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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-6542] query optimizer does not consider query plans for $and:[$or:[conditions]]</title>
                <link>https://jira.mongodb.org/browse/SERVER-6542</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have 2 sets of &quot;ored&quot; conditions because I need all rows that meet conditions A or B or C, and that also meet conditions D or E or F.&lt;br/&gt;
Since I can only have a single $or statement, I use this:&lt;br/&gt;
$or:[&lt;/p&gt;
{A}
&lt;p&gt;,&lt;/p&gt;
{B}
&lt;p&gt;,&lt;/p&gt;
{C}
&lt;p&gt;],$and[{$or:[&lt;/p&gt;
{D}
&lt;p&gt;,&lt;/p&gt;
{E}
&lt;p&gt;,&lt;/p&gt;
{F}
&lt;p&gt;]}]&lt;br/&gt;
This returns the correct results, and by the way, uses indexes on A, B and C and runs in parallel, which is fantastic (good job!!!).&lt;br/&gt;
However, if my indexes on D,E and F are even better choices than A,B and C, let&apos;s say they have better selectivity, the query optimizer completely ignores them as viable plans. Moreover, there is no way for me to give a hint to use them, because hint can only take a single index. Even if I had a combined index on D_E_F and passed it as a hint, it would not help because the query on E and on F would not be able to use it.&lt;/p&gt;

&lt;p&gt;I think we need either a mechanism to specify multiple first level $ors (I know JS does not make it easy) or a smarter query optimizer that considers more alternatives, even if they are hidden inside an $and.&lt;/p&gt;</description>
                <environment>any</environment>
        <key id="44967">SERVER-6542</key>
            <summary>query optimizer does not consider query plans for $and:[$or:[conditions]]</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="aaron">Aaron Staple</assignee>
                                    <reporter username="arie@klip.com">Arie Grapa</reporter>
                        <labels>
                    </labels>
                <created>Fri, 20 Jul 2012 21:41:30 +0000</created>
                <updated>Fri, 7 Mar 2014 00:57:51 +0000</updated>
                            <resolved>Tue, 26 Feb 2013 20:13:15 +0000</resolved>
                                    <version>2.0.6</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="276466" author="aaron" created="Tue, 26 Feb 2013 20:12:41 +0000"  >&lt;p&gt;Hi Arie - This is &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3327&quot; title=&quot;use indexes for nested $or clauses&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3327&quot;&gt;&lt;del&gt;SERVER-3327&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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