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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-29739] Cursor array access does not work reliably</title>
                <link>https://jira.mongodb.org/browse/SERVER-29739</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The MongoDB shell supports accessing a cursor&apos;s elements via array access, without first converting the cursor into an array: db.items.find(...)&lt;span class=&quot;error&quot;&gt;&amp;#91;0&amp;#93;&lt;/span&gt;&lt;br/&gt;
However, this might return &apos;undefined&apos; even when the cursor actually contains elements.&lt;br/&gt;
I attached a script that demonstrates the issue. &lt;/p&gt;

&lt;p&gt;Some notes:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The problem disappears when using the toArray-function.&lt;/li&gt;
	&lt;li&gt;Direct array access on a cursor seems to be not documented. However, because it is so intuitive and works in most cases, it is probably often used.&lt;/li&gt;
	&lt;li&gt;When running into the issue, the shell seems to be in an inconsistent state. As the &apos;inconsistent.js&apos; script demonstrates, an if-clause with identical &apos;then&apos; and &apos;else&apos; branches might return different results depending on the condition.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="395932">SERVER-29739</key>
            <summary>Cursor array access does not work reliably</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="3">Duplicate</resolution>
                                        <assignee username="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="martinaltmayer">Martin Altmayer</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Jun 2017 08:06:13 +0000</created>
                <updated>Mon, 29 Jan 2018 18:34:40 +0000</updated>
                            <resolved>Thu, 17 Aug 2017 18:43:16 +0000</resolved>
                                    <version>3.3.5</version>
                    <version>3.4.3</version>
                                                    <component>JavaScript</component>
                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1602004" author="thomas.schubert" created="Tue, 20 Jun 2017 19:17:54 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=martinaltmayer&quot; class=&quot;user-hover&quot; rel=&quot;martinaltmayer&quot;&gt;martinaltmayer&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for reporting this issue, and providing very clear reproduction steps. This change of behavior appears to be result of an upgrade to SpiderMonkey, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23358&quot; title=&quot;Upgrade SpiderMonkey to 45.0.2 ESR&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23358&quot;&gt;&lt;del&gt;SERVER-23358&lt;/del&gt;&lt;/a&gt;. We&apos;ll continue to update this ticket as we investigate.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="408924">SERVER-30362</issuekey>
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                                        <issuelink>
            <issuekey id="408924">SERVER-30362</issuekey>
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            <issuekey id="275180">SERVER-23358</issuekey>
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                <attachments>
                            <attachment id="159111" name="find_items_without_reviews.js" size="286" author="martinaltmayer" created="Tue, 20 Jun 2017 07:58:11 +0000"/>
                            <attachment id="159110" name="inconsistent.js" size="602" author="martinaltmayer" created="Tue, 20 Jun 2017 07:58:11 +0000"/>
                            <attachment id="159112" name="prepare.js" size="125" author="martinaltmayer" created="Tue, 20 Jun 2017 07:48:47 +0000"/>
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                            <customfieldvalue>&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Execute prepare.js&lt;/li&gt;
&lt;/ul&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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;for&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; (i=1; i&amp;lt;=2500; i++) {&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.items.insert({_id: i});&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;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;if&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; (i % 2) {&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.reviews.insert({ item_id: i });&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;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Note that a review is created for every odd item.&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Execute find_items_without_reviews.js. This script should return a list with all even numbers from 2 to 2500 because exactly the even items do not have an associated review. However, the actual result is &lt;span class=&quot;error&quot;&gt;&amp;#91;2, 4, 6, ..., 1998, 2000, 2001, 2002, 2003, ..., 2499, 2500&amp;#93;&lt;/span&gt;, i.e. starting with 2001 also all odd numbers are returned.&lt;/li&gt;
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