Peter Serwylo aae0a57dfe Improve performance of suggested version calculation.
The history of this is that #974 identified a problem, which was fixed
in !497. That MR added test coverage for the bug.

However, the fix for it actually added a huge performance hit, on the
order of 30 seconds or so when calculating the suggested version.

This fixes that performance problem by removing the need for a sub
query. The end goal is to take the following query:

```
UPDATE app
SET suggestedVersion = (
  SELECT MAX(apk.version)
  FROM apk
  WHERE ...
)
```

and the `WHERE` clause needs to somehow join the outer `app` table with
the inner `apk` table, such that the repo in question does not matter.
It can't just join directly from `apk.appId -> app.rowid`, because the
`app` is specific to a given repository, but we want to select the
`MAX(apk.version)` from every related apk, regardless of repo.

This commit solves it by joining the inner `apk` table onto an
intermediate `app` table, which is used purely so that we can select
apks where their `packageId` is the same as the `packageId` of the app
being updated.
2017-06-12 13:47:41 +10:00
2017-06-06 16:12:23 +02:00
2017-05-01 23:46:13 +02:00
2015-09-25 22:00:24 -07:00
2016-03-29 17:45:11 +01:00
2017-05-01 23:46:13 +02:00
2017-05-31 19:38:06 +02:00
2016-09-28 22:15:00 +01:00
2015-08-24 10:35:55 -07:00
2017-04-19 10:48:13 +02:00

F-Droid Client

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Client for F-Droid, the Free Software repository system for Android.

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