417/sql/explain-analyze.html


<!DOCTYPE html>

<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.18.1: http://docutils.sourceforge.net/" />

  <meta name="viewport" content="width=device-width,initial-scale=1">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <meta name="lang:clipboard.copy" content="Copy to clipboard">
  <meta name="lang:clipboard.copied" content="Copied to clipboard">
  <meta name="lang:search.language" content="en">
  <meta name="lang:search.pipeline.stopwords" content="True">
  <meta name="lang:search.pipeline.trimmer" content="True">
  <meta name="lang:search.result.none" content="No matching documents">
  <meta name="lang:search.result.one" content="1 matching document">
  <meta name="lang:search.result.other" content="# matching documents">
  <meta name="lang:search.tokenizer" content="[\s\-]+">

  
    <link href="https://fonts.gstatic.com/" rel="preconnect" crossorigin>
    <link href="https://fonts.googleapis.com/css?family=Roboto+Mono:400,500,700|Roboto:300,400,400i,700&display=fallback" rel="stylesheet">

    <link href="https://fonts.googleapis.com/css2?family=Alata&family=Open+Sans:ital,wght%400,300;0,400;0,600;1,400&display=swap" rel="stylesheet">
    <style>
      body,
      input {
        font-family: "Roboto", "Helvetica Neue", Helvetica, Arial, sans-serif
      }

      code,
      kbd,
      pre {
        font-family: "Roboto Mono", "Courier New", Courier, monospace
      }
    </style>
  

  <link rel="stylesheet" href="../_static/stylesheets/application.css"/>
  <link rel="stylesheet" href="../_static/stylesheets/application-palette.css"/>
  <link rel="stylesheet" href="../_static/stylesheets/application-fixes.css"/>
  
  <link rel="stylesheet" href="../_static/fonts/material-icons.css"/>
  
  <meta name="theme-color" content="2196f3">
  <script src="../_static/javascripts/modernizr.js"></script>
  
  
    <title>EXPLAIN ANALYZE &#8212; Trino 417 Documentation</title>
    <link rel="stylesheet" type="text/css" href="../_static/pygments.css" />
    <link rel="stylesheet" type="text/css" href="../_static/material.css" />
    <link rel="stylesheet" type="text/css" href="../_static/copybutton.css" />
    <link rel="stylesheet" type="text/css" href="../_static/trino.css" />
    <script data-url_root="../" id="documentation_options" src="../_static/documentation_options.js"></script>
    <script src="../_static/jquery.js"></script>
    <script src="../_static/underscore.js"></script>
    <script src="../_static/_sphinx_javascript_frameworks_compat.js"></script>
    <script src="../_static/doctools.js"></script>
    <script src="../_static/clipboard.min.js"></script>
    <script src="../_static/copybutton.js"></script>
    <link rel="index" title="Index" href="../genindex.html" />
    <link rel="search" title="Search" href="../search.html" />
    <link rel="next" title="GRANT" href="grant.html" />
    <link rel="prev" title="EXPLAIN" href="explain.html" />
  
   
    <script async src="https://www.googletagmanager.com/gtag/js?id=UA-133457846-1"></script>
    <script>
      window.dataLayer = window.dataLayer || [];
      function gtag(){dataLayer.push(arguments);}
      gtag('js', new Date());
      gtag('config', 'UA-133457846-1');
      gtag('config', 'AW-1036784065');
      window._linkedin_data_partner_ids = ['2842796'];
    </script>
    <script async src="https://snap.licdn.com/li.lms-analytics/insight.min.js"></script>
    <link rel=stylesheet href=https://use.fontawesome.com/releases/v5.8.2/css/all.css>
  </head>
  <body dir=ltr
        data-md-color-primary= data-md-color-accent=>
  
