Hi,
> Running SYS(3054,11,"lcOpt") says this query is not optimizable, yet
there's an index on both start and stop fields:
That's because you combine an optimizable expression bit-wise OR with the
non-optimizable expression EMPTY(stop). Rushmore uses
non-opt OR opt = non-opt
since the non-optimizable expression would force VFP to read the entire
table anyway. To optimize this expression, use
stop = {}
instead.
--
Christof
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