arangodb/Documentation/Examples/geoIndexSortOptimization.generated

arangosh&gt; db.geoSort.ensureIndex({ <span class="hljs-attr">type</span>: <span class="hljs-string">"geo"</span>, <span class="hljs-attr">fields</span>: [ <span class="hljs-string">"latitude"</span>, <span class="hljs-string">"longitude"</span> ] });
{ 
  <span class="hljs-string">"constraint"</span> : <span class="hljs-literal">false</span>, 
  <span class="hljs-string">"fields"</span> : [ 
    <span class="hljs-string">"latitude"</span>, 
    <span class="hljs-string">"longitude"</span> 
  ], 
  <span class="hljs-string">"id"</span> : <span class="hljs-string">"geoSort/35146"</span>, 
  <span class="hljs-string">"ignoreNull"</span> : <span class="hljs-literal">true</span>, 
  <span class="hljs-string">"isNewlyCreated"</span> : <span class="hljs-literal">true</span>, 
  <span class="hljs-string">"sparse"</span> : <span class="hljs-literal">true</span>, 
  <span class="hljs-string">"type"</span> : <span class="hljs-string">"geo2"</span>, 
  <span class="hljs-string">"unique"</span> : <span class="hljs-literal">false</span>, 
  <span class="hljs-string">"code"</span> : <span class="hljs-number">201</span> 
}
arangosh&gt; <span class="hljs-keyword">for</span> (i = <span class="hljs-number">-90</span>;  i &lt;= <span class="hljs-number">90</span>;  i += <span class="hljs-number">10</span>) {
........&gt;     <span class="hljs-keyword">for</span> (j = <span class="hljs-number">-180</span>; j &lt;= <span class="hljs-number">180</span>; j += <span class="hljs-number">10</span>) {
........&gt;         db.geoSort.save({ <span class="hljs-attr">name</span> : <span class="hljs-string">"Name/"</span> + i + <span class="hljs-string">"/"</span> + j, <span class="hljs-attr">latitude</span> : i, <span class="hljs-attr">longitude</span> : j });
........&gt;     }
........&gt; }
arangosh&gt; <span class="hljs-keyword">var</span> query = <span class="hljs-string">"FOR doc in geoSort SORT DISTANCE(doc.latitude, doc.longitude, 0, 0) LIMIT 5 RETURN doc"</span>
arangosh&gt; db._explain(query, {}, {<span class="hljs-attr">colors</span>: <span class="hljs-literal">false</span>});
Query string:
 FOR doc <span class="hljs-keyword">in</span> geoSort SORT DISTANCE(doc.latitude, doc.longitude, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>) LIMIT <span class="hljs-number">5</span> RETURN doc

Execution plan:
 Id   NodeType        Est.   Comment
  <span class="hljs-number">1</span>   SingletonNode      <span class="hljs-number">1</span>   * ROOT
  <span class="hljs-number">7</span>   IndexNode        <span class="hljs-number">703</span>     - FOR doc IN geoSort   <span class="hljs-comment">/* geo2 index scan */</span>
  <span class="hljs-number">5</span>   LimitNode          <span class="hljs-number">5</span>       - LIMIT <span class="hljs-number">0</span>, <span class="hljs-number">5</span>
  <span class="hljs-number">6</span>   ReturnNode         <span class="hljs-number">5</span>       - RETURN doc

Indexes used:
 By   Type   Collection   Unique   Sparse   Selectivity   Fields                        Ranges
  <span class="hljs-number">7</span>   geo2   geoSort      <span class="hljs-literal">false</span>    <span class="hljs-literal">true</span>             n/a   [ <span class="hljs-string">`latitude`</span>, <span class="hljs-string">`longitude`</span> ]   NEAR(doc, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>)

Optimization rules applied:
 Id   RuleName
  <span class="hljs-number">1</span>   geo-index-optimizer
  <span class="hljs-number">2</span>   remove-unnecessary-calculations<span class="hljs-number">-2</span>


arangosh&gt; db._query(query);
[ 
  { 
    <span class="hljs-string">"_key"</span> : <span class="hljs-string">"36203"</span>, 
    <span class="hljs-string">"_id"</span> : <span class="hljs-string">"geoSort/36203"</span>, 
    <span class="hljs-string">"_rev"</span> : <span class="hljs-string">"_WnWXFHK--N"</span>, 
    <span class="hljs-string">"name"</span> : <span class="hljs-string">"Name/0/0"</span>, 
    <span class="hljs-string">"latitude"</span> : <span class="hljs-number">0</span>, 
    <span class="hljs-string">"longitude"</span> : <span class="hljs-number">0</span> 
  }, 
  { 
    <span class="hljs-string">"_key"</span> : <span class="hljs-string">"36092"</span>, 
    <span class="hljs-string">"_id"</span> : <span class="hljs-string">"geoSort/36092"</span>, 
    <span class="hljs-string">"_rev"</span> : <span class="hljs-string">"_WnWXFG2--L"</span>, 
    <span class="hljs-string">"name"</span> : <span class="hljs-string">"Name/-10/0"</span>, 
    <span class="hljs-string">"latitude"</span> : <span class="hljs-number">-10</span>, 
    <span class="hljs-string">"longitude"</span> : <span class="hljs-number">0</span> 
  }, 
  { 
    <span class="hljs-string">"_key"</span> : <span class="hljs-string">"36314"</span>, 
    <span class="hljs-string">"_id"</span> : <span class="hljs-string">"geoSort/36314"</span>, 
    <span class="hljs-string">"_rev"</span> : <span class="hljs-string">"_WnWXFHe--H"</span>, 
    <span class="hljs-string">"name"</span> : <span class="hljs-string">"Name/10/0"</span>, 
    <span class="hljs-string">"latitude"</span> : <span class="hljs-number">10</span>, 
    <span class="hljs-string">"longitude"</span> : <span class="hljs-number">0</span> 
  }, 
  { 
    <span class="hljs-string">"_key"</span> : <span class="hljs-string">"36200"</span>, 
    <span class="hljs-string">"_id"</span> : <span class="hljs-string">"geoSort/36200"</span>, 
    <span class="hljs-string">"_rev"</span> : <span class="hljs-string">"_WnWXFHK--L"</span>, 
    <span class="hljs-string">"name"</span> : <span class="hljs-string">"Name/0/-10"</span>, 
    <span class="hljs-string">"latitude"</span> : <span class="hljs-number">0</span>, 
    <span class="hljs-string">"longitude"</span> : <span class="hljs-number">-10</span> 
  }, 
  { 
    <span class="hljs-string">"_key"</span> : <span class="hljs-string">"36206"</span>, 
    <span class="hljs-string">"_id"</span> : <span class="hljs-string">"geoSort/36206"</span>, 
    <span class="hljs-string">"_rev"</span> : <span class="hljs-string">"_WnWXFHO---"</span>, 
    <span class="hljs-string">"name"</span> : <span class="hljs-string">"Name/0/10"</span>, 
    <span class="hljs-string">"latitude"</span> : <span class="hljs-number">0</span>, 
    <span class="hljs-string">"longitude"</span> : <span class="hljs-number">10</span> 
  } 
]
[object ArangoQueryCursor, <span class="hljs-attr">count</span>: <span class="hljs-number">5</span>, <span class="hljs-attr">cached</span>: <span class="hljs-literal">false</span>, <span class="hljs-attr">hasMore</span>: <span class="hljs-literal">false</span>]