When estimating the number of rows visited by a range scan for which the keys consist...

FossilOrigin-Name: 3e0590dee0e68cc1599858757c650a7378026170

diff --cc manifest
index 90bbcb29fd0f87d7eca911823b87802cefaccab1,3b2c011b8eaa2819d18ab4292e9f50e5be7a4400..e7e9fb89d89001dea1cac1d1a46e9e5cf812bd39
--- 1/manifest
--- 2/manifest
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- D 2015-03-16T13:48:23.259
 -C Another\stest\scase\sfor\sthe\splanner\schange\son\sthis\sbranch.
 -D 2015-03-16T09:21:30.738
++C When\sestimating\sthe\snumber\sof\srows\svisited\sby\sa\srange\sscan\sfor\swhich\sthe\skeys\sconsist\sof\smore\sthan\sone\sfield,\sconsider\sprefixes\sof\sstat4\ssamples\sas\swell\sas\sthe\sfull\ssamples.\sThis\sgenerates\smore\saccurate\sestimates.
++D 2015-03-16T16:28:43.573
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diff --cc manifest.uuid
index f8a6086b6f4b491e0a24436f2a1d3bdcc8065565,e21139d81b807587b97a3760c3ff525a35f91b40..7834d3d08ae34a8643eb55a09c1f5a9d5c820820
--- 1/manifest.uuid
--- 2/manifest.uuid
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