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<channel>
    <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>
    </build-info>


<item>
            <title>[SERVER-63902] Natural hints no longer work on TS collections when featureFlagTimeseriesMetricIndexes is enabled</title>
                <link>https://jira.mongodb.org/browse/SERVER-63902</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hinting $natural on a Timeseries collection no longer works. It appears a recent commit may have broke this functionality. Hinting $natural should always correspond to the clustered index which is built at collection create for a Timeseries collection and all the versions tested below show the clustered index as true in listCollections which is expected, yet the error observed in 5.3 rc0 and latest, 6.0.0-alpha-8-gaba3de6 refers to no index being created&lt;/p&gt;

&lt;p&gt;Testing the above steps on 5.2 correctly work as expected and do not produce an error. However, testing on the latest and 5.3 rc0 produces the error. The offending commit seems to have been introduced sometime between 5.2 and 5.3 rc0 &lt;/p&gt;

&lt;p&gt;Once we correct the issue we should add a test for this case&lt;/p&gt;</description>
                <environment></environment>
        <key id="1988513">SERVER-63902</key>
            <summary>Natural hints no longer work on TS collections when featureFlagTimeseriesMetricIndexes is enabled</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="david.percy@mongodb.com">David Percy</assignee>
                                    <reporter username="michael.gargiulo@mongodb.com">Michael Gargiulo</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Feb 2022 11:29:46 +0000</created>
                <updated>Sun, 29 Oct 2023 21:42:05 +0000</updated>
                            <resolved>Mon, 4 Apr 2022 20:05:26 +0000</resolved>
                                    <version>5.3.0-rc0</version>
                                    <fixVersion>6.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="4455424" author="xgen-internal-githook" created="Mon, 4 Apr 2022 17:02:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Percy&apos;, &apos;email&apos;: &apos;david.percy@mongodb.com&apos;, &apos;username&apos;: &apos;dpercy&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63902&quot; title=&quot;Natural hints no longer work on TS collections when featureFlagTimeseriesMetricIndexes is enabled&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63902&quot;&gt;&lt;del&gt;SERVER-63902&lt;/del&gt;&lt;/a&gt; Fix $natural hint on time-series collections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7ecd542de5c542c27856032c219a06900778ea3a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7ecd542de5c542c27856032c219a06900778ea3a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4372401" author="kyle.suarez" created="Wed, 23 Feb 2022 19:16:33 +0000"  >&lt;p&gt;I also edited the ticket title to make that more clear.&lt;/p&gt;</comment>
                            <comment id="4372393" author="david.percy" created="Wed, 23 Feb 2022 19:14:29 +0000"  >&lt;p&gt;The feature flag is now disabled on 5.3 (&lt;a href=&quot;https://github.com/10gen/mongo/commit/687a404519f8c83e494aa3523aed7ef9d0784bff&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/commit/687a404519f8c83e494aa3523aed7ef9d0784bff&lt;/a&gt;), and I confirmed that this bug no longer appears there, so I think we can lower the priority.&lt;/p&gt;</comment>
                            <comment id="4372212" author="david.percy" created="Wed, 23 Feb 2022 18:20:59 +0000"  >&lt;p&gt;Looks like the problem is that ResolvedView::asExpandedViewAggregation calls timeseries::createBucketsIndexSpecFromTimeseriesIndexSpec on {$natural: 1}: &lt;a href=&quot;https://github.com/10gen/mongo/blob/5d99bcaa999e8ca595e36642bdd174abe6986929/src/mongo/db/views/resolved_view.cpp#L189&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/5d99bcaa999e8ca595e36642bdd174abe6986929/src/mongo/db/views/resolved_view.cpp#L189&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;{$natural: 1} is a valid hint but not a valid index spec.  timeseries::createBucketsIndexSpecFromTimeseriesIndexSpec expects an index spec, so it mistranslates {$natural: 1} to {control.min.$natural: 1, control.max.$natural: 1}.&lt;/p&gt;</comment>
                            <comment id="4372092" author="david.percy" created="Wed, 23 Feb 2022 17:44:04 +0000"  >&lt;p&gt;It looks like this only reproduces when featureFlagTimeseriesMetricIndexes is enabled.  The flag is disabled on master (as of &lt;a href=&quot;https://github.com/10gen/mongo/commit/239052f6e878dcf0892a8ae33b9e69c30a6ffc6d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/commit/239052f6e878dcf0892a8ae33b9e69c30a6ffc6d&lt;/a&gt;) and soon will be disabled on 5.3.&lt;/p&gt;</comment>
                            <comment id="4371282" author="louis.williams" created="Wed, 23 Feb 2022 13:57:46 +0000"  >&lt;p&gt;When I reproduce on 5.3, the `hintObj` on &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2fca2d4e19a642fd97374dfde65bc04799b73f58/src/mongo/db/query/query_planner.cpp#L692&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this line in the query planner&lt;/a&gt; is equal to:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;(gdb) p hintObj&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$8 = owned BSONObj 57 bytes @ 0x7fffc3829028 = {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  [control.min.$natural] = 1,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  [control.max.$natural] = 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;So it seems like we&apos;re not recognizing the hint as $natural and trying to convert it to an index hint.&lt;/p&gt;

&lt;p&gt;On master, this works correctly:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;(gdb) p hintObj&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$7 = owned BSONObj 19 bytes @ 0x7fffca6da208 = {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  [$natural] = 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="4371228" author="louis.williams" created="Wed, 23 Feb 2022 13:37:41 +0000"  >&lt;p&gt;Strangely enough this does not reproduce on master.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10520">
                    <name>Problem/Incident</name>
                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="2020583">SERVER-65393</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2079592">SERVER-67648</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is caused by">
                                        <issuelink>
            <issuekey id="1826400">SERVER-58716</issuekey>
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	&lt;li&gt;Create a Timeseries Collection on 5.3 rc0&lt;/li&gt;
	&lt;li&gt;Run a query with a nautral hint: find().hint({$natural: 1})&lt;/li&gt;
	&lt;li&gt;Observe error: &quot;error processing query: ns=test.system.buckets.Collection0Tree: $and\nSort: {}\nProj: {}\nCollation: 
{ locale: \&quot;simple\&quot; }
&lt;p&gt;\n planner returned error :: caused by :: hint provided does not correspond to an existing index&quot;&lt;/p&gt;&lt;/li&gt;
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