  <svg class="md-svg">
    <defs data-children-count="0">
      
      <svg xmlns="http://www.w3.org/2000/svg" width="416" height="448" viewBox="0 0 416 448" id="__github"><path fill="currentColor" d="M160 304q0 10-3.125 20.5t-10.75 19T128 352t-18.125-8.5-10.75-19T96 304t3.125-20.5 10.75-19T128 256t18.125 8.5 10.75 19T160 304zm160 0q0 10-3.125 20.5t-10.75 19T288 352t-18.125-8.5-10.75-19T256 304t3.125-20.5 10.75-19T288 256t18.125 8.5 10.75 19T320 304zm40 0q0-30-17.25-51T296 232q-10.25 0-48.75 5.25Q229.5 240 208 240t-39.25-2.75Q130.75 232 120 232q-29.5 0-46.75 21T56 304q0 22 8 38.375t20.25 25.75 30.5 15 35 7.375 37.25 1.75h42q20.5 0 37.25-1.75t35-7.375 30.5-15 20.25-25.75T360 304zm56-44q0 51.75-15.25 82.75-9.5 19.25-26.375 33.25t-35.25 21.5-42.5 11.875-42.875 5.5T212 416q-19.5 0-35.5-.75t-36.875-3.125-38.125-7.5-34.25-12.875T37 371.5t-21.5-28.75Q0 312 0 260q0-59.25 34-99-6.75-20.5-6.75-42.5 0-29 12.75-54.5 27 0 47.5 9.875t47.25 30.875Q171.5 96 212 96q37 0 70 8 26.25-20.5 46.75-30.25T376 64q12.75 25.5 12.75 54.5 0 21.75-6.75 42 34 40 34 99.5z"/></svg>
      
    </defs>
  </svg>
  
  <input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer">
  <input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search">
  <label class="md-overlay" data-md-component="overlay" for="__drawer"></label>
  <a href="#sql/explain-analyze" tabindex="1" class="md-skip"> Skip to content </a>
  <div id="announcement">
  <div id="announcement-content">
    <a href="https://github.com/trinodb/trino" target="_blank">
      Do you ❤️ Trino? Give us a 🌟 on GitHub <i class="fab fa-github"></i>
    </a>
  </div>
</div>
<header class="md-header" data-md-component="header">
  <nav class="md-header-nav md-grid">
    <div class="md-flex navheader">
      <div class="md-flex__cell md-flex__cell--shrink">
        <a href="/" title="Trino"
           class="md-header-nav__button md-logo">
          
              <img src="../_static/trino.svg" height="26"
                   alt="Trino 417 Documentation logo">
          
        </a>
      </div>
      <div class="md-flex__cell md-flex__cell--shrink">
        <label class="md-icon md-icon--menu md-header-nav__button" for="__drawer"></label>
      </div>
      <div class="md-flex__cell md-flex__cell--stretch">
        <div class="md-flex__ellipsis md-header-nav__title" data-md-component="title">
          <span class="md-header-nav__topic">Trino 417 Documentation</span>
          <span class="md-header-nav__topic"> EXPLAIN ANALYZE </span>
        </div>
      </div>
      <div class="md-flex__cell md-flex__cell--shrink">
        <label class="md-icon md-icon--search md-header-nav__button" for="__search"></label>
        
<div class="md-search" data-md-component="search" role="dialog">
  <label class="md-search__overlay" for="__search"></label>
  <div class="md-search__inner" role="search">
    <form class="md-search__form" action="../search.html" method="GET" name="search">
      <input type="text" class="md-search__input" name="q" placeholder="Search"
             autocapitalize="off" autocomplete="off" spellcheck="false"
             data-md-component="query" data-md-state="active">
      <label class="md-icon md-search__icon" for="__search"></label>
      <button type="reset" class="md-icon md-search__icon" data-md-component="reset" tabindex="-1">
        &#xE5CD;
      </button>
    </form>
    <div class="md-search__output">
      <div class="md-search__scrollwrap" data-md-scrollfix>
        <div class="md-search-result" data-md-component="result">
          <div class="md-search-result__meta">
            Type to start searching
          </div>
          <ol class="md-search-result__list"></ol>
        </div>
      </div>
    </div>
  </div>
</div>

