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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-45123] Queries should not fail with type error when $type provides the correct filter</title>
                <link>https://jira.mongodb.org/browse/SERVER-45123</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;h6&gt;&lt;a name=&quot;OriginalSummary&quot;&gt;&lt;/a&gt;Original Summary&lt;/h6&gt;
&lt;p&gt;$and does not short-circuit&lt;/p&gt;

&lt;h6&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h6&gt;
&lt;p&gt;I think this is a bug. Check the &quot;Steps To Reproduce&quot;. The interesting thing is that if one of the two expressions in the `$or` part is removed, then the query executes fine. Otherwise it leads to `$in requires an array as a second argument, found: objectId`.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1051885">SERVER-45123</key>
            <summary>Queries should not fail with type error when $type provides the correct filter</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="13202">Works as Designed</resolution>
                                        <assignee username="jacob.evans@mongodb.com">Jacob Evans</assignee>
                                    <reporter username="alien">Boris Petrov</reporter>
                        <labels>
                            <label>qopt-team</label>
                    </labels>
                <created>Fri, 13 Dec 2019 13:15:17 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:59 +0000</updated>
                            <resolved>Wed, 18 Dec 2019 17:30:52 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2643866" author="jacob.evans" created="Wed, 18 Dec 2019 17:29:45 +0000"  >&lt;p&gt;Hi Boris,&lt;/p&gt;

&lt;p&gt;Thanks for helping us find an error in our docs! Like most other query languages, MongoDB does not actually support short-circuiting. In general you cannot rely on predicates being executed in a certain order and you cannot rely on predicates being skipped. In this case all predicates are put in a canonical order within the filter. The two arms of the $and are considered separate predicates. This is done to index the query into the plan cache so that other queries with the same predicates will find the cache member. Further optimization may reorder the predicates further, for example to enable the use of an index.&lt;/p&gt;

&lt;p&gt;I&apos;ve created a documentation ticket to correct the claim that we perform short-circuit evaluation: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13309&quot; title=&quot;MongoDB does not guarantee short circuit evaluation and it should not be mentioned&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13309&quot;&gt;&lt;del&gt;DOCS-13309&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;In addition I&apos;ve created a ticket to track a feature request to define an evaluation order for specific predicates since you&apos;ve demonstrated that this could be useful: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45231&quot; title=&quot;Provide a way to cause a well-defined order of evaluation for predicates&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45231&quot;&gt;&lt;del&gt;SERVER-45231&lt;/del&gt;&lt;/a&gt;. Please feel free to follow up there.&lt;/p&gt;

&lt;p&gt;Thanks again for pointing this out.&lt;/p&gt;</comment>
                            <comment id="2634683" author="carl.champain" created="Mon, 16 Dec 2019 18:27:58 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alien&quot; class=&quot;user-hover&quot; rel=&quot;alien&quot;&gt;alien&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the clarification! &lt;br/&gt;
I&apos;m passing this ticket along to the Query team for further investigation. &lt;/p&gt;</comment>
                            <comment id="2634385" author="alien" created="Mon, 16 Dec 2019 16:34:19 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;Thanks for the answer.&lt;/p&gt;

&lt;p&gt;Well, the actual issue is exactly as I&apos;ve stated in the title - that I expect short-circuiting when using `$and`. I&apos;m generating queries dynamically (so I cannot add an index because I don&apos;t know the queried property) and I want to filter by using `$in` but only when the right-side is an array (as otherwise Mongo blows up with the said error). In the documentation of `$and` it is written that it short-circuits and I would expect my query to be executed in order and the query optimizer to not rearrange it. If that&apos;s not the case, the documentation has to be fixed.&lt;/p&gt;

&lt;p&gt;In any case I already worked-around this, now it&apos;s a matter of just fixing the bug in Mongo.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;/p&gt;

&lt;p&gt;Boris&lt;/p&gt;</comment>
                            <comment id="2633921" author="carl.champain" created="Mon, 16 Dec 2019 14:06:54 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alien&quot; class=&quot;user-hover&quot; rel=&quot;alien&quot;&gt;alien&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the report.&lt;/p&gt;

&lt;p&gt;Can you please clarify what the actual issue is for you? In other words, how does it impact you?&lt;/p&gt;

&lt;p&gt;After recreating your example, I noticed, in the winningPlan explain output, that the execution of the query selectors starts with &lt;tt&gt;$or&lt;/tt&gt; and then examines &lt;tt&gt;$type&lt;/tt&gt;. That&apos;s why you encounter that error message: &lt;tt&gt;$type&lt;/tt&gt; is applied after &lt;tt&gt;$or&lt;/tt&gt;, so the value of &lt;tt&gt;$x&lt;/tt&gt;&#160;in &lt;tt&gt;$in&lt;/tt&gt; is &lt;tt&gt;3&lt;/tt&gt; and &lt;tt&gt;3&lt;/tt&gt; is a double.&lt;/p&gt;

&lt;p&gt;A workaround could be to add the following index:&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;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;db.objects.createIndex({x:1})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;
&lt;p&gt;This will guarantee the order of the query selectors and remove the error message. The query will first do an index scan on &lt;tt&gt;x&lt;/tt&gt; and will apply &lt;tt&gt;$type&lt;/tt&gt; to filter out the result, then the query will find the documents (already filtered) that matches&#160;&lt;tt&gt;y&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
 Carl&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="616200">SERVER-37530</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1059618">DOCS-13309</issuekey>
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            <issuelink>
            <issuekey id="1059612">SERVER-45231</issuekey>
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&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;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.objects.find(&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;    { $and: [&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;        { x: { $type: 4 } },&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;        { $or: [&lt;/span&gt;&lt;/pre&gt;
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