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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-2222] notablescan mode neglects to fail some table scan queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-2222</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;These are just the cases I&apos;ve run into, possibly there are more:&lt;/p&gt;

&lt;p&gt;t.find( {} );&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;uses a table scan without generating an exception&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;t.find( ... );&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;if the table is empty, no table scan exception is generated&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;t.count( &lt;/p&gt;
{a:1}
&lt;p&gt; );&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;seems to return 0 and not raise a js error (though last error appears to be set) - possibly this is just an issue with js count wrapper&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Maybe we want to allow some of these cases, but if so we should document that fact.&lt;/p&gt;</description>
                <environment></environment>
        <key id="13964">SERVER-2222</key>
            <summary>notablescan mode neglects to fail some table scan queries</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>
                        <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="aaron">Aaron Staple</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Tue, 14 Dec 2010 18:45:32 +0000</created>
                <updated>Wed, 3 Jan 2024 14:48:52 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="88116" author="dwight_10gen" created="Tue, 14 Feb 2012 02:42:39 +0000"  >&lt;p&gt;commit 338ef8c94b9677242a52e8855eecbfc449c9da76&lt;br/&gt;
Author: dwight &amp;lt;dwight@10gen.com&amp;gt;&lt;br/&gt;
Date:   Mon Feb 13 21:40:21 2012 -0500&lt;/p&gt;

&lt;p&gt;    slight improvement in noTableScan code&lt;/p&gt;</comment>
                            <comment id="81555" author="aaron" created="Mon, 23 Jan 2012 02:46:04 +0000"  >&lt;p&gt;An issue with notablescan namespace whitelist matching&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;        if ( strstr( ns() , &quot;.system.&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;            strstr( ns() , &quot;local.&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;            return;&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;The pattern matching should be more precise to prevent table scans from sneaking through on namespaces like &apos;my_local.foo&apos;.  Also not clear that all local namespaces should be in the whitelist.&lt;/p&gt;</comment>
                            <comment id="67726" author="colinhowe" created="Sat, 19 Nov 2011 12:16:03 +0000"  >&lt;blockquote&gt;
&lt;p&gt;t.find( ... );&lt;/p&gt;

&lt;p&gt;if the table is empty, no table scan exception is generated&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;As a user of the table scan exception functionality my initial thought was that this case is the correct behaviour. However, if there were to be any rows than this would be a table scan. Advance warning of this on an empty table would be useful!&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="14087">SERVER-2291</issuekey>
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            <issuekey id="21535">SERVER-3692</issuekey>
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            <issuekey id="237898">SERVER-21302</issuekey>
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            <issuekey id="25133">SERVER-4327</issuekey>
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