On 14 Feb 2018, at 7:50am, Dominique Devienne <ddevie...@gmail.com> wrote:

> Thanks. That's interesting. But then, why use it in this context?
> Why DRH wants to purposely bypass the index in this case?
> How is that relevant to testing tuple / row-values comparisons? --DD

In the original example, column a is the PRIMARY KEY.  SQLite automatically 
makes an index for the PRIMARY KEY.  So SQLIte might use that index if there's 
a WHERE clause on a.  In the case of the ticket DRH wants to avoid this, since 
the bug shows up only when an index is not used.

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