalQueryMaxScansToExplode (maxScansToExplodeReached), internalQueryEnumerationMaxOrSolutions (maxIndexedOrSolutionsReached), and internalQueryMaxIntersectPerAnd (maxIndexedAndSolutionsReached). When the planner hits the limits set with these knobs, the value in explain will be set to &amp;quot;true&amp;quot; and a message will be logged at log level 1. If the user does not change the values of these knobs, they will still be set if the planner hits the default limits.</customfieldvalue>

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