Re: No support for UNION (OUTER JOIN instead)

Support for QuerySet.union(), intersection(), and difference() is added in Django 1.11.

https://github.com/django/django/commit/84c1826ded17b2d74f66717fb745fc36e37949fd

On Monday, March 13, 2017 at 11:54:15 AM UTC-4, guettli wrote:

We have performance issues on postgres because some SQL statements have up to six LEFT OUTER joins.

Union and intersection would be easier to read for me (human being) and maybe better to optimize for the postgres query planer.

It seems that other people have this issue, too: https://code.djangoproject.com/ticket/27260

The above ticket was closed with a comment to ask for help on the support channels. That's why I wrote here.

Have other developers seen performance issues because the SQL had a lot of LEFT OUTER joins?

Is there a work-around?

Regards,
  Thomas Güttelr

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