This commit fixes the performance issue in getting statistics for
``activity_state`` (colored clock icon for overdue/today/planned) in
CRM. The query has been tested for several years on a large database
(Odoo's own production database).
Performance test on 29 K crm.lead records (activity_state):
With a filter for 10 records:
```
| measurement | before | after |
|--------------------+--------+-------|
| number of queries | 25 | 5 |
| query time, ms | 12 | 95 | (*)
| remaining time, ms | 32 | 7 |
```
All records:
```
| measurement | before | after |
|--------------------+--------+-------|
| number of queries | 1326 | 5 |
| query time, ms | 1739 | 129 |
| remaining time, ms | 47934 | 17 |
```
As we can see in the last results, the time went from almost 50 seconds
(not responsive at all) to 150 milliseconds (responsive). The time
increase in (*) may be caused by imperfect measurements, which are raw
and not averaged measures.
---
opw-2346901
task-1915411
X-original-commit: 1088e73c9a897902f9d2d70df980fe2a5ed23492
Co-authored-by: Nicolas Seinlet <nse@odoo.com>