      </div>
      
        <div class="md-flex__cell md-flex__cell--shrink">
          <div class="md-header-nav__source">
            <a href="https://github.com/trinodb/trino" title="Go to repository" class="md-source" data-md-source="github">

    <div class="md-source__icon">
      <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24" width="28" height="28">
        <use xlink:href="#__github" width="24" height="24"></use>
      </svg>
    </div>
  
  <div class="md-source__repository">
    Trino
  </div>
</a>
          </div>
        </div>
      
      
  <script src="../_static/javascripts/version_dropdown.js"></script>
  <script>
    var json_loc = "../../versions.json",
        target_loc = "../../",
        text = "Versions";
    $( document ).ready( add_version_dropdown(json_loc, target_loc, text));
  </script>
  

    </div>
  </nav>
</header>

  
  <div class="md-container">
    
    
    <!-- empty -->
    <main class="md-main">
      <div class="md-main__inner md-grid" data-md-component="container">
        
          <div class="md-sidebar md-sidebar--primary" data-md-component="navigation">
            <div class="md-sidebar__scrollwrap">
              <div class="md-sidebar__inner">
                <nav class="md-nav md-nav--primary" data-md-level="0">
  <label class="md-nav__title md-nav__title--site" for="__drawer">
    <a href="/" title="Trino" class="md-nav__button md-logo">
      
        <img src="../_static/trino.svg" alt=" logo" width="48" height="48">
      
    </a>
    <a href="../index.html"
       title="Trino 417 Documentation">Trino 417 Documentation</a>
  </label>
    <div class="md-nav__source">
      <a href="https://github.com/trinodb/trino" title="Go to repository" class="md-source" data-md-source="github">

    <div class="md-source__icon">
      <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 24 24" width="28" height="28">
        <use xlink:href="#__github" width="24" height="24"></use>
      </svg>
    </div>
  
  <div class="md-source__repository">
    Trino
  </div>
</a>
    </div>
  
  
  <ul class="md-nav__list">
    <li class="md-nav__item">
    
    
      <a href="../overview.html" class="md-nav__link">Overview</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../installation.html" class="md-nav__link">Installation</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../client.html" class="md-nav__link">Clients</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../security.html" class="md-nav__link">Security</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../admin.html" class="md-nav__link">Administration</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../admin.html#event-listeners" class="md-nav__link">Event listeners</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../optimizer.html" class="md-nav__link">Query optimizer</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../connector.html" class="md-nav__link">Connectors</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../functions.html" class="md-nav__link">Functions and operators</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../language.html" class="md-nav__link">SQL language</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../sql.html" class="md-nav__link">SQL statement syntax</a>
      <ul class="md-nav__list"> 
    <li class="md-nav__item">
    
    
      <a href="alter-materialized-view.html" class="md-nav__link">ALTER MATERIALIZED VIEW</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="alter-schema.html" class="md-nav__link">ALTER SCHEMA</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="alter-table.html" class="md-nav__link">ALTER TABLE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="alter-view.html" class="md-nav__link">ALTER VIEW</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="analyze.html" class="md-nav__link">ANALYZE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="call.html" class="md-nav__link">CALL</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="comment.html" class="md-nav__link">COMMENT</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="commit.html" class="md-nav__link">COMMIT</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="create-materialized-view.html" class="md-nav__link">CREATE MATERIALIZED VIEW</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="create-role.html" class="md-nav__link">CREATE ROLE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="create-schema.html" class="md-nav__link">CREATE SCHEMA</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="create-table.html" class="md-nav__link">CREATE TABLE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="create-table-as.html" class="md-nav__link">CREATE TABLE AS</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="create-view.html" class="md-nav__link">CREATE VIEW</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="deallocate-prepare.html" class="md-nav__link">DEALLOCATE PREPARE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="delete.html" class="md-nav__link">DELETE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="deny.html" class="md-nav__link">DENY</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="describe.html" class="md-nav__link">DESCRIBE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="describe-input.html" class="md-nav__link">DESCRIBE INPUT</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="describe-output.html" class="md-nav__link">DESCRIBE OUTPUT</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="drop-materialized-view.html" class="md-nav__link">DROP MATERIALIZED VIEW</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="drop-role.html" class="md-nav__link">DROP ROLE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="drop-schema.html" class="md-nav__link">DROP SCHEMA</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="drop-table.html" class="md-nav__link">DROP TABLE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="drop-view.html" class="md-nav__link">DROP VIEW</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="execute.html" class="md-nav__link">EXECUTE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="explain.html" class="md-nav__link">EXPLAIN</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
    <input class="md-toggle md-nav__toggle" data-md-toggle="toc" type="checkbox" id="__toc">
    <label class="md-nav__link md-nav__link--active" for="__toc"> EXPLAIN ANALYZE </label>
    
