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Do not activate the truthProb adjustment mechanism if the truth probability

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is less than the heuristic value, as there could be correlations unknown to
stat4.  Also add additional tracing output to make truthProb adjustments more
visible.

FossilOrigin-Name: c535fea147ce5c6e4aab25d3c85a3f53a7364c5b5ee10fb6d393c5911a02be7e
This commit is contained in:
drh 2020-02-22 18:27:48 +00:00
parent 5c19346451
commit cea1951e80
3 changed files with 40 additions and 23 deletions
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14
manifest
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@ -1,5 +1,5 @@
C Add\snew\stest\sfile\sanalyzeG.test,\scontaining\sa\stest\sfor\sthe\schange\son\sthis\sbranch.
D 2020-02-22T17:32:00.691
C Do\snot\sactivate\sthe\struthProb\sadjustment\smechanism\sif\sthe\struth\sprobability\nis\sless\sthan\sthe\sheuristic\svalue,\sas\sthere\scould\sbe\scorrelations\sunknown\sto\nstat4.\s\sAlso\sadd\sadditional\stracing\soutput\sto\smake\struthProb\sadjustments\smore\nvisible.
D 2020-02-22T18:27:48.175
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -617,7 +617,7 @@ F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
F src/wal.c 697424314e40d99f93f548c7bfa526c10e87f4bdf64d5a76a96b999dd7133ebc
F src/wal.h 606292549f5a7be50b6227bd685fa76e3a4affad71bb8ac5ce4cb5c79f6a176a
F src/walker.c a137468bf36c92e64d2275caa80c83902e3a0fc59273591b96c6416d3253d05d
F src/where.c 74a2fc5a900eab9a2fdda2017a290f0eeaa9c5597fdb86322ea2ccbc3758c71d
F src/where.c 44695e878a287d8c1d4976e2e85bea29994facec3972beb7ca22437d62cda6a5
F src/whereInt.h 94e3aadcf43b4d16279182d147c9e4f8ef6ed5a5bd1ecc021639c29336b0a3eb
F src/wherecode.c f5df56e395ade2240cabb2d39500c681bd29f8cc0636c3301c4996ad160df94d
F src/whereexpr.c 264d58971eaf8256eb5b0917bcd7fc7a1f1109fdda183a8382308a1b18a2dce7
@ -1859,7 +1859,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P 1babd6ec5d60e2c34aa1c0285ead768a88004218468e97262411973fe3487022
R 2b88c80f8c57b2c7447cf9a6931d1437
U dan
Z e854d74d6063f88b5d388938dfbba4ed
P 243ab1852a2291595527ea1f26e78ad83eda285ae28f876bc1c703677f495cfa
R 2719b1105cf4d47b954b372c20702e91
U drh
Z e3872ca3639b1687907dbcae881883fa

2
manifest.uuid
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@ -1 +1 @@
243ab1852a2291595527ea1f26e78ad83eda285ae28f876bc1c703677f495cfa
c535fea147ce5c6e4aab25d3c85a3f53a7364c5b5ee10fb6d393c5911a02be7e

47
src/where.c
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@ -2305,7 +2305,7 @@ static void whereLoopOutputAdjust(
if( sqlite3ExprIsInteger(pRight, &k) && k>=(-1) && k<=1 ){
k = 10;
}else{
k = 20;
k = 20; /* Keep the "20" value in sync. See tag-20200222-1 */
}
if( iReduce<k ){
pTerm->wtFlags |= TERM_HEURTRUTH;
@ -2659,7 +2659,13 @@ static int whereLoopAddBtreeIndex(
if( rc!=SQLITE_OK ) break; /* Jump out of the pTerm loop */
if( nOut ){
pNew->nOut = sqlite3LogEst(nOut);
if( nEq==1 && pTerm->truthProb>0 ){
if( nEq==1
&& pTerm->truthProb>0
/* TUNING: Adjust truthProb from the default heuristic only if the
** probability is close to 1.0. The "20" constant is copied from
** the heuristic at tag-20200222-1. Keep values in sync */
&& pNew->nOut+20 > pProbe->aiRowLogEst[0]
){
#if WHERETRACE_ENABLED /* 0x01 */
if( sqlite3WhereTrace & 0x01 ){
sqlite3DebugPrintf("Update truthProb from %d to %d:\n",
@ -4555,6 +4561,28 @@ static int exprIsDeterministic(Expr *p){
return w.eCode;
}
#ifdef WHERETRACE_ENABLED
/*
** Display all WhereLoops in pWInfo
*/
static void showAllWhereLoops(WhereInfo *pWInfo, WhereClause *pWC){
if( sqlite3WhereTrace ){ /* Display all of the WhereLoop objects */
WhereLoop *p;
int i;
static const char zLabel[] = "0123456789abcdefghijklmnopqrstuvwyxz"
"ABCDEFGHIJKLMNOPQRSTUVWYXZ";
for(p=pWInfo->pLoops, i=0; p; p=p->pNextLoop, i++){
p->cId = zLabel[i%(sizeof(zLabel)-1)];
sqlite3WhereLoopPrint(p, pWC);
}
}
}
# define WHERETRACE_ALL_LOOPS(W,C) showAllWhereLoops(W,C)
#else
# define WHERETRACE_ALL_LOOPS(W,C)
#endif
/*
** Generate the beginning of the loop used for WHERE clause processing.
** The return value is a pointer to an opaque structure that contains
@ -4864,6 +4892,7 @@ WhereInfo *sqlite3WhereBegin(
** then we need to rerun the whole loop building process so that all
** loops will be built using the revised truthProb values. */
if( sWLB.bldFlags2 & SQLITE_BLDF2_2NDPASS ){
WHERETRACE_ALL_LOOPS(pWInfo, sWLB.pWC);
WHERETRACE(0xffff,
("**** Redo all loop computations due to truthProb changes ****\n"));
while( pWInfo->pLoops ){
@ -4875,19 +4904,7 @@ WhereInfo *sqlite3WhereBegin(
if( rc ) goto whereBeginError;
}
#endif
#ifdef WHERETRACE_ENABLED
if( sqlite3WhereTrace ){ /* Display all of the WhereLoop objects */
WhereLoop *p;
int i;
static const char zLabel[] = "0123456789abcdefghijklmnopqrstuvwyxz"
"ABCDEFGHIJKLMNOPQRSTUVWYXZ";
for(p=pWInfo->pLoops, i=0; p; p=p->pNextLoop, i++){
p->cId = zLabel[i%(sizeof(zLabel)-1)];
sqlite3WhereLoopPrint(p, sWLB.pWC);
}
}
#endif
WHERETRACE_ALL_LOOPS(pWInfo, sWLB.pWC);
wherePathSolver(pWInfo, 0);
if( db->mallocFailed ) goto whereBeginError;