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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>
    </build-info>


<item>
            <title>[SERVER-47223] geoNear/$geoNear does not apply index hints</title>
                <link>https://jira.mongodb.org/browse/SERVER-47223</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Prior to MongoDB 4.2 (4.1.1 specifically) the &lt;tt&gt;$geoNear&lt;/tt&gt; aggregation stage was internally issuing a &lt;tt&gt;geoNear&lt;/tt&gt; command through the &lt;br/&gt;
&lt;tt&gt;DBDirect&lt;/tt&gt; client. With &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35043&quot; title=&quot;Remove geoNear command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35043&quot;&gt;&lt;del&gt;SERVER-35043&lt;/del&gt;&lt;/a&gt; the &lt;tt&gt;geoNear&lt;/tt&gt; command was removed and the necessary logic merged into the aggregation stage.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;MongoDB 4.0.17&lt;/b&gt;&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;2020-03-31T07:44:58.950-0400 I COMMAND  &lt;span class=&quot;error&quot;&gt;&amp;#91;conn7&amp;#93;&lt;/span&gt; command admin.foo appName: &quot;MongoDB Shell&quot; command: geoNear { geoNear: &quot;foo&quot;, near: { coordinates: [ 106.65589, 10.787627 ], type: &quot;Point&quot; }, num: 100, query: { _id: { $in: [ &quot;1&quot;, &quot;2&quot;, &quot;3&quot; ] }, state: &quot;ACTIVE&quot; }, collation: { locale: &quot;simple&quot; }, spherical: true, distanceMultiplier: 1.0, key: &quot;location&quot;, $db: &quot;admin&quot; } planSummary: GEO_NEAR_2DSPHERE { _id: 1, location: &quot;2dsphere&quot;, state: 1 } keysExamined:0 docsExamined:0 numYields:0 reslen:128 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 2 } }, Collection: { acquireCount: { r: 2 } } } protocol:op_msg 0ms&lt;/p&gt;&lt;/blockquote&gt;
&lt;blockquote&gt;&lt;p&gt;2020-03-31T07:44:58.951-0400 I COMMAND  &lt;span class=&quot;error&quot;&gt;&amp;#91;conn7&amp;#93;&lt;/span&gt; command admin.foo appName: &quot;MongoDB Shell&quot; command: aggregate { aggregate: &quot;foo&quot;, pipeline: [ { $geoNear: { query: { _id: { $in: [ &quot;1&quot;, &quot;2&quot;, &quot;3&quot; ] }, state: &quot;ACTIVE&quot; }, spherical: true, near: { coordinates: [ 106.65589, 10.787627 ], type: &quot;Point&quot; }, distanceField: &quot;distance&quot;, key: &quot;location&quot; } }, { $project: { id: 1.0, name: 1.0 } } ], hint: { _id: 1.0, location: &quot;2dsphere&quot;, state: 1.0 }, cursor: {}, lsid: { id: UUID(&quot;46e819d1-9d58-43ed-aee0-97d37cd0ba09&quot;) }, $db: &quot;admin&quot; } keysExamined:0 docsExamined:0 cursorExhausted:1 numYields:0 nreturned:0 reslen:98 locks:{ Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 2 } }, Collection: { acquireCount: { r: 2 } } } protocol:op_msg 2ms&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Given the two log lines shared you can see that the initial &lt;tt&gt;geoNear&lt;/tt&gt; command has chosen a different index than what was hinted to the pipeline. This appears to be due to how the call from &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.3/src/mongo/db/pipeline/document_source_geo_near.cpp#L189&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;DocumentSourceGeoNear::runCommand()&lt;/tt&gt;&lt;/a&gt; is building the command (see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.3/src/mongo/db/pipeline/document_source_geo_near.cpp#L143&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;DocumentSourceGeoNear::buildGeoNearCmd()&lt;/tt&gt;&lt;/a&gt;). The underlying &lt;tt&gt;geoNear&lt;/tt&gt; command does not appear to take the hint from the pipeline when it is constructed so the query planner has to decide which index to use.&lt;/p&gt;

