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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-74298] Implement renaming by path component for PathMatchExpression</title>
                <link>https://jira.mongodb.org/browse/SERVER-74298</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While working on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73914&quot; title=&quot;Implement renames for kArrayMatching MatchExpressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73914&quot;&gt;&lt;del&gt;SERVER-73914&lt;/del&gt;&lt;/a&gt;, we realized that the current renaming algorithm does not support renaming by path component but we&apos;d better to since it would support more splittable and renameable match expressions and hence achieve the better optimization. For example,&lt;/p&gt;

&lt;p&gt;assuming that we have a pipeline like&lt;/p&gt;
&lt;p/&gt;
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					&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;                $map: {input: &apos;$a&apos;, as: &apos;i&apos;, in : {y: &apos;$$i.b&apos;}}&lt;/span&gt;&lt;/pre&gt;
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					&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;
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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;    {$match: {x: {y: 1}}}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;the above $match should be able to be swapped with $project because $project is a simple rename.&lt;/p&gt;

&lt;p&gt;But as of today, there are two related issues to support the above match expression.&lt;/p&gt;

&lt;p&gt;1) &lt;tt&gt;semantic_analysis::extractModifiedDependencies()&lt;/tt&gt; reports the path &apos;x&apos; as a modified dependency and call &lt;tt&gt;splitMatchExpressionBy(expr, fields = {&quot;x&quot;}, renames = {&quot;x.y&quot; -&amp;gt; &quot;a.b&quot;})&lt;/tt&gt; and hence the &lt;tt&gt;expr&lt;/tt&gt; is not splittable and cannot be swapped with $project.&lt;br/&gt;
2) &lt;tt&gt;PathMatchExpression::applyRename()&lt;/tt&gt; cannot rename sub-fields of prefix of renamed paths.&lt;/p&gt;

&lt;p&gt;We have the same issue for &lt;tt&gt;$elemMatch&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Search for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74298&quot; title=&quot;Implement renaming by path component for PathMatchExpression&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74298&quot;&gt;SERVER-74298&lt;/a&gt; for more details on what to do.&lt;/p&gt;

&lt;p&gt;Also &lt;a href=&quot;https://docs.google.com/document/d/17VVCvOGNOyVapcKvbJIrRuHwuSS1l3awhcqFJZh_igk/edit&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this note&lt;/a&gt; might be helpful.&lt;/p&gt;

&lt;p&gt;And also this analysis too:&lt;br/&gt;
Right now, the match_expression::addDependencies() that uses DependencyVisitor does not report the sub-object field paths as dependencies. &lt;a href=&quot;https://github.com/10gen/mongo/blob/38e430eb3e2ef271f958c165d5d50c38c956363e/src/mongo/db/matcher/match_expression_dependencies.cpp#L119&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/38e430eb3e2ef271f958c165d5d50c38c956363e/src/mongo/db/matcher/match_expression_dependencies.cpp#L119&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;For example, {&lt;tt&gt;d: {$elemMatch: {e: 1, f: 1&lt;/tt&gt;}} is transformed to the following tree:&lt;/p&gt;
&lt;p/&gt;
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					&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;                            $elemMatch&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;And the &lt;tt&gt;DependencyVisitor&lt;/tt&gt; reports only &#8220;d&#8221; as the dependency, neither &#8220;d.e&#8221; nor &#8220;d.f&#8221;. So, if &#8220;d.e&#8221; and &#8220;d.f&#8221; happen to be renamed paths from &#8220;a.b&#8221; and &#8220;a.c&#8221; by the previous $project stage, for example,&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{{{$project: {d: {$map: {input: &quot;$a&quot;, as: &quot;i&quot;, in: {e: &quot;$$i.b&quot;, f: &quot;$$i.c&quot;}}}}}&lt;/span&gt;&lt;/pre&gt;
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					&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;{{{$match: {d: {$elemMatch: {e: 1, f: 1}}}}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;The $project reports renamed paths &lt;tt&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;\{d.e, a.b}, \{d.f, a.c}&amp;#93;&lt;/span&gt;&lt;/tt&gt; but the &lt;tt&gt;DependencyVisitor&lt;/tt&gt; only reports &#8220;d&#8221; as the dependency. So, we should not be able to rename &#8220;d.e&#8221; and &#8220;d.f&#8221; because &#8220;d&#8221; itself is neither a renamed nor preserved path and hence considered as a modified path by &lt;tt&gt;extractModifiedDependencies()&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;I noticed that &#8220;d.e&#8221; and &#8220;d.f&#8221; are also not renameable in the following example:&lt;/p&gt;
&lt;p/&gt;
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					&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;{$project: {d: {$map: {input: &quot;$a&quot;, as: &quot;i&quot;, in: {e: &quot;$$i.b&quot;, f: &quot;$$i.c&quot;}}}}}&lt;/span&gt;&lt;/pre&gt;
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					&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;{$match: {d: {e: 1, f: 1}}}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;The {&lt;tt&gt;d: {e: 1, f: 1&lt;/tt&gt;}} is transformed to the following tree:&lt;/p&gt;
&lt;p/&gt;
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					&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;                                $eq&lt;/span&gt;&lt;/pre&gt;
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					&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;
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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;   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;                              d  {e: 1, f: 1}&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Interestingly enough, {&lt;tt&gt;e: 1, f: 1&lt;/tt&gt;} is not transformed to an $and expression at all. So, even though we have $elemMatch object expression renameable by sub path component, we would still have an issue with $eq match against an object.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2272905">SERVER-74298</key>
            <summary>Implement renaming by path component for PathMatchExpression</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>
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                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="yoonsoo.kim@mongodb.com">Yoon Soo Kim</reporter>
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                <created>Thu, 23 Feb 2023 02:24:18 +0000</created>
                <updated>Fri, 12 May 2023 15:37:29 +0000</updated>
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