      <a href="#" class="md-nav__link md-nav__link--active">EXPLAIN ANALYZE</a>
      
        
<nav class="md-nav md-nav--secondary">
    <label class="md-nav__title" for="__toc">Contents</label>
    <ul class="md-nav__list" data-md-scrollfix="">
        <li class="md-nav__item"><a href="#synopsis" class="md-nav__link">Synopsis</a>
        </li>
        <li class="md-nav__item"><a href="#description" class="md-nav__link">Description</a>
        </li>
        <li class="md-nav__item"><a href="#examples" class="md-nav__link">Examples</a>
        </li>
        <li class="md-nav__item"><a href="#see-also" class="md-nav__link">See also</a>
        </li>
    </ul>
</nav>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="grant.html" class="md-nav__link">GRANT</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="grant-roles.html" class="md-nav__link">GRANT ROLES</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="insert.html" class="md-nav__link">INSERT</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="match-recognize.html" class="md-nav__link">MATCH_RECOGNIZE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="merge.html" class="md-nav__link">MERGE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="pattern-recognition-in-window.html" class="md-nav__link">Row pattern recognition in window structures</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="prepare.html" class="md-nav__link">PREPARE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="refresh-materialized-view.html" class="md-nav__link">REFRESH MATERIALIZED VIEW</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="reset-session.html" class="md-nav__link">RESET SESSION</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="revoke.html" class="md-nav__link">REVOKE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="revoke-roles.html" class="md-nav__link">REVOKE ROLES</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="rollback.html" class="md-nav__link">ROLLBACK</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="select.html" class="md-nav__link">SELECT</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="set-role.html" class="md-nav__link">SET ROLE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="set-session.html" class="md-nav__link">SET SESSION</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="set-time-zone.html" class="md-nav__link">SET TIME ZONE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-catalogs.html" class="md-nav__link">SHOW CATALOGS</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-columns.html" class="md-nav__link">SHOW COLUMNS</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-create-materialized-view.html" class="md-nav__link">SHOW CREATE MATERIALIZED VIEW</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-create-schema.html" class="md-nav__link">SHOW CREATE SCHEMA</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-create-table.html" class="md-nav__link">SHOW CREATE TABLE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-create-view.html" class="md-nav__link">SHOW CREATE VIEW</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-functions.html" class="md-nav__link">SHOW FUNCTIONS</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-grants.html" class="md-nav__link">SHOW GRANTS</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-role-grants.html" class="md-nav__link">SHOW ROLE GRANTS</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-roles.html" class="md-nav__link">SHOW ROLES</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-schemas.html" class="md-nav__link">SHOW SCHEMAS</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-session.html" class="md-nav__link">SHOW SESSION</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-stats.html" class="md-nav__link">SHOW STATS</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="show-tables.html" class="md-nav__link">SHOW TABLES</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="start-transaction.html" class="md-nav__link">START TRANSACTION</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="truncate.html" class="md-nav__link">TRUNCATE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="update.html" class="md-nav__link">UPDATE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="use.html" class="md-nav__link">USE</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="values.html" class="md-nav__link">VALUES</a>
      
    
    </li></ul>
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../develop.html" class="md-nav__link">Developer guide</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../glossary.html" class="md-nav__link">Glossary</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../appendix.html" class="md-nav__link">Appendix</a>
      
