{% set description = description or _('ClickHouse is a fast open-source column-oriented database management system that allows generating analytical data reports in real-time using SQL queries') %}
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width,initial-scale=1" />

<title>{% if title %}{{ title }}{% else %}{{ _('ClickHouse - fast open-source OLAP DBMS') }}{% endif %}</title>

<link rel="shortcut icon" href="/favicon.ico" />
<link rel="apple-touch-icon" sizes="180x180" href="/images/logo-180x180.png" />

<meta property="og:title" content="{% if title %}{{ title }}{% else %}{{ _('ClickHouse DBMS') }}{% endif %}"/>
<meta property="og:description" content="{{ description }}" />
<meta property="og:type" content="{{ og_type or 'website' }}" />
{% if page and page.meta.image %}
<meta property="og:image" content="{{ page.meta.image}}" />
{% else %}
<meta property="og:image" content="https://clickhouse.tech/images/logo.png" />
{% endif %}
<meta property="og:url" content="{{ url or 'https://clickhouse.tech/' }}"/>
<link rel="canonical" href="{{ canonical_url or 'https://clickhouse.tech/' }}" />
{% if page and not single_page and not is_blog %}
<link rel="amphtml" href="{{ url or 'https://clickhouse.tech/' }}amp/" />
{% endif %}
<link rel="search" href="/opensearch.xml" title="ClickHouse" type="application/opensearchdescription+xml" />
{% include "templates/docs/ld_json.html" %}

<meta name="description" content="{{ description }}" />
{% if page and page.meta.tags %}
<meta name="keywords"
      content="{% for tag in page.meta.tags %}{{tag}}{{ ', ' if not loop.last }}{% endfor %}" />
{% else %}
<meta name="keywords"
      content="ClickHouse, DBMS, OLAP, SQL, {{ _('open-source') }}, {{ _('relational') }}, {{ _('analytics') }}, {{ _('analytical') }}, {{ _('Big Data') }}, {{ _('web-analytics') }}" />
{% endif %}
{% if config and config.extra.single_page %}
<meta name="robots" content="noindex,follow" />
{% endif %}

{% if config and page and not is_blog %}
    {% for code, name in config.extra.languages.items() %}
    <link rel="alternate" hreflang="{{ code }}" href="{{ config.extra.website_url }}/docs/{{ code }}/{{ page.url }}" />
    {% endfor %}
    <link rel="alternate" hreflang="x-default" href="{{ config.extra.website_url }}/docs/en/{{ page.url }}" />
{% endif %}

{% for prefetch_item in prefetch_items %}
<link rel="prefetch" href="{{ prefetch_item.0 }}" as="{{ prefetch_item.1 }}" />
{% endfor %}

{% if is_blog %}
<link rel="alternate" type="application/rss+xml" href="{{ config.site_url }}rss.xml" />
{% endif %}