Hi,
I have a virtual table.
create table store (id int, stamp int, value blob);
When i execute the following sql
select stamp, to_text(value) from store where id = 42;
I get as expected sqlite3_index_info to have one usable entry with
aConstraint[i].iColumn = 0
aConstraint[i].op == SQLITE_INDEX_CONSTRAINT_EQ
In xBestIndex I set the aConstraintUsage[i].argvIndex value to 1, to indicate
that '42' should be the first argument in corresponding xFilter call.
And in the corresponding xFilter I get a value of 42 as the first argument and
I can initialize the cursor with just one element with id = 42.
When i execute the following sql
select stamp, to_text(value) from store where id = 42 or id = 24;
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
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
b) once with only one usable entry with aConstraint[i].iColumn = 0 and
aConstraint[i].op == SQLITE_INDEX_CONSTRAINT_EQ.
And the xFilter called corresponds to the first call to xBestIndex. Thus it
does a table scan to find entries (42, 24)
Am i missing something here ?
-venkat murty
Fiberlink Disclaimer: The information transmitted is intended only for the
person or entity to which it is addressed and may contain confidential and/or
privileged material. Any review, retransmission, dissemination or other use
of, or taking of any action in reliance upon, this information by persons or
entities other than the intended recipient is prohibited. If you received this
in error, please contact the sender and delete the material from any computer.
_______________________________________________
sqlite-users mailing list
[email protected]
http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