    
    </li>
    <li class="md-nav__item">
    
    
      <a href="../release.html" class="md-nav__link">Release notes</a>
      
    
    </li>
  </ul>
  

</nav>
              </div>
            </div>
          </div>
          <div class="md-sidebar md-sidebar--secondary" data-md-component="toc">
            <div class="md-sidebar__scrollwrap">
              <div class="md-sidebar__inner">
                
<nav class="md-nav md-nav--secondary">
    <label class="md-nav__title" for="__toc">Contents</label>
    <ul class="md-nav__list" data-md-scrollfix="">
        <li class="md-nav__item"><a href="#synopsis" class="md-nav__link">Synopsis</a>
        </li>
        <li class="md-nav__item"><a href="#description" class="md-nav__link">Description</a>
        </li>
        <li class="md-nav__item"><a href="#examples" class="md-nav__link">Examples</a>
        </li>
        <li class="md-nav__item"><a href="#see-also" class="md-nav__link">See also</a>
        </li>
    </ul>
</nav>
              </div>
            </div>
          </div>
        
        <div class="md-content">
          <article class="md-content__inner md-typeset" role="main">
            
  <section id="explain-analyze">
<h1 id="sql-explain-analyze--page-root">EXPLAIN ANALYZE<a class="headerlink" href="#sql-explain-analyze--page-root" title="Permalink to this heading">#</a></h1>
<section id="synopsis">
<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this heading">#</a></h2>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>EXPLAIN ANALYZE [VERBOSE] statement
</pre></div>
</div>
</section>
<section id="description">
<h2 id="description">Description<a class="headerlink" href="#description" title="Permalink to this heading">#</a></h2>
<p>Execute the statement and show the distributed execution plan of the statement
along with the cost of each operation.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">VERBOSE</span></code> option will give more detailed information and low-level statistics;
understanding these may require knowledge of Trino internals and implementation details.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The stats may not be entirely accurate, especially for queries that complete quickly.</p>
</div>
</section>
<section id="examples">
<h2 id="examples">Examples<a class="headerlink" href="#examples" title="Permalink to this heading">#</a></h2>
<p>In the example below, you can see the CPU time spent in each stage, as well as the relative
cost of each plan node in the stage. Note that the relative cost of the plan nodes is based on
wall time, which may or may not be correlated to CPU time. For each plan node you can see
some additional statistics (e.g: average input per node instance). Such statistics are useful
when one wants to detect data anomalies for a query (e.g: skewness).</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">EXPLAIN</span> <span class="k">ANALYZE</span> <span class="k">SELECT</span> <span class="k">count</span><span class="p">(</span><span class="o">*</span><span class="p">),</span> <span class="n">clerk</span> <span class="k">FROM</span> <span class="n">orders</span>
<span class="k">WHERE</span> <span class="n">orderdate</span> <span class="o">&gt;</span> <span class="nb">date</span> <span class="s1">'1995-01-01'</span> <span class="k">GROUP</span> <span class="k">BY</span> <span class="n">clerk</span><span class="p">;</span>
</pre></div>
</div>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>                                          Query Plan
-----------------------------------------------------------------------------------------------
Trino version: version
Queued: 374.17us, Analysis: 190.96ms, Planning: 179.03ms, Execution: 3.06s
Fragment 1 [HASH]
    CPU: 22.58ms, Scheduled: 96.72ms, Blocked 46.21s (Input: 23.06s, Output: 0.00ns), Input: 1000 rows (37.11kB); per task: avg.: 1000.00 std.dev.: 0.00, Output: 1000 rows (28.32kB)
    Output layout: [clerk, count]
    Output partitioning: SINGLE []
    Project[]
    │   Layout: [clerk:varchar(15), count:bigint]
    │   Estimates: {rows: ? (?), cpu: ?, memory: 0B, network: 0B}
    │   CPU: 8.00ms (3.51%), Scheduled: 63.00ms (15.11%), Blocked: 0.00ns (0.00%), Output: 1000 rows (28.32kB)
    │   Input avg.: 15.63 rows, Input std.dev.: 24.36%
    └─ Aggregate[type = FINAL, keys = [clerk], hash = [$hashvalue]]
       │   Layout: [clerk:varchar(15), $hashvalue:bigint, count:bigint]
       │   Estimates: {rows: ? (?), cpu: ?, memory: ?, network: 0B}
       │   CPU: 8.00ms (3.51%), Scheduled: 22.00ms (5.28%), Blocked: 0.00ns (0.00%), Output: 1000 rows (37.11kB)
       │   Input avg.: 15.63 rows, Input std.dev.: 24.36%
       │   count := count("count_0")
       └─ LocalExchange[partitioning = HASH, hashColumn = [$hashvalue], arguments = ["clerk"]]
          │   Layout: [clerk:varchar(15), count_0:bigint, $hashvalue:bigint]
          │   Estimates: {rows: ? (?), cpu: ?, memory: 0B, network: 0B}
          │   CPU: 2.00ms (0.88%), Scheduled: 4.00ms (0.96%), Blocked: 23.15s (50.10%), Output: 1000 rows (37.11kB)
          │   Input avg.: 15.63 rows, Input std.dev.: 793.73%
          └─ RemoteSource[sourceFragmentIds = [2]]
                 Layout: [clerk:varchar(15), count_0:bigint, $hashvalue_1:bigint]
                 CPU: 0.00ns (0.00%), Scheduled: 0.00ns (0.00%), Blocked: 23.06s (49.90%), Output: 1000 rows (37.11kB)
                 Input avg.: 15.63 rows, Input std.dev.: 793.73%

