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When SORT is called with the option BY set to a string constant not inclduing the wildcard character "*", there is no way to sort the output so any ordering is valid. This allows the SORT internals to optimize its work and don't really sort the output at all. However it was odd that this option was not able to retain the natural order of a sorted set. This feature was requested by users multiple times as sometimes to call SORT with GET against sorted sets as a way to mass-fetch objects can be handy. This commit introduces two things: 1) The ability of SORT to return sorted sets elements in their natural ordering when `BY nosort` is specified, accordingly to `DESC / ASC` options. 2) The ability of SORT to optimize this case further if LIMIT is passed as well, avoiding to really fetch the whole sorted set, but directly obtaining the specified range. Because in this case the sorting is always deterministic, no post-sorting activity is performed when SORT is called from a Lua script. This commit fixes issue #98. |
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