&lt;p&gt;This bug affects the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/304a4e70c21b31cce2201f532a538dd8f0b9e677/src/mongo/db/commands/geo_near_cmd.cpp#L213-L217&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;geoNear&lt;/tt&gt; command&lt;/a&gt; as well when it is invoked directly.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;MongoDB 4.2.5&lt;/b&gt;&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;2020-04-01T09:53:34.479-0400 I  COMMAND  &lt;span class=&quot;error&quot;&gt;&amp;#91;conn3&amp;#93;&lt;/span&gt; command admin.foo command: aggregate { aggregate: &quot;foo&quot;, pipeline: [ { $geoNear: { query: { _id: { $in: [ &quot;1&quot;, &quot;2&quot;, &quot;3&quot; ] }, state: &quot;ACTIVE&quot; }, spherical: true, near: { coordinates: [ 106.65589, 10.787627 ], type: &quot;Point&quot; }, distanceField: &quot;distance&quot;, key: &quot;location&quot; } }, { $project: { id: 1.0, name: 1.0, distance: 1.0 } } ], cursor: {}, $db: &quot;admin&quot;, $readPreference: { mode: &quot;primaryPreferred&quot; } } planSummary: IXSCAN { location: &quot;2dsphere&quot; }, IXSCAN { location: &quot;2dsphere&quot; }, IXSCAN { location: &quot;2dsphere&quot; }, IXSCAN { location: &quot;2dsphere&quot; }, IXSCAN { location: &quot;2dsphere&quot; }, IXSCAN { location: &quot;2dsphere&quot; }, IXSCAN { location: &quot;2dsphere&quot; } keysExamined:7 docsExamined:2 fromMultiPlanner:1 cursorExhausted:1 numYields:0 nreturned:1 queryHash:54B91EED planCacheKey:B1991E01 reslen:150 locks:{ ReplicationStateTransition: { acquireCount: { w: 2 } }, Global: { acquireCount: { r: 2 } }, Database: { acquireCount: { r: 2 } }, Collection: { acquireCount: { r: 2 } }, Mutex: { acquireCount: { r: 2 } } } storage:{ data: { bytesRead: 223 } } protocol:op_msg 3ms&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Even once the &lt;tt&gt;geoNear&lt;/tt&gt; command is no longer in use (MongoDB 4.2) the pipeline stage still discards the hint (it is not logged either).&lt;/p&gt;

