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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-58276] Add time-series bounded collection scan plans to query multi-planner</title>
                <link>https://jira.mongodb.org/browse/SERVER-58276</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54398&quot; title=&quot;Extend query planner to generate bounded collection scan plans for time series collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54398&quot;&gt;&lt;del&gt;SERVER-54398&lt;/del&gt;&lt;/a&gt;, queries on time-series collections will only consider a bounded collection scan when no indexed solution is available. However there are cases where the bounded collection scan results in better performance than an indexed plan, for example when the indexed solution has wide index bounds and must fetch many documents. We should add the bounded collection scan as a potential plan and compare it with indexed solutions in the query multi-planning process.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1809313">SERVER-58276</key>
            <summary>Add time-series bounded collection scan plans to query multi-planner</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</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="ivan.fefer@mongodb.com">Ivan Fefer</assignee>
                                    <reporter username="katherine.wu@mongodb.com">Katherine Wu</reporter>
                        <labels>
                            <label>M2</label>
                    </labels>
                <created>Tue, 6 Jul 2021 14:18:53 +0000</created>
                <updated>Sun, 29 Oct 2023 21:51:20 +0000</updated>
                            <resolved>Wed, 2 Nov 2022 14:49:58 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                    <fixVersion>6.0.7</fixVersion>
                                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="5449834" author="xgen-internal-githook" created="Wed, 24 May 2023 18:56:52 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58276&quot; title=&quot;Add time-series bounded collection scan plans to query multi-planner&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58276&quot;&gt;&lt;del&gt;SERVER-58276&lt;/del&gt;&lt;/a&gt; Add collscan plan if collection is clustered and collscan uses clustered index&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 76e583ed12d536aba872920568b5324d1dcae713)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5efae388204b02f89c0ad060cee63d548efbfcfe&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5efae388204b02f89c0ad060cee63d548efbfcfe&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4948232" author="xgen-internal-githook" created="Wed, 2 Nov 2022 14:41:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58276&quot; title=&quot;Add time-series bounded collection scan plans to query multi-planner&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58276&quot;&gt;&lt;del&gt;SERVER-58276&lt;/del&gt;&lt;/a&gt; Add collscan plan if collection is clustered and collscan uses clustered index&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/76e583ed12d536aba872920568b5324d1dcae713&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/76e583ed12d536aba872920568b5324d1dcae713&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4770248" author="JIRAUSER1259232" created="Tue, 23 Aug 2022 14:02:23 +0000"  >&lt;p&gt;Additional note from a cloesd PoC ticket which is a duplicate of this:&lt;/p&gt;

&lt;p&gt;&quot;Our current query planner does not consider _id index for multi-planning. In the presence of a secondary index on timeField, we always use the secondary index. Using the index on time field, we scan the index tree, and then do another lookup in the record store to fetch the bucket document. Where as if we use the _id index, then we can answer the query with just scans on the record store. So some query might perform better with _id over time index.&lt;/p&gt;

&lt;p&gt;The downside of _id index is that we only index the&#160;&lt;tt&gt;control.min.time&lt;/tt&gt;, where as an index on&#160;&lt;tt&gt;timeField&lt;/tt&gt;&#160;with be compounded with&#160;&lt;tt&gt;control.min.time: 1, control.max.time&lt;/tt&gt;. So the bounds will be narrower with&#160;&lt;tt&gt;timeField&lt;/tt&gt; index. We need to evaluate this trade-off using multi-planning.&quot;&lt;/p&gt;

&lt;p&gt;Early experiment showed this could speed up queries with filter on time by about 5%.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
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            <issuekey id="1851068">SERVER-59341</issuekey>
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                            <customfieldvalue>We now consider clustered index scan in multi planning if it can be used., so now it will compete with secondary indexes.&lt;br/&gt;
In previous versions we only considered clustered index scan if there is no secondary indexes or an explicit hint was given: &lt;a href=&quot;https://www.mongodb.com/docs/manual/core/clustered-collections/#limitations&quot;&gt;https://www.mongodb.com/docs/manual/core/clustered-collections/#limitations&lt;/a&gt;</customfieldvalue>

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