Fragment 2 [SOURCE]
    CPU: 210.60ms, Scheduled: 327.92ms, Blocked 0.00ns (Input: 0.00ns, Output: 0.00ns), Input: 1500000 rows (18.17MB); per task: avg.: 1500000.00 std.dev.: 0.00, Output: 1000 rows (37.11kB)
    Output layout: [clerk, count_0, $hashvalue_2]
    Output partitioning: HASH [clerk][$hashvalue_2]
    Aggregate[type = PARTIAL, keys = [clerk], hash = [$hashvalue_2]]
    │   Layout: [clerk:varchar(15), $hashvalue_2:bigint, count_0:bigint]
    │   CPU: 30.00ms (13.16%), Scheduled: 30.00ms (7.19%), Blocked: 0.00ns (0.00%), Output: 1000 rows (37.11kB)
    │   Input avg.: 818058.00 rows, Input std.dev.: 0.00%
    │   count_0 := count(*)
    └─ ScanFilterProject[table = hive:sf1:orders, filterPredicate = ("orderdate" &gt; DATE '1995-01-01')]
           Layout: [clerk:varchar(15), $hashvalue_2:bigint]
           Estimates: {rows: 1500000 (41.48MB), cpu: 35.76M, memory: 0B, network: 0B}/{rows: 816424 (22.58MB), cpu: 35.76M, memory: 0B, network: 0B}/{rows: 816424 (22.58MB), cpu: 22.58M, memory: 0B, network: 0B}
           CPU: 180.00ms (78.95%), Scheduled: 298.00ms (71.46%), Blocked: 0.00ns (0.00%), Output: 818058 rows (12.98MB)
           Input avg.: 1500000.00 rows, Input std.dev.: 0.00%
           $hashvalue_2 := combine_hash(bigint '0', COALESCE("$operator$hash_code"("clerk"), 0))
           clerk := clerk:varchar(15):REGULAR
           orderdate := orderdate:date:REGULAR
           Input: 1500000 rows (18.17MB), Filtered: 45.46%, Physical Input: 4.51MB
</pre></div>
</div>
<p>When the <code class="docutils literal notranslate"><span class="pre">VERBOSE</span></code> option is used, some operators may report additional information.
For example, the window function operator will output the following:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">EXPLAIN</span> <span class="k">ANALYZE</span> <span class="k">VERBOSE</span> <span class="k">SELECT</span> <span class="k">count</span><span class="p">(</span><span class="n">clerk</span><span class="p">)</span> <span class="n">OVER</span><span class="p">()</span> <span class="k">FROM</span> <span class="n">orders</span>
<span class="k">WHERE</span> <span class="n">orderdate</span> <span class="o">&gt;</span> <span class="nb">date</span> <span class="s1">'1995-01-01'</span><span class="p">;</span>
</pre></div>
</div>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>                                          Query Plan
-----------------------------------------------------------------------------------------------
  ...
         ─ Window[]
           │   Layout: [clerk:varchar(15), count:bigint]
           │   CPU: 157.00ms (53.40%), Scheduled: 158.00ms (37.71%), Blocked: 0.00ns (0.00%), Output: 818058 rows (22.62MB)
           │   metrics:
           │     'CPU time distribution (s)' = {count=1.00, p01=0.16, p05=0.16, p10=0.16, p25=0.16, p50=0.16, p75=0.16, p90=0.16, p95=0.16, p99=0.16, min=0.16, max=0.16}
           │     'Input rows distribution' = {count=1.00, p01=818058.00, p05=818058.00, p10=818058.00, p25=818058.00, p50=818058.00, p75=818058.00, p90=818058.00, p95=818058.00, p99=818058.00, min=818058.00, max=818058.00}
           │     'Scheduled time distribution (s)' = {count=1.00, p01=0.16, p05=0.16, p10=0.16, p25=0.16, p50=0.16, p75=0.16, p90=0.16, p95=0.16, p99=0.16, min=0.16, max=0.16}
           │   Input avg.: 818058.00 rows, Input std.dev.: 0.00%
           │   Active Drivers: [ 1 / 1 ]
           │   Index size: std.dev.: 0.00 bytes, 0.00 rows
           │   Index count per driver: std.dev.: 0.00
           │   Rows per driver: std.dev.: 0.00
           │   Size of partition: std.dev.: 0.00
           │   count := count("clerk") RANGE UNBOUNDED_PRECEDING CURRENT_ROW
 ...
</pre></div>
</div>
</section>
<section id="see-also">
<h2 id="see-also">See also<a class="headerlink" href="#see-also" title="Permalink to this heading">#</a></h2>
<p><a class="reference internal" href="explain.html"><span class="doc">EXPLAIN</span></a></p>
</section>
</section>


