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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>
    </build-info>


<item>
            <title>[SERVER-43989] Regex query not matching correctly on compound index</title>
                <link>https://jira.mongodb.org/browse/SERVER-43989</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi&#160; there,&lt;/p&gt;

&lt;p&gt;The problem is that when running a reqex query on a field indexed by a compound index, the&#160;&lt;b&gt;IXSCAN&lt;/b&gt; stage incorrectly passes&#160;&lt;b&gt;all&lt;/b&gt; the documents in the collection onto the next&#160;&lt;b&gt;FETCH&lt;/b&gt; stage, which has to filter them all over again, resulting in a really slow execution of a what had to be a very fast query.&#160;&lt;/p&gt;

&lt;p&gt;The strange this is that if we alter the regex query with a&#160;&lt;b&gt;^&lt;/b&gt;&#160;or&#160;&lt;b&gt;&amp;amp;&lt;/b&gt; Regular expression restricting character it works correctly.&lt;/p&gt;

&lt;p&gt;Also, if you have a single index using the queried field, issuing the same regex query , works as expected.&lt;/p&gt;

&lt;p&gt;&lt;em&gt;Please note that the field is first on the compound index, so it should behave as a single one.&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;&lt;em&gt;Example details given below as steps to reproduce&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="968947">SERVER-43989</key>
            <summary>Regex query not matching correctly on compound index</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="eric.sedor@mongodb.com">Eric Sedor</assignee>
                                    <reporter username="d.halatsis@centaur.ag">Dimitris Xalatsis</reporter>
                        <labels>
                    </labels>
                <created>Mon, 14 Oct 2019 15:46:01 +0000</created>
                <updated>Mon, 28 Oct 2019 16:14:53 +0000</updated>
                            <resolved>Mon, 28 Oct 2019 16:14:53 +0000</resolved>
                                    <version>3.6.14</version>
                                                    <component>Index Maintenance</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="2505078" author="eric.sedor" created="Mon, 28 Oct 2019 16:14:37 +0000"  >&lt;p&gt;No need to apologize &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=d.halatsis%40centaur.ag&quot; class=&quot;user-hover&quot; rel=&quot;d.halatsis@centaur.ag&quot;&gt;d.halatsis@centaur.ag&lt;/a&gt;; Please watch that ticket for updates!&lt;/p&gt;</comment>
                            <comment id="2501996" author="d.halatsis@centaur.ag" created="Sat, 26 Oct 2019 06:01:09 +0000"  >&lt;p&gt;Hi Eric,&#160;&lt;/p&gt;

&lt;p&gt;It turns out you are right about the behavior not being the same when using a non multi key index. I was accidentally looking into my previous executionStats results, where the number of keys in IXSCAN stage returned was the same as the total count of docs in the collection...&lt;/p&gt;

&lt;p&gt;I am really sorry for the misreport in my previous comment.&lt;/p&gt;

&lt;p&gt;So it seems, it is the same related issue!&#160;&lt;/p&gt;</comment>
                            <comment id="2501808" author="eric.sedor" created="Fri, 25 Oct 2019 21:07:09 +0000"  >&lt;p&gt;Happy to help, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=d.halatsis%40centaur.ag&quot; class=&quot;user-hover&quot; rel=&quot;d.halatsis@centaur.ag&quot;&gt;d.halatsis@centaur.ag&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Unfortunately, the cause of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29967&quot; title=&quot;The regex filter operation should be applied in the IXSCAN stage if possible &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29967&quot;&gt;SERVER-29967&lt;/a&gt; is that deduplication is performed in the IXSCAN stage before it applies the covering filter. This deduplication is required in multikey indexes even though the query does not include a filter on the field(s) that made the index multikey.&lt;/p&gt;

&lt;p&gt;We can see in &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/235028/235028_non-multikey.json&quot; title=&quot;non-multikey.json attached to SERVER-43989&quot;&gt;non-multikey.json&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; that the filter is being applied in the IXSCAN stage, in contrast to &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/233651/233651_compound_regex.json&quot; title=&quot;compound_regex.json attached to SERVER-43989&quot;&gt;compound_regex.json&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;, where it is being applied in the FETCH stage due to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29967&quot; title=&quot;The regex filter operation should be applied in the IXSCAN stage if possible &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29967&quot;&gt;SERVER-29967&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;It is certainly true that anchoring a regex is a less time and CPU-intensive operation, so we would expect an unrooted regex to be slower. Can you go into more detail on what you mean by &quot;properly uses the index&quot; if you are seeing something specific?&lt;/p&gt;</comment>
                            <comment id="2497013" author="d.halatsis@centaur.ag" created="Wed, 23 Oct 2019 08:18:39 +0000"  >&lt;p&gt;Hi&#160;@Eric Sedor, thanks for taking the time to look into this issue.&lt;/p&gt;

&lt;p&gt;I saw the issue about the regex query on multikey index but I do not think this is the same issue.&lt;/p&gt;

&lt;p&gt;First of all, you are correct about the field&#160;&lt;b&gt;data.&lt;/b&gt;&#160;It is an array containing embedded documents of the form:&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;{  sensorId: &amp;lt;string&amp;gt;, readingType: &amp;lt;string&amp;gt;, value: &amp;lt;number&amp;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;
&lt;p&gt;However, I am not using any of the embedded array document fields in my query. I am only querying on&#160;&lt;b&gt;sourceId&lt;/b&gt; which is a single string field, so it should not interfere with any of the multi key indexed fields.&lt;/p&gt;

