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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-1454] Use $not as a top-level logical op</title>
                <link>https://jira.mongodb.org/browse/SERVER-1454</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In our MongoDB-CSharp driver we convert code expressions like that to documents queries.&lt;/p&gt;

&lt;p/&gt;
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			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;The problem here is that the ! operator reverses the meaning of both equality checks. This scenario would be much easier to accomplish when we could use the $not operator like the $or operator. &lt;/p&gt;

&lt;p&gt;Example:&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;{ $not : [ &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;    { &quot;Address.IsDefault&quot; : true },&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;    { &quot;Address.Name&quot; : &quot;foo&quot; }&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;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;I think also that this is more the way the users expect to use the $not operator.&lt;/p&gt;</description>
                <environment></environment>
        <key id="12498">SERVER-1454</key>
            <summary>Use $not as a top-level logical op</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="lanwin">Steve Wagner</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Jul 2010 07:56:47 +0000</created>
                <updated>Tue, 6 Dec 2022 05:48:51 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>17</votes>
                                    <watches>21</watches>
                                                                                                                <comments>
                            <comment id="4242154" author="JIRAUSER1260908" created="Sat, 11 Dec 2021 04:40:02 +0000"  >
&lt;p&gt;Hi Joe&lt;br/&gt;
I understand from Jacob this is not something we can do until we support&lt;br/&gt;
CST ( new parser for our optimizer ), that likely won&apos;t come until late&lt;br/&gt;
next year&lt;br/&gt;
I suggest we just file this back into our general backlog instead of moving&lt;br/&gt;
it from sprint to sprint&lt;/p&gt;

&lt;p&gt;Thx&lt;br/&gt;
Steve&lt;/p&gt;
</comment>
                            <comment id="3658761" author="JIRAUSER1258247" created="Thu, 11 Mar 2021 12:29:56 +0000"  >&lt;p&gt;A WIP code review.&lt;/p&gt;</comment>
                            <comment id="3633509" author="charlie.swanson" created="Wed, 24 Feb 2021 19:36:56 +0000"  >&lt;p&gt;I uploaded&#160;&lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/301643/301643_top_level_not.patch&quot; title=&quot;top_level_not.patch attached to SERVER-1454&quot;&gt;top_level_not.patch&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;&#160;as a place to start here. It&apos;s not well tested but it proves that it shouldn&apos;t be crazy difficult. One thing I noticed that we&apos;d probably want to fix here: the way we serialize NOT is pretty backwards right now. Our code parses something like&#160;&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;   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;{x: {$not: {$gt: 4}}}&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;into a MatchExpression tree with NOT -&amp;gt; GT(x, 4). Then it has to extract the &quot;x&quot; and serialize back to the original. So there&apos;s some finicky code to try to search within a $not sub-tree to find the path. All of that can probably be removed if we allow $not to be top-level. I would proceed with caution here because it&apos;s been a source of some bugs. I&apos;m not sure why we didn&apos;t just allow this syntax for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43349&quot; title=&quot;Incorrect serialization for $elemMatch $not $ne&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43349&quot;&gt;&lt;del&gt;SERVER-43349&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39019&quot; title=&quot;$elemMatch $ne serialization is incorrect, doesn&amp;#39;t roundtrip&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39019&quot;&gt;&lt;del&gt;SERVER-39019&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;It could be related to upgrade/downgrade concerns. If we start serializing in a new format, we need to make sure everyone in the cluster understands that format. For mongos this shouldn&apos;t be a problem because mongos is the last to be upgraded, but we do send queries from shard to shard for cases like $merge. In these cases we&apos;ll need to make sure we&apos;re on the upgraded FCV before using the new serialization format - which would cause us to keep around the old serialization code, at least for one major release.&lt;br/&gt;
&#160;&lt;/p&gt;</comment>
                            <comment id="3607981" author="charlie.swanson" created="Tue, 9 Feb 2021 22:00:46 +0000"  >&lt;p&gt;I&apos;m nominating this as quick win because I have no reason to suspect it&apos;s all that hard and it would simplify some of the language building efforts on the drivers side.&lt;/p&gt;</comment>
                            <comment id="1237626" author="asya" created="Fri, 15 Apr 2016 20:32:38 +0000"  >&lt;p&gt;Equivalent of top level $not that already works now would be {$nor: [ { original-query } ] }&lt;/p&gt;</comment>
                            <comment id="1116818" author="meugen" created="Thu, 17 Dec 2015 06:53:14 +0000"  >&lt;p&gt;To Robert Stam: &lt;br/&gt;
Yes. Transformation should support the law of de Morgan . Which is not ambiguous because it law )&lt;/p&gt;

&lt;p&gt;For MongoDB-developers, I think, the ambiguity or complexity would not be at all. Since they will only take those objects that do not fall under a set of conditions shown in $ not: {}.&lt;/p&gt;</comment>
                            <comment id="1116814" author="meugen" created="Thu, 17 Dec 2015 06:32:35 +0000"  >&lt;p&gt;it will be a very good feature!&lt;br/&gt;
For example: i take conditions from admins, in wich case they dont see documents. And witout this feature i create in aggreagte.project() FOR ALL DOCUMENTS computed fields with false to prohibited fields and THEN match all documents for computed field == true. &lt;br/&gt;
It works very slowly!   (&lt;/p&gt;

&lt;p&gt;PS in my example i need to ADD ALL FIELDS in project! Automotically it imposible and i use &quot;fields: &quot;$$ROOT&quot;&quot;, then i need to exclude this new level (named &quot;fields&quot;).... This is unnormal way! (&lt;/p&gt;</comment>
                            <comment id="874535" author="rstam" created="Tue, 7 Apr 2015 14:14:28 +0000"  >&lt;p&gt;I think $not should take a single argument, otherwise it can be rather ambiguous what it means (does De Morgan&apos;s Law apply or not?).&lt;/p&gt;

&lt;p&gt;The example in the description could be represented unambiguously as:&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;
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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;  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;{ $not : &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;    { $and : [&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;        { &quot;Address.IsDefault&quot; : true },&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;        { &quot;Address.Name&quot; : &quot;foo&quot; }&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;    ] } &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="21940" author="nehresma" created="Thu, 30 Dec 2010 15:34:45 +0000"  >&lt;p&gt;I have a situation where expanded $not support would be very useful.  We have a query builder to let the user build complex expressions that are then translated into a MongoDB query and executed.&lt;/p&gt;</comment>
                            <comment id="16005" author="eliot" created="Wed, 21 Jul 2010 12:11:27 +0000"  >&lt;p&gt;When we prioritize this will depend on # of votes primarily. &lt;/p&gt;</comment>
                            <comment id="16004" author="lanwin" created="Wed, 21 Jul 2010 10:35:59 +0000"  >&lt;p&gt;I would really like to know if you consider adding this or not soon.&lt;/p&gt;</comment>
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