          </article>
        </div>
      </div>
    </main>
  </div>
  <footer class="md-footer">
    <div class="md-footer-nav">
      <nav class="md-footer-nav__inner md-grid">
          
            <a href="explain.html" title="EXPLAIN"
               class="md-flex md-footer-nav__link md-footer-nav__link--prev"
               rel="prev">
              <div class="md-flex__cell md-flex__cell--shrink">
                <i class="md-icon md-icon--arrow-back md-footer-nav__button"></i>
              </div>
              <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title">
                <span class="md-flex__ellipsis">
                  <span
                      class="md-footer-nav__direction"> Previous </span> EXPLAIN </span>
              </div>
            </a>
          
          
            <a href="grant.html" title="GRANT"
               class="md-flex md-footer-nav__link md-footer-nav__link--next"
               rel="next">
            <div class="md-flex__cell md-flex__cell--stretch md-footer-nav__title"><span
                class="md-flex__ellipsis"> <span
                class="md-footer-nav__direction"> Next </span> GRANT </span>
            </div>
            <div class="md-flex__cell md-flex__cell--shrink"><i
                class="md-icon md-icon--arrow-forward md-footer-nav__button"></i>
            </div>
          
        </a>
        
      </nav>
    </div>
    <div class="md-footer-meta md-typeset">
      <div class="md-footer-meta__inner md-grid">
        <div class="md-footer-copyright">
        </div>
      </div>
    </div>
  </footer>
  <script src="../_static/javascripts/application.js"></script>
  <script>app.initialize({version: "1.0.4", url: {base: ".."}})</script>
  </body>
</html>