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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-19679] Presence of pipe &apos;|&apos; is search causes all keys to be examined</title>
                <link>https://jira.mongodb.org/browse/SERVER-19679</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There appears to be a regression with how the query processor handles the pipe character &apos;|&apos;. In version 3.0.4, regular queries using the pipe character scan all entries in the index. In version 2.6.9, regular queries using the pipe character DO NOT scan all entries in the index. &lt;/p&gt;</description>
                <environment></environment>
        <key id="223505">SERVER-19679</key>
            <summary>Presence of pipe &apos;|&apos; is search causes all keys to be examined</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="-1">Unassigned</assignee>
                                    <reporter username="steven.hand">Steven Hand</reporter>
                        <labels>
                    </labels>
                <created>Thu, 30 Jul 2015 21:20:26 +0000</created>
                <updated>Thu, 30 Jul 2015 21:30:16 +0000</updated>
                            <resolved>Thu, 30 Jul 2015 21:30:02 +0000</resolved>
                                    <version>3.0.4</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="993369" author="rassi@10gen.com" created="Thu, 30 Jul 2015 21:30:02 +0000"  >&lt;p&gt;I can confirm that this ticket is a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16622&quot; title=&quot;RegEx query predicates using the | (vertical bar) character cannot use tight index bounds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16622&quot;&gt;SERVER-16622&lt;/a&gt;.  Closing this ticket as such.&lt;/p&gt;</comment>
                            <comment id="993367" author="steven.hand" created="Thu, 30 Jul 2015 21:27:32 +0000"  >&lt;p&gt;I get the same results when using the escaped pipe character, e.g. &quot;db.re.find({_id:/^1234&amp;#94;mr&amp;#94;sjc&amp;#124;ENT/}).explain(&apos;executionStats&apos;)&quot;&lt;/p&gt;</comment>
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                            <attachment id="84047" name="test_regexp-data.dump" size="801" author="steven.hand" created="Thu, 30 Jul 2015 21:20:26 +0000"/>
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	&lt;li&gt;setup system with 3.0.4
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		&lt;li&gt;mongo shell&lt;/li&gt;
		&lt;li&gt;import enclosed dump file&lt;/li&gt;
		&lt;li&gt;run &quot;db.re.find({_id:/^\Q1234^mr^sjc|ENT\E/}).explain(&apos;executionStats&apos;)&quot;&lt;/li&gt;
		&lt;li&gt;check the &quot;totalKeysExamined&quot; field in output, should be 2 but is 9&lt;/li&gt;
		&lt;li&gt;run &quot;db.re.find({_id:/^\Q1234^mr^sjc\E/}).explain(&apos;executionStats&apos;)&quot;&lt;/li&gt;
		&lt;li&gt;check the &quot;totalKeysExamined&quot; field in output&lt;/li&gt;
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	&lt;li&gt;setup system with 2.6.9
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		&lt;li&gt;import enclosed dump file&lt;/li&gt;
		&lt;li&gt;run &quot;db.re.find({_id:/^\Q1234^mr^sjc|ENT\E/}).explain(&apos;executionStats&apos;)&quot;&lt;/li&gt;
		&lt;li&gt;check the &quot;nscanned&quot; field in output, should be 2 but is 9&lt;/li&gt;
		&lt;li&gt;run &quot;db.re.find({_id:/^\Q1234^mr^sjc\E/}).explain(&apos;executionStats&apos;)&quot;&lt;/li&gt;
		&lt;li&gt;check the &quot;nscanned&quot; field in output&lt;/li&gt;
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