&lt;p&gt;Note that this behavior can be reproduced as follows:&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;db.setProfilingLevel(0, { slowms: 0 })&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;db.foo.drop();&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;db.foo.insert({ _id: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;1&quot;&lt;/span&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;, state: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;ACTIVE&quot;&lt;/span&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;, location: [106, 10], name: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;TEST&quot;&lt;/span&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;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;db.foo.createIndex({ location: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;2dsphere&quot;&lt;/span&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;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;db.foo.createIndex({ _id: 1, location: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;2dsphere&quot;&lt;/span&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;, state: 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;   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;db.foo.aggregate([&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;{ $geoNear: {&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;  query: { &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;    _id: { $&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;in&lt;/span&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;1&quot;&lt;/span&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;2&quot;&lt;/span&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;3&quot;&lt;/span&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;
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				&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;    state: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;ACTIVE&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;  },&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;  spherical: &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;true&lt;/span&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;
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				&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;  near: { coordinates: [106.65589, 10.787627], type: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;Point&quot;&lt;/span&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;
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						&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;  distanceField: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;distance&quot;&lt;/span&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;
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				&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;  key: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;location&quot;&lt;/span&gt;&lt;/pre&gt;
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				&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;}}, &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;{ $project: {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="1299745">SERVER-47223</key>
            <summary>geoNear/$geoNear does not apply index hints</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="mihai.andrei@mongodb.com">Mihai Andrei</assignee>
                                    <reporter username="alex.bevilacqua@mongodb.com">Alex Bevilacqua</reporter>
                        <labels>
                    </labels>
                <created>Wed, 1 Apr 2020 13:26:28 +0000</created>
                <updated>Sun, 29 Oct 2023 22:10:08 +0000</updated>
                            <resolved>Mon, 22 Jun 2020 13:19:16 +0000</resolved>
                                    <version>4.2.3</version>
                    <version>4.0.17</version>
                                    <fixVersion>4.0.20</fixVersion>
                    <fixVersion>4.4.0-rc11</fixVersion>
                    <fixVersion>4.2.9</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3223768" author="xgen-internal-githook" created="Thu, 25 Jun 2020 14:06:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mihai Andrei&apos;, &apos;email&apos;: &apos;mihai.andrei@10gen.com&apos;, &apos;username&apos;: &apos;mtandrei&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47223&quot; title=&quot;geoNear/$geoNear does not apply index hints&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47223&quot;&gt;&lt;del&gt;SERVER-47223&lt;/del&gt;&lt;/a&gt; geoNear/$geoNear does not apply index hints&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e1d82874e90ed0cb7fd6898edc54d47c1a42b97c)&lt;br/&gt;
(cherry picked from commit bcb0cf270fdbcb6d1cbf9998e29afbfe4cbeebde)&lt;br/&gt;
(cherry picked from commit ae22f844e2e142f6f973edd210dbc511a9dc1ef0)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2d6458d8a1a8de3f58d2f8c6747b60971ff9800f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2d6458d8a1a8de3f58d2f8c6747b60971ff9800f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3218577" author="xgen-internal-githook" created="Mon, 22 Jun 2020 22:16:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mihai Andrei&apos;, &apos;email&apos;: &apos;mihai.andrei@10gen.com&apos;, &apos;username&apos;: &apos;mtandrei&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47223&quot; title=&quot;geoNear/$geoNear does not apply index hints&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47223&quot;&gt;&lt;del&gt;SERVER-47223&lt;/del&gt;&lt;/a&gt; Verify that $geoNear applies index hint correctly&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e1d82874e90ed0cb7fd6898edc54d47c1a42b97c)&lt;br/&gt;
(cherry picked from commit bcb0cf270fdbcb6d1cbf9998e29afbfe4cbeebde)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ae22f844e2e142f6f973edd210dbc511a9dc1ef0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ae22f844e2e142f6f973edd210dbc511a9dc1ef0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3218216" author="xgen-internal-githook" created="Mon, 22 Jun 2020 19:19:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mihai Andrei&apos;, &apos;email&apos;: &apos;mihai.andrei@10gen.com&apos;, &apos;username&apos;: &apos;mtandrei&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47223&quot; title=&quot;geoNear/$geoNear does not apply index hints&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47223&quot;&gt;&lt;del&gt;SERVER-47223&lt;/del&gt;&lt;/a&gt; Verify that $geoNear applies index hint correctly&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e1d82874e90ed0cb7fd6898edc54d47c1a42b97c)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bcb0cf270fdbcb6d1cbf9998e29afbfe4cbeebde&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bcb0cf270fdbcb6d1cbf9998e29afbfe4cbeebde&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3217103" author="xgen-internal-githook" created="Mon, 22 Jun 2020 13:08:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mihai Andrei&apos;, &apos;email&apos;: &apos;mihai.andrei@10gen.com&apos;, &apos;username&apos;: &apos;mtandrei&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47223&quot; title=&quot;geoNear/$geoNear does not apply index hints&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47223&quot;&gt;&lt;del&gt;SERVER-47223&lt;/del&gt;&lt;/a&gt; Verify that $geoNear applies index hint correctly&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e1d82874e90ed0cb7fd6898edc54d47c1a42b97c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e1d82874e90ed0cb7fd6898edc54d47c1a42b97c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3021597" author="justin.seyster" created="Wed, 1 Apr 2020 18:43:05 +0000"  >&lt;p&gt;Yes, definitely a bug, and one that probably affects master.&lt;/p&gt;

&lt;p&gt;Actually, it looks like it&apos;s three distinct bugs. In 4.0, a $geoNear DocumentSource operates by dispatching a geoNear command, but it neglects to forward its hint. Furthermore, the geoNear command-&lt;del&gt;when it does have a hint&lt;/del&gt;-fails to forward its hint to the query planner. Both of those code paths were removed in 4.2, though, and replaced by a new $geoNear DocumentSource.&lt;/p&gt;

&lt;p&gt;Unfortunately, that new code path also seems to have an error (that we have not yet diagnosed) that prevents it from using its hint, meaning that this bug also affects 4.2 and probably 4.4 and master as well.&lt;/p&gt;

&lt;p&gt;We will probably want to schedule this for 4.5 and backport to 4.4 and 4.2. If we wanted to correct this behavior on 4.0, we would need to write a new fix.&lt;/p&gt;</comment>
                            <comment id="3021000" author="asya" created="Wed, 1 Apr 2020 14:14:14 +0000"  >&lt;p&gt;Isn&#8217;t it a bug that we discard incompatible hint?   Generally we either use the index hinted or error. &lt;/p&gt;</comment>
                    </comments>
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