issues: 830567275
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| id | node_id | number | title | user | state | locked | assignee | milestone | comments | created_at | updated_at | closed_at | author_association | pull_request | body | repo | type | active_lock_reason | performed_via_github_app | reactions | draft | state_reason |
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| 830567275 | MDU6SXNzdWU4MzA1NjcyNzU= | 1259 | Research using CTEs for faster facet counts | 9599 | open | 0 | 5 | 2021-03-12T22:19:49Z | 2021-03-21T22:55:31Z | OWNER | https://www.sqlite.org/changes.html#version_3_35_0 > Add support for the [MATERIALIZED](https://www.sqlite.org/lang_with.html#mathint) and [NOT MATERIALIZED](https://www.sqlite.org/lang_with.html#mathint) hints when specifying [common table expressions](https://www.sqlite.org/lang_with.html). The default behavior was formerly NOT MATERIALIZED, but is now changed to MATERIALIZED for CTEs that are used more than once. If a CTE creates a table that is used multiple time in that query, SQLite will now default to creating a materialized table for the duration of that query. This could be a big performance boost when applying faceting multiple times against the same query. Consider this example query: ```sql WITH data as ( select * from [global-power-plants] ), country_long as (select 'country_long' as col, country_long as value, count(*) as c from data group by country_long order by c desc limit 10 ), primary_fuel as ( select 'primary_fuel' as col, primary_fuel as value, count(*) as c from data group by primary_fuel order by c desc limit 10 ) select * from primary_fuel union select * from country_long order by col, c desc ``` https://global-power-plants.datasettes.com/global-power-plants?sql=WITH+data+as+%28%0D%0A++select%0D%0A++++*%0D%0A++from%0D%0A++++%5Bglobal-power-plants%5D%0D%0A%29%2C%0D%0Acountry_long+as+%28select+%0D%0A++%27country_long%27+as+col%2C+country_long+as+value%2C+count%28*%29+as+c+from+data+group+by+country_long%0D%0A++order+by+c+desc+limit+10%0D%0A%29%2C%0D%0Aprimary_fuel+as+%28%0D%0Aselect%0D%0A++%27primary_fuel%27+as+col%2C+primary_fuel+as+value%2C+count%28*%29+as+c+from+data+group+by+primary_fuel%0D%0A++order+by+c+desc+limit+10%0D%0A%29%0D%0Aselect+*+from+primary_fuel+union+select+*+from+country_long+order+by+col%2C+c+desc Outputs: col | value | c -- | -- | -- country_long | United States of America | 8688 country_long | China | 4235 country_long | United Kingdom | 2603 country_long | Brazil | 2360 country_long | France | 2155 country_long | India | 1590 country_long | Germany | 1309 country_long | Canada | 1159 country_long | Spain | 829 country_long | Russia | 545 primary_fuel | Solar | 9662 primary_fuel | Hydro | 7155 primary_fuel | Wind | 5188 primary_fuel | Gas | 3922 primary_fuel | Coal | 2390 primary_fuel | Oil | 2290 primary_fuel | Biomass | 1396 primary_fuel | Waste | 1087 primary_fuel | Nuclear | 198 primary_fuel | Geothermal | 189 | 107914493 | issue | {"url": "https://api.github.com/repos/simonw/datasette/issues/1259/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} |