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3 Commits

Author SHA1 Message Date
drh
172806e489 Fix the skip-ahead-distinct optimization so that it works with indexes that 
have repeated columns with different collating sequences.

FossilOrigin-Name: ce1e2b88777e00a82c04abe5ba35eec81b5f324e462f099cd00b21054f369688
 2017-04-13 21:29:02 +00:00
dan
a74f5c2923 New test cases and minor fixes for the optimization on this branch. 
FossilOrigin-Name: 70ac9ea1a6cb2f4906f00f1a04f668e5ba5eeed8d4d0fa4be57a9c9eb0683697
 2017-04-13 18:33:33 +00:00
drh
8489bf5aff Forward port the skip-ahead-distinct branch which was abandoned for some reason 
that I do not recall.  This port should have been achived by a merge of trunk
into the previous head of skip-ahead-distinct, but that did not work.  So I had
to manually "rebase" the changes.

FossilOrigin-Name: 132339a1fb0b9664df4d3eefbed6e77ef100ba95a91dcc622da7bd3fcdfcd6af
 2017-04-13 01:19:30 +00:00