Changes between Version 2 and Version 3 of Ticket #33973, comment 1


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Timestamp:
Sep 1, 2022, 11:14:12 AM (21 months ago)
Author:
Marc Parizeau

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  • Ticket #33973, comment 1

    v2 v3  
    11After more digging, it appears that the two worst culprits in my query are the 1st and 3rd `Exists`. The 1st is about 10x slower on 3.2.15 than on 3.1.14. The 3rd is about 6x slower on 3.2.15 than on 3.1.14. The execution times for the 2nd and 4th `Exists` are about the same for 3.2 and 3.1.
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    3 If I use only the 1st `Exists` in my query, by commenting out the 3 others, and by adding a False for the `Greatest` requirement of min 2 args, I obtain de following **explanations** (I also removed the `order_by` and `select_related` clauses to simplify the query as much as possible):
     3If I use only the 1st `Exists` in my query, by commenting out the 3 others, and by adding a False for the `Greatest` requirement of min 2 args, I obtain the following **explanations** (I also removed the `order_by` and `select_related` clauses to simplify the query as much as possible):
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    55**On Django 3.1.14**:
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