html_url,issue_url,id,node_id,user,user_label,created_at,updated_at,author_association,body,reactions,issue,issue_label,performed_via_github_app
https://github.com/simonw/sqlite-utils/issues/215#issuecomment-753668099,https://api.github.com/repos/simonw/sqlite-utils/issues/215,753668099,MDEyOklzc3VlQ29tbWVudDc1MzY2ODA5OQ==,9599,simonw,2021-01-03T19:55:53Z,2021-01-03T19:55:53Z,OWNER,So if you instantiate the `Database()` constructor with `use_counts_table=True` any access to the `.count` properties will go through this table - otherwise regular `count(*)` queries will be executed.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",777535402,Use _counts to speed up counts,
https://github.com/simonw/sqlite-utils/issues/215#issuecomment-753665521,https://api.github.com/repos/simonw/sqlite-utils/issues/215,753665521,MDEyOklzc3VlQ29tbWVudDc1MzY2NTUyMQ==,9599,simonw,2021-01-03T19:31:33Z,2021-01-03T19:31:33Z,OWNER,"I'm having second thoughts about this being the default behaviour. It's pretty weird. I feel like HUGE databases that need this are rare, so having it on by default doesn't make sense.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",777535402,Use _counts to speed up counts,
https://github.com/simonw/sqlite-utils/issues/215#issuecomment-753662490,https://api.github.com/repos/simonw/sqlite-utils/issues/215,753662490,MDEyOklzc3VlQ29tbWVudDc1MzY2MjQ5MA==,9599,simonw,2021-01-03T19:05:53Z,2021-01-03T19:05:53Z,OWNER,Idea: a `.execute_count()` method that never uses the cache.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",777535402,Use _counts to speed up counts,
https://github.com/simonw/sqlite-utils/issues/215#issuecomment-753661292,https://api.github.com/repos/simonw/sqlite-utils/issues/215,753661292,MDEyOklzc3VlQ29tbWVudDc1MzY2MTI5Mg==,9599,simonw,2021-01-03T18:56:06Z,2021-01-03T18:56:23Z,OWNER,"Another option: on creation of the `Database()` object, check to see if the `_counts` table exists and use that as the default for a `use_counts_table` property. Also flip that property to `True` if the user calls `.enable_counts()` at any time.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",777535402,Use _counts to speed up counts,
https://github.com/simonw/sqlite-utils/issues/215#issuecomment-753661158,https://api.github.com/repos/simonw/sqlite-utils/issues/215,753661158,MDEyOklzc3VlQ29tbWVudDc1MzY2MTE1OA==,9599,simonw,2021-01-03T18:55:16Z,2021-01-03T18:55:16Z,OWNER,"Alternative implementation: provided `db.should_trust_counts` is `True`, try running the query:
```sql
select count from _counts where [table] = ?
```
If the query fails to return a result OR throws an error because the table doesn't exist, run the `count(*)` query.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",777535402,Use _counts to speed up counts,
https://github.com/simonw/sqlite-utils/issues/215#issuecomment-753660814,https://api.github.com/repos/simonw/sqlite-utils/issues/215,753660814,MDEyOklzc3VlQ29tbWVudDc1MzY2MDgxNA==,9599,simonw,2021-01-03T18:53:05Z,2021-01-03T18:53:05Z,OWNER,"Here's the current `.count` property: https://github.com/simonw/sqlite-utils/blob/036ec6d32313487527c66dea613a3e7118b97459/sqlite_utils/db.py#L597-L609

It's implemented on `Queryable` which means it's available on both `Table` and `View` - the optimization doesn't make sense for views.

I'm a bit cautious about making that property so much more complex. In order to decide if it should try the `_counts` table first it needs to know:

- Should it be trusting the counts? I'm thinking a `.should_trust_counts` property on `Database` which defaults to `True` would be good - then advanced users can turn that off if they know the counts should not be trusted.
- Does the `_counts` table exist?
- Are the triggers defined?

Then it can do the query, and if the query fails it can fall back on the `count(*)`. That's quite a lot of extra activity though.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",777535402,Use _counts to speed up counts,
https://github.com/simonw/sqlite-utils/issues/215#issuecomment-753660379,https://api.github.com/repos/simonw/sqlite-utils/issues/215,753660379,MDEyOklzc3VlQ29tbWVudDc1MzY2MDM3OQ==,9599,simonw,2021-01-03T18:50:15Z,2021-01-03T18:50:15Z,OWNER,"```python
    def cached_counts(self, tables=None):
        sql = ""select [table], count from {}"".format(self._counts_table_name)
        if tables:
            sql += "" where [table] in ({})"".format("", "".join(""?"" for table in tables))
        return {r[0]: r[1] for r in self.execute(sql, tables).fetchall()}
```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",777535402,Use _counts to speed up counts,
https://github.com/simonw/sqlite-utils/issues/215#issuecomment-753545757,https://api.github.com/repos/simonw/sqlite-utils/issues/215,753545757,MDEyOklzc3VlQ29tbWVudDc1MzU0NTc1Nw==,9599,simonw,2021-01-02T23:58:07Z,2021-01-02T23:58:07Z,OWNER,"Thought: maybe there should be a `.reset_counts()` method too, for if the table gets out of date with the triggers.

One way that could happen is if a table is dropped and recreated - the counts in the `_counts` table would likely no longer match the number of rows in that table.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",777535402,Use _counts to speed up counts,
https://github.com/simonw/sqlite-utils/issues/215#issuecomment-753545381,https://api.github.com/repos/simonw/sqlite-utils/issues/215,753545381,MDEyOklzc3VlQ29tbWVudDc1MzU0NTM4MQ==,9599,simonw,2021-01-02T23:52:52Z,2021-01-02T23:52:52Z,OWNER,Idea: a `db.cached_counts()` method that returns a dictionary of data from the `_counts` table. Call it with a list of tables to get back the counts for just those tables.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",777535402,Use _counts to speed up counts,