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Prevent the WhereLoop.rSetup cost estimate from going negative on complex 

queries.

FossilOrigin-Name: f81050859170c8708a1b296da8dd3ef0dd314a11
This commit is contained in:
drh 2016-06-26 04:06:28 +00:00
parent 4b37cd49a6
commit 05d1bad674
3 changed files with 8 additions and 7 deletions
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@ -1,5 +1,5 @@
C Fix\sthe\shandling\sof\sOP_Eq\sopcodes\sthat\scompare\sa\sregister\sagainst\sitself\nand\sthat\srequire\san\saffinity\schange.
D 2016-06-25T11:43:47.381
C Prevent\sthe\sWhereLoop.rSetup\scost\sestimate\sfrom\sgoing\snegative\son\scomplex\nqueries.
D 2016-06-26T04:06:28.081
F Makefile.in bc2b4864a23a4a21c3e26d7b4350f51bab324d45
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc 50149765ef72f4e652b9a0f1f6462c4784bb9423
@ -462,7 +462,7 @@ F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
F src/wal.c 02eeecc265f6ffd0597378f5d8ae9070b62a406a
F src/wal.h 2f7c831cf3b071fa548bf2d5cac640846a7ff19c
F src/walker.c 0f142b5bd3ed2041fc52d773880748b212e63354
F src/where.c 0ce4793497af2feb051147a5cc6356f95d3ab381
F src/where.c 48eed8ebe319c6cbc7bf7682018f32af0f5189f5
F src/whereInt.h e5b939701a7ceffc5a3a8188a37f9746416ebcd0
F src/wherecode.c e20cb381ff621e56a4684c71e31999aca2547ca6
F src/whereexpr.c c32d47085dbaca0b8fd013210f56693c7d220d48
@ -1502,7 +1502,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
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R 3ef1ee60339b9a478f36c983b60b7e48
P 507014e4c7a70cd09410c89c8ed466c8edab39d2
R ae55d782914cbf2db58c75f82f862316
U drh
Z 7d552df043719cedc46422a9795a23bd
Z e21bca843071316b56d3c29d5bf9cc08

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507014e4c7a70cd09410c89c8ed466c8edab39d2
f81050859170c8708a1b296da8dd3ef0dd314a11

1
src/where.c
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@ -2701,6 +2701,7 @@ static int whereLoopAddBtree(
pNew->rSetup += 24;
}
ApplyCostMultiplier(pNew->rSetup, pTab->costMult);
if( pNew->rSetup<0 ) pNew->rSetup = 0;
/* TUNING: Each index lookup yields 20 rows in the table. This
** is more than the usual guess of 10 rows, since we have no way
** of knowing how selective the index will ultimately be. It would