&lt;p&gt;Secondly, please note that if I send a regex query &lt;b&gt;defining the start of the regex&lt;/b&gt; with this&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;/^0013A200418A03F7/&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;it&#160;&lt;b&gt;properly uses the index.&lt;/b&gt;&#160;*&lt;b&gt;The only diference being the&lt;/b&gt;&#160;^* character defining the start.&lt;/p&gt;

&lt;p&gt;Also to prove the case, I created in a staging copy database an index containing only the&#160;&lt;b&gt;non-multikey&lt;/b&gt; fields and issued the same query again. The same behavior is observed. So it does not seem to be a matter of the multikey indexes, but a &lt;b&gt;compound vs single&lt;/b&gt; key case conflict as I initially stated in the issue.&lt;/p&gt;

&lt;p&gt;You can find the executionStats results file&#160; here:&#160;&lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/235028/235028_non-multikey.json&quot; title=&quot;non-multikey.json attached to SERVER-43989&quot;&gt;non-multikey.json&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;&lt;/p&gt;

&lt;p&gt;So I believe it is still valid and not duplicate of the mentioned&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29967&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;29967&lt;/a&gt; issue&lt;/p&gt;</comment>
                            <comment id="2496824" author="eric.sedor" created="Wed, 23 Oct 2019 00:16:54 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=d.halatsis%40centaur.ag&quot; class=&quot;user-hover&quot; rel=&quot;d.halatsis@centaur.ag&quot;&gt;d.halatsis@centaur.ag&lt;/a&gt;, thanks for your patience.&lt;/p&gt;

&lt;p&gt;The provided explain plans show the index to be a multikey index (&lt;tt&gt;isMultiKey: true&lt;/tt&gt;), and we have &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29967&quot; title=&quot;The regex filter operation should be applied in the IXSCAN stage if possible &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29967&quot;&gt;SERVER-29967&lt;/a&gt; open to track the optimization of regex performance in this situation. You are right that an IXSCAN could theoretically be used.&lt;/p&gt;

&lt;p&gt;That said, the example document you provided doesn&apos;t include an array. If it happens to be the case that any data.readingType arrays are unintentional (or could be stored as separate documents without arrays), then you may be able to get improved performance without waiting on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29967&quot; title=&quot;The regex filter operation should be applied in the IXSCAN stage if possible &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29967&quot;&gt;SERVER-29967&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;In any case, please watch &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29967&quot; title=&quot;The regex filter operation should be applied in the IXSCAN stage if possible &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29967&quot;&gt;SERVER-29967&lt;/a&gt; for updates.&lt;/p&gt;

&lt;p&gt;Gratefully,&lt;br/&gt;
Eric&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10010">
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                                        <issuelink>
            <issuekey id="400318">SERVER-29967</issuekey>
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                <attachments>
                            <attachment id="233651" name="compound_regex.json" size="4843" author="d.halatsis@centaur.ag" created="Mon, 14 Oct 2019 15:45:53 +0000"/>
                            <attachment id="233650" name="compound_regex_restrict.json" size="4593" author="d.halatsis@centaur.ag" created="Mon, 14 Oct 2019 15:45:53 +0000"/>
                            <attachment id="235028" name="non-multikey.json" size="4308" author="d.halatsis@centaur.ag" created="Wed, 23 Oct 2019 08:18:33 +0000"/>
                            <attachment id="233649" name="single_field.json" size="5366" author="d.halatsis@centaur.ag" created="Mon, 14 Oct 2019 15:45:53 +0000"/>
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&#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;
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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;{&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;
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					&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;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Also we have a&#160;&lt;b&gt;compound&lt;/b&gt; index with the following fields:&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;{&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: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;sourceId&quot;&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; : &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&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;,&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: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;source&quot;&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; : &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&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;,&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: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;timestamp&quot;&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; : &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&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;,&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: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;data.readingType&quot;&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; : &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&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;
&lt;p&gt;&#160;&lt;br/&gt;
Issuing a query with a direct match on the &lt;b&gt;sourceId&lt;/b&gt;&#160;filter with the value&#160;&lt;b&gt;0013A200418A03F7,&lt;/b&gt;&#160;yields the expected results and the query completes in ms.&lt;/p&gt;

&lt;p&gt;However if the query is run using a regex expression:&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;db.getCollection(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;Measurement&apos;&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;).find({sourceId: /0013A200418A03F7/});&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;it takes about 50 seconds to complete on a ~6 million document database.&lt;br/&gt;
The query executionStats results file are attached as &lt;b&gt;compound_regex.json&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Running the query while restricting the start of the regular expression as this&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;db.getCollection(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;Measurement&apos;&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;).find({sourceId: /^0013A200418A03F7/});&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;filters out the documents properly using the index and the query executes quickly.&lt;br/&gt;
The executionStats results are attached as &lt;b&gt;compound_regex_restrict.json&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Finally just for proof of concept, creating a single field index on the &lt;b&gt;sourceId&lt;/b&gt; field, and running the same problematic query again&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;db.getCollection(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;Measurement&apos;&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;).find({sourceId: /0013A200418A03F7/});&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;now properly executs as it should.&lt;br/&gt;
The executionStats results are attached as &lt;b&gt;single_field.json&lt;/b&gt;&lt;/p&gt;</customfieldvalue>

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