pulls the rowid from the deferred seek target and does not actually move
the cursor or do a seek. Other where.c cleanups. (CVS 6536)
FossilOrigin-Name: 1c508a99822caa383e7e24b5d09a9bddd2ee3a00
addition to its legacy capabilities. Use Rowset to replace Rowhash.
In addition to requiring less code, This removes the 2^32 result row
limitation, uses less memory, and gives better bounds on worst-case
performance. The Rowhash implementation has yet to be removed. (CVS 6534)
FossilOrigin-Name: b101cf70b75c9772aaf50e0eadd0cfa37c84d193
