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For the OP_SeekScan opcode, adjust the number of steps run before giving

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up based on the estimated number of comparisons needed to perform a seek.

FossilOrigin-Name: dc4172e6b8e1f62dc7329a3adb2223f290bc4c8055c265e88182ef432f4bcf10
This commit is contained in:
drh
2020-09-30 18:03:22 +00:00
parent a957e22fa4
commit 4f65b3bbfb
3 changed files with 17 additions and 8 deletions
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12
manifest
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@@ -1,5 +1,5 @@
C Add\san\ssqlite3FaultSim()\scall\sto\sbtreeNext()\sto\smake\sit\seasier\sto\nsimulate\sI/O\serrors\sin\scalls\sto\ssqlite3BtreeNext(),\sand\sin\sOP_SeekScan. C For\sthe\sOP_SeekScan\sopcode,\sadjust\sthe\snumber\sof\ssteps\srun\sbefore\sgiving\nup\sbased\son\sthe\sestimated\snumber\sof\scomparisons\sneeded\sto\sperform\sa\sseek.
D 2020-09-30T00:48:45.754 D 2020-09-30T18:03:22.696
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F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -624,7 +624,7 @@ F src/wal.h c3aa7825bfa2fe0d85bef2db94655f99870a285778baa36307c0a16da32b226a
F src/walker.c 3df26a33dc4f54e8771600fb7fdebe1ece0896c2ad68c30ab40b017aa4395049 F src/walker.c 3df26a33dc4f54e8771600fb7fdebe1ece0896c2ad68c30ab40b017aa4395049
F src/where.c da9c0d503f81cc8444eb3525b75eec2bb3d198f4d5939b207977f2fc20d85b54 F src/where.c da9c0d503f81cc8444eb3525b75eec2bb3d198f4d5939b207977f2fc20d85b54
F src/whereInt.h 59077fbd0b3d01bc8715e746c86a99ebf4c85bde8a57077ec04d2a23e59666ec F src/whereInt.h 59077fbd0b3d01bc8715e746c86a99ebf4c85bde8a57077ec04d2a23e59666ec
F src/wherecode.c 8d5e5973bcb5348877ac07ec85fb98cc3bb3b3377b79845cb39b3e812194cc47 F src/wherecode.c ccaedd1965710e9ae35beaea59ac0ae08eb3562ab33b3a4190624b62a2e73338
F src/whereexpr.c 2a05552e808047a93845278c98c6ca64a265fa8e9ffd087c161bb11bfe339866 F src/whereexpr.c 2a05552e808047a93845278c98c6ca64a265fa8e9ffd087c161bb11bfe339866
F src/window.c edd6f5e25a1e8f2b6f5305b7f5f7da7bb35f07f0d432b255b1d4c2fcab4205aa F src/window.c edd6f5e25a1e8f2b6f5305b7f5f7da7bb35f07f0d432b255b1d4c2fcab4205aa
F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
@@ -1880,7 +1880,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
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manifest.uuid
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@@ -1 +1 @@
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src/wherecode.c
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@@ -1807,7 +1807,16 @@ Bitmask sqlite3WhereCodeOneLoopStart(
if( (pLoop->wsFlags & WHERE_IN_SEEKSCAN)!=0 ){ if( (pLoop->wsFlags & WHERE_IN_SEEKSCAN)!=0 ){
assert( op==OP_SeekGE ); assert( op==OP_SeekGE );
assert( regBignull==0 ); assert( regBignull==0 );
sqlite3VdbeAddOp1(v, OP_SeekScan, 10); VdbeCoverage(v); /* TUNING: The OP_SeekScan opcode seeks to reduce the number
** of expensive seek operations by replacing a single seek with
** 1 or more step operations. The question is, how many steps
** should we try before giving up and going with a seek. The cost
** of a seek is proportional to the logarithm of the of the number
** of entries in the tree, so basing the number of steps to try
** on the estimated number of rows in the btree seems like a good
** guess. */
sqlite3VdbeAddOp1(v, OP_SeekScan, (pIdx->aiRowLogEst[0]+9)/10);
VdbeCoverage(v);
} }
sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase, nConstraint); sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase, nConstraint);
VdbeCoverage(v); VdbeCoverage(v);