ClickHouse/order_by_tuple.xml at 9a391f2fedea84afece8274b2291d14c587b7f84 - ClickHouse - gitea@var1able.network

thevar1able/ClickHouse

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Amos Bird faee95b897

Make ORDER BY tuple almost as fast as ORDER BY columns

We have special optimizations for multiple column ORDER BY: https://github.com/ClickHouse/ClickHouse/pull/10831 . It's beneficial to also apply to tuple columns.

Before:

select * from numbers(300000000) order by (1 - number , number + 1 , number) limit 10;
2.613 sec.

After:

select * from numbers(300000000) order by (1 - number , number + 1 , number) limit 10;
0.755 sec

No tuple:

select * from numbers(300000000) order by 1 - number , number + 1 , number limit 10;
0.755 sec

2022-01-27 21:42:08 +08:00

9 lines

202 B

XML

Raw Blame History

 <test>
     <tags>
         <tag>sorting</tag>
         <tag>comparison</tag>
     </tags>
     <query>select * from numbers(300000000) order by (1 - number , number + 1 , number) limit 10;</query>
 </test>