Re: [PATCH] Add extra statistics to explain for Nested Loop

Pavel Stehule <pavel.stehule@gmail.com>

From: Pavel Stehule <pavel.stehule@gmail.com>
To: e.sokolova@postgrespro.ru
Cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2020-10-16T08:11:48Z
Lists: pgsql-hackers
pá 16. 10. 2020 v 9:43 odesílatel <e.sokolova@postgrespro.ru> napsal:

> Hi, hackers.
> For some distributions of data in tables, different loops in nested loop
> joins can take different time and process different amounts of entries.
> It makes average statistics returned by explain analyze not very useful
> for DBA.
> To fix it, here is the patch that add printing of min and max statistics
> for time and rows across all loops in Nested Loop to EXPLAIN ANALYSE.
> Please don't hesitate to share any thoughts on this topic!
>

+1

This is great feature - sometimes it can be pretty messy current limited
format

Pavel

-- 
> Ekaterina Sokolova
> Postgres Professional: http://www.postgrespro.com
> The Russian Postgres Company

Commits

  1. Fix wrong units in two ExplainPropertyFloat calls.