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Better estimatedCost in the xBestIndex method of the generate_series vtab. 

FossilOrigin-Name: f2c16094a536e7ef62444d0fe38cbee2a4999426
This commit is contained in:
drh 2016-03-01 02:11:50 +00:00
parent 4e9d0d5418
commit 889cb33b8f
3 changed files with 9 additions and 9 deletions
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2
ext/misc/series.c
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@ -337,7 +337,7 @@ static int seriesBestIndex(
if( (idxNum & 3)==3 ){
/* Both start= and stop= boundaries are available. This is the
** the preferred case */
pIdxInfo->estimatedCost = (double)1;
pIdxInfo->estimatedCost = (double)(2 - ((idxNum&4)!=0));
pIdxInfo->estimatedRows = 1000;
if( pIdxInfo->nOrderBy==1 ){
if( pIdxInfo->aOrderBy[0].desc ) idxNum |= 8;

14
manifest
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@ -1,5 +1,5 @@
C Fix\sa\sproblem\sin\sfts5\swhere\sa\scorrupt\sdb\scould\slead\sto\sa\s(huge)\sbuffer\soverread.
D 2016-02-29T17:34:16.069
C Better\sestimatedCost\sin\sthe\sxBestIndex\smethod\sof\sthe\sgenerate_series\svtab.
D 2016-03-01T02:11:50.810
F Makefile.in 4e90dc1521879022aa9479268a4cd141d1771142
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc 4f319afb7c049d40aff7af6e8c4e7cc2ba18e079
@ -212,7 +212,7 @@ F ext/misc/nextchar.c 35c8b8baacb96d92abbb34a83a997b797075b342
F ext/misc/percentile.c bcbee3c061b884eccb80e21651daaae8e1e43c63
F ext/misc/regexp.c af92cdaa5058fcec1451e49becc7ba44dba023dc
F ext/misc/rot13.c 1ac6f95f99b575907b9b09c81a349114cf9be45a
F ext/misc/series.c b8fb7befd85b3a9b4a10e701b30b2b79ca92b6d4
F ext/misc/series.c 235d6281397003ad5226582de216507642aa0095
F ext/misc/showauth.c 732578f0fe4ce42d577e1c86dc89dd14a006ab52
F ext/misc/spellfix.c 525190484b7a9dbc6be646c4842274fff4f27d53
F ext/misc/totype.c 4a167594e791abeed95e0a8db028822b5e8fe512
@ -1451,7 +1451,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P 251d6473f7c9ad95adbdcc49cb8eaf7c0956764b
R 1a43d3061a1f154a38fc05ffa17e1f4a
U dan
Z 0ef60cd2035dd9bea82e9df13f5bcf57
P c9a30e117f2c6c9ef0cc0c6ca5227d2961715b8f
R 78072d3e9e5d5130b27dfb7458df9d26
U drh
Z 00eb8a065721ce5867f81f8e93fd77c0

2
manifest.uuid
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@ -1 +1 @@
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