MarkLogic 10 Product Documentation
xdmp:plan

xdmp:plan(
   $expression as item()*,
   [$maximum as xs:double?]
) as element()

Summary

Returns an XML element recording information about how the given expression will be processed by the index. The information is a structured representation of the information provided in the error log when query trace is enabled. The query will be processed up to the point of getting an estimate of the number of fragments returned by the index.

Parameters
expression The expression to estimate. This must be a partially searchable XPath expression or a cts:search() expression.
maximum The maximum value to return. Stop selecting fragments if this number is reached.

Required Privileges

http://marklogic.com/xdmp/privileges/xdmp-plan

Usage Notes

The output from xdmp:plan will vary depending on various index settings.

Running an xdmp:plan on a search is similar to running an xdmp:estimate on a search, but it returns a report on the search instead of just an estimate. As part of the report, the qry:result element includes the estimate. If the search expression argument cannot be run in the plan because it is not partially searchable, then an XDMP-UNSEARCHABLE exception is returned as part of the xdmp:plan output.

If you are running a search using the search API (for example, search:search), use the option <return-plan>true</return-plan> in your search API options node.

Example

xquery version "1.0-ml";

xdmp:plan(cts:search(fn:doc(),cts:word-query("cat")))
   =>
<qry:query-plan xmlns:qry="http://marklogic.com/cts/query">
  <qry:expr-trace>xdmp:eval("xquery version &amp;quot;1.0-ml&amp;quot;;&amp;
     #10;&amp;#10;xdmp:plan(cts:search...", (), &lt;options
     xmlns="xdmp:eval"&gt;&lt;database&gt;8855151527276563827&lt;/database&gt;
     &lt;isolation&gt;different-tra...&lt;/options&gt;)
  </qry:expr-trace>
  <qry:info-trace>Analyzing path for search: fn:doc()</qry:info-trace>
  <qry:info-trace>Step 1 is searchable: fn:doc()</qry:info-trace>
  <qry:info-trace>Path is fully searchable.</qry:info-trace>
  <qry:info-trace>Gathering constraints.</qry:info-trace>
  <qry:word-trace text="cat">
    <qry:key>12545744176132597186</qry:key>
  </qry:word-trace>
    <qry:info-trace>Search query contributed 1 constraint:
        cts:word-query("cat", ("lang=en"), 1)
    </qry:info-trace>
  <qry:partial-plan>
    <qry:term-query weight="1">
      <qry:key>12545744176132597186</qry:key>
      <qry:annotation>word("cat")</qry:annotation>
    </qry:term-query>
  </qry:partial-plan>
  <qry:info-trace>Executing search.</qry:info-trace>
  <qry:final-plan>
    <qry:and-query>
      <qry:term-query weight="1">
        <qry:key>12545744176132597186</qry:key>
        <qry:annotation>word("cat")</qry:annotation>
      </qry:term-query>
    </qry:and-query>
  </qry:final-plan>
  <qry:info-trace>Selected 1 fragment to filter</qry:info-trace>
  <qry:result estimate="1"/>
</qry:query-plan>

Example

xquery version "1.0-ml" ;

xdmp:plan(
 cts:search(/document,
   cts:word-query("cut?",
    ("unstemmed", "wildcarded") ) ) )
(:
The <qry:expansion-trace> element indicates that a
lexicon expansion occurred on the wildcarded query
(word searches, three character searches and
a codepoint lexicon are enabled in the database
configuration for wildcard queries).  The
<qry:expansion> element shows what term(s) the
lexicon expansion found.  In this case, "cut?"
expands to "cute".
:)
=>
<qry:query-plan xmlns:qry="http://marklogic.com/cts/query">
  <qry:info-trace>Analyzing path for search: fn:collection()/document
  </qry:info-trace>
  <qry:info-trace>Step 1 is searchable: fn:collection()</qry:info-trace>
  <qry:info-trace>Step 2 is searchable: document</qry:info-trace>
  <qry:info-trace>Path is fully searchable.</qry:info-trace>
  <qry:info-trace>Gathering constraints.</qry:info-trace>
  <qry:expansion-trace type="full" elapsed-time="PT0.000381S" text="cut?"
  counts="1">
    <qry:interval lowerbound="CUT" upperbound="C??"/>
    <qry:interval lowerbound="cUT" upperbound="c??"/>
    <qry:interval lowerbound="}UT" upperbound="???"/>
    <qry:expansion text="cute"/>
  </qry:expansion-trace>
  <qry:word-trace text="cute">
    <qry:key>16588943567160478160</qry:key>
  </qry:word-trace>
  <qry:info-trace>Search query contributed 1 constraint:
  cts:word-query("cut?", ("unstemmed","wildcarded","lang=en"), 1)
  </qry:info-trace>
  <qry:partial-plan>
    <qry:term-query weight="1">
      <qry:key>16588943567160478160</qry:key>
      <qry:annotation>word("cute")</qry:annotation>
    </qry:term-query>
  </qry:partial-plan>
  <qry:info-trace>Executing search.</qry:info-trace>
  <qry:final-plan>
    <qry:and-query>
      <qry:or-two-queries>
	<qry:term-query weight="0">
	  <qry:key>3998944933214536873</qry:key>
	  <qry:annotation>doc-root(element(document),doc-kind(document))
	</qry:annotation>
	</qry:term-query>
	<qry:term-query weight="0">
	  <qry:key>13616698357625443361</qry:key>
	  <qry:annotation>link-child(descendant(doc-root(element(document),
	     doc-kind(document)) ))
	</qry:annotation>
	</qry:term-query>
      </qry:or-two-queries>
      <qry:term-query weight="1">
	<qry:key>16588943567160478160</qry:key>
	<qry:annotation>word("cute")</qry:annotation>
      </qry:term-query>
    </qry:and-query>
  </qry:final-plan>
  <qry:info-trace>Selected 1 fragment to filter</qry:info-trace>
  <qry:result estimate="1"/>
</qry:query-plan>
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