From: dan <dan@noemail.net>
Date: Mon, 16 Mar 2015 16:28:43 +0000 (+0000)
Subject: When estimating the number of rows visited by a range scan for which the keys consist... 
X-Git-Tag: version-3.8.9~75
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=5f881b8c8d3bd992e196919e10b6db4f1a47993f;p=thirdparty%2Fsqlite.git

When estimating the number of rows visited by a range scan for which the keys consist of more than one field, consider prefixes of stat4 samples as well as the full samples. This generates more accurate estimates.

FossilOrigin-Name: 3e0590dee0e68cc1599858757c650a7378026170
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5f881b8c8d3bd992e196919e10b6db4f1a47993f
diff --cc manifest
index 90bbcb29fd,3b2c011b8e..e7e9fb89d8
--- a/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Use\s#ifdef\sto\somit\scode\sthat\sis\sonly\sused\sfor\sSTAT3\sand\sSTAT4.
- 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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  F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@@ -1244,7 -1244,7 +1244,7 @@@ F tool/vdbe_profile.tcl 67746953071a9f8
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  F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
  F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
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++R 91b4618acc4046613febfb03ba644299
+ U dan
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diff --cc manifest.uuid
index f8a6086b6f,e21139d81b..7834d3d08a
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@@@ -1,1 -1,1 +1,1 @@@
- f2c9c5b57b7739daafc44e8ec36d4a2beacd5f17
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