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Improvments to debug output on the star-query heuristic.

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FossilOrigin-Name: b3ebeb0682a2c837987acf4ed92f06cf91aea235830c5a0f9dd1ce64afe16e84
This commit is contained in:
drh
2025-01-25 14:30:36 +00:00
parent dea434ea65
commit 0186ee1cd7
4 changed files with 28 additions and 14 deletions
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4
src/sqliteInt.h
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@ -1151,7 +1151,7 @@ extern u32 sqlite3WhereTrace;
** 0xFFFF---- Low-level debug messages
**
** 0x00000001 Code generation
** 0x00000002 Solver
** 0x00000002 Solver (Use 0x40000 for less detail)
** 0x00000004 Solver costs
** 0x00000008 WhereLoop inserts
**
@ -1170,6 +1170,8 @@ extern u32 sqlite3WhereTrace;
**
** 0x00010000 Show more detail when printing WHERE terms
** 0x00020000 Show WHERE terms returned from whereScanNext()
** 0x00040000 Solver overview messages
** 0x00080000 Star-query heuristic
*/

22
src/where.c
View File

@ -5544,8 +5544,8 @@ static int computeMxChoice(WhereInfo *pWInfo){
}
if( nDep<=3 ) continue;
rDelta = 15*(nDep-3);
#ifdef WHERETRACE_ENABLED /* 0x4 */
if( sqlite3WhereTrace&0x4 ){
#ifdef WHERETRACE_ENABLED /* 0x80000 */
if( sqlite3WhereTrace & 0x80000 ){
Bitmask x;
int ii;
sqlite3DebugPrintf(
@ -5564,10 +5564,12 @@ static int computeMxChoice(WhereInfo *pWInfo){
sqlite3DebugPrintf("\n");
}
#endif
for(pWLoop=pWInfo->pLoops; pWLoop; pWLoop=pWLoop->pNextLoop){
pWLoop->rStarDelta = 0;
if( pWInfo->nOutStarDelta==0 ){
for(pWLoop=pWInfo->pLoops; pWLoop; pWLoop=pWLoop->pNextLoop){
pWLoop->rStarDelta = 0;
}
}
pWInfo->nOutStarDelta = rDelta;
pWInfo->nOutStarDelta += rDelta;
for(pWLoop=pWInfo->pLoops; pWLoop; pWLoop=pWLoop->pNextLoop){
if( pWLoop->maskSelf==m ){
pWLoop->rRun -= rDelta;
@ -5576,6 +5578,16 @@ static int computeMxChoice(WhereInfo *pWInfo){
}
}
}
#ifdef WHERETRACE_ENABLED /* 0x80000 */
if( (sqlite3WhereTrace & 0x80000)!=0 && pWInfo->nOutStarDelta ){
sqlite3DebugPrintf("WhereLoops changed by star-query heuristic:\n");
for(pWLoop=pWInfo->pLoops; pWLoop; pWLoop=pWLoop->pNextLoop){
if( pWLoop->rStarDelta ){
sqlite3WhereLoopPrint(pWLoop, &pWInfo->sWC);
}
}
}
#endif
}
return pWInfo->nOutStarDelta>0 ? 18 : 12;
}