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Enhancements to the xBestIndex output from the ext/misc/vtablog.c

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extension.

FossilOrigin-Name: 8b31acc0b18f38eb4af6efebd1ea25cd65a146651101579aee20afd9ec6dc2de
This commit is contained in:
drh
2025-07-03 14:10:03 +00:00
parent bfb4993364
commit 1ff6f19d8b
3 changed files with 62 additions and 10 deletions
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58
ext/misc/vtablog.c
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@ -435,6 +435,39 @@ static int vtablogFilter(
return SQLITE_OK;
}
/*
** Return an sqlite3_index_info operator name in static space.
** The name is possibly overwritten on subsequent calls.
*/
static char *vtablogOpName(unsigned char op){
static char zUnknown[30];
char *zOut;
switch( op ){
case SQLITE_INDEX_CONSTRAINT_EQ: zOut = "EQ"; break;
case SQLITE_INDEX_CONSTRAINT_GT: zOut = "GT"; break;
case SQLITE_INDEX_CONSTRAINT_LE: zOut = "LE"; break;
case SQLITE_INDEX_CONSTRAINT_LT: zOut = "LT"; break;
case SQLITE_INDEX_CONSTRAINT_GE: zOut = "GE"; break;
case SQLITE_INDEX_CONSTRAINT_MATCH: zOut = "MATCH"; break;
case SQLITE_INDEX_CONSTRAINT_LIKE: zOut = "LIKE"; break;
case SQLITE_INDEX_CONSTRAINT_GLOB: zOut = "GLOB"; break;
case SQLITE_INDEX_CONSTRAINT_REGEXP: zOut = "REGEXP"; break;
case SQLITE_INDEX_CONSTRAINT_NE: zOut = "NE"; break;
case SQLITE_INDEX_CONSTRAINT_ISNOT: zOut = "ISNOT"; break;
case SQLITE_INDEX_CONSTRAINT_ISNOTNULL: zOut = "ISNOTNULL"; break;
case SQLITE_INDEX_CONSTRAINT_ISNULL: zOut = "ISNULL"; break;
case SQLITE_INDEX_CONSTRAINT_IS: zOut = "IS"; break;
case SQLITE_INDEX_CONSTRAINT_LIMIT: zOut = "LIMIT"; break;
case SQLITE_INDEX_CONSTRAINT_OFFSET: zOut = "OFFSET"; break;
case SQLITE_INDEX_CONSTRAINT_FUNCTION: zOut = "FUNCTION"; break;
default:
sqlite3_snprintf(sizeof(zUnknown),zUnknown,"%d",op);
zOut = zUnknown;
break;
}
return zOut;
}
/*
** SQLite will invoke this method one or more times while planning a query
** that uses the vtablog virtual table. This routine needs to create
@ -451,14 +484,33 @@ static int vtablogBestIndex(
printf(" colUsed: 0x%016llx\n", p->colUsed);
printf(" nConstraint: %d\n", p->nConstraint);
for(i=0; i<p->nConstraint; i++){
sqlite3_value *pVal = 0;
int rc;
char zRhs[50];
rc = sqlite3_vtab_rhs_value(p, i, &pVal);
if( rc==SQLITE_OK ){
switch( sqlite3_value_type(pVal) ){
case SQLITE_NULL: sqlite3_snprintf(50,zRhs,"NULL"); break;
case SQLITE_INTEGER: sqlite3_snprintf(50,zRhs,"%lld",
sqlite3_value_int64(pVal)); break;
case SQLITE_FLOAT: sqlite3_snprintf(50,zRhs,"%g",
sqlite3_value_double(pVal)); break;
case SQLITE_TEXT: sqlite3_snprintf(50,zRhs,"TEXT"); break;
default: sqlite3_snprintf(50,zRhs,"BLOB"); break;
}
}else{
sqlite3_snprintf(50,zRhs,"N/A");
}
printf(
" constraint[%d]: col=%d termid=%d op=%d usabled=%d collseq=%s\n",
" constraint[%d]: col=%d termid=%d op=%s usabled=%d coll=%s rhs=%s\n",
i,
p->aConstraint[i].iColumn,
p->aConstraint[i].iTermOffset,
p->aConstraint[i].op,
vtablogOpName(p->aConstraint[i].op),
p->aConstraint[i].usable,
sqlite3_vtab_collation(p,i));
sqlite3_vtab_collation(p,i),
zRhs
);
}
printf(" nOrderBy: %d\n", p->nOrderBy);
for(i=0; i<p->nOrderBy; i++){