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Parents and children of check-in [ed1b30dc93]

For queries with both ORDER BY and LIMIT, if the rows of the inner loop are emitted in ORDER BY order and the LIMIT has been reached, then optimize by exiting the inner loop and continuing with the next cycle of the first outer loop. (check-in: 559733b09e user: drh tags: trunk)
Set the NULLEQ flag on the sequence counter comparison in the ORDER BY LIMIT optimization, to avoid coverage complaints about not testing the NULL case. (Closed-Leaf check-in: ed1b30dc93 user: drh tags: orderby-limit)
A few simple test cases for the ORDER BY LIMIT optimization. (check-in: 08849eab0f user: drh tags: orderby-limit)