>> I am expecting two usable entries in sqlite3_index_info with
>> aConstraint[i].iColumn = 0 and aConstraint[i].op ==
>> SQLITE_INDEX_CONSTRAINT_EQ for each check
>
> What actually happens is that SQLite transforms the query into
>
> SELECT stamp, to_text(value) FROM store WHERE id IN (42,24).
>
> The xBestIndex method does not distinguish between == and IN, so only
> a single == constraint will be mentioned in the xBestIndex call.
>
How to i extract multiple values in xFilter -- int argc, sqlite3_value **argv ?
If i specify aConstraintUsage[].argvIndex = 1 then i should expect a list of
values (42 and 24) in argv[0].
>>
>> xBestIndex is called twice,
>>
>> a) once with only one non-usable entry with aConstraint[i].iColumn = 0
>> and aConstraint[i].op == SQLITE_INDEX_CONSTRAINT_EQ and
>
> Here it is checking the cost of a full table scan.
>
>> b) once with only one usable entry with aConstraint[i].iColumn = 0 and
>> aConstraint[i].op == SQLITE_INDEX_CONSTRAINT_EQ.
>
> Here it is checking the codes of using the IN operator. What
> estimatedCost values are you returning for these two calls. Because
> when I run it, and the cost of the second version is less, it chooses
> the second version. What version of SQLite are you using?
Sqlite Version = 3.8.7.1
Estimated cost and row for each call to xBestIndex (sqlite3_index_info is
filled with the below values for each call)
a) When there is one non-usable constraint
idxNum = 0 estimatedCost = 1000.000000 estimatedRows = 1000
b) when there is one usable constraint
idxNum = 1 estimatedCost = 1.000000 estimatedRows = 1
xFilter is called with idxNum = 0 and argc = 0
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