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Add evidence marks to the where.c source file. Comment only - no code changes.

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FossilOrigin-Name: f3f9e8e5bb90cc36e0d63a7289a8acf534c5fa2a
This commit is contained in:
drh
2010-07-22 22:40:03 +00:00
parent 2339f06714
commit e9cdceafab
3 changed files with 46 additions and 12 deletions
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32
src/where.c
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@@ -327,6 +327,7 @@ static void whereClauseClear(WhereClause *pWC){
static int whereClauseInsert(WhereClause *pWC, Expr *p, u8 wtFlags){
WhereTerm *pTerm;
int idx;
testcase( wtFlags & TERM_VIRTUAL ); /* EV: R-00211-15100 */
if( pWC->nTerm>=pWC->nSlot ){
WhereTerm *pOld = pWC->a;
sqlite3 *db = pWC->pParse->db;
@@ -472,6 +473,13 @@ static Bitmask exprSelectTableUsage(WhereMaskSet *pMaskSet, Select *pS){
** Return TRUE if the given operator is one of the operators that is
** allowed for an indexable WHERE clause term. The allowed operators are
** "=", "<", ">", "<=", ">=", and "IN".
**
** IMPLEMENTATION-OF: R-59926-26393 To be usable by an index a term must be
** of one of the following forms: column = expression column > expression
** column >= expression column < expression column <= expression
** expression = column expression > column expression >= column
** expression < column expression <= column column IN
** (expression-list) column IN (subquery) column IS NULL
*/
static int allowedOp(int op){
assert( TK_GT>TK_EQ && TK_GT<TK_GE );
@@ -1016,6 +1024,8 @@ static void exprAnalyzeOrTerm(
/* At this point, okToChngToIN is true if original pTerm satisfies
** case 1. In that case, construct a new virtual term that is
** pTerm converted into an IN operator.
**
** EV: R-00211-15100
*/
if( okToChngToIN ){
Expr *pDup; /* A transient duplicate expression */
@@ -1247,7 +1257,8 @@ static void exprAnalyze(
** inequality. To avoid this, make sure to also run the full
** LIKE on all candidate expressions by clearing the isComplete flag
*/
if( c=='A'-1 ) isComplete = 0;
if( c=='A'-1 ) isComplete = 0; /* EV: R-64339-08207 */
c = sqlite3UpperToLower[c];
}
@@ -2879,6 +2890,9 @@ static void bestIndex(
** in the ON clause. The term is disabled in (3) because it is not part
** of a LEFT OUTER JOIN. In (1), the term is not disabled.
**
** IMPLEMENTATION-OF: R-24597-58655 No tests are done for terms that are
** completely satisfied by indices.
**
** Disabling a term causes that term to not be tested in the inner loop
** of the join. Disabling is an optimization. When terms are satisfied
** by indices, we disable them to prevent redundant tests in the inner
@@ -3090,6 +3104,7 @@ static int codeAllEqualityTerms(
/* The following true for indices with redundant columns.
** Ex: CREATE INDEX i1 ON t1(a,b,a); SELECT * FROM t1 WHERE a=0 AND b=0; */
testcase( (pTerm->wtFlags & TERM_CODED)!=0 );
testcase( pTerm->wtFlags & TERM_VIRTUAL ); /* EV: R-30575-11662 */
r1 = codeEqualityTerm(pParse, pTerm, pLevel, regBase+j);
if( r1!=regBase+j ){
if( nReg==1 ){
@@ -3233,6 +3248,7 @@ static Bitmask codeOneLoopStart(
assert( pTerm->pExpr!=0 );
assert( pTerm->leftCursor==iCur );
assert( omitTable==0 );
testcase( pTerm->wtFlags & TERM_VIRTUAL ); /* EV: R-30575-11662 */
iRowidReg = codeEqualityTerm(pParse, pTerm, pLevel, iReleaseReg);
addrNxt = pLevel->addrNxt;
sqlite3VdbeAddOp2(v, OP_MustBeInt, iRowidReg, addrNxt);
@@ -3273,6 +3289,7 @@ static Bitmask codeOneLoopStart(
assert( TK_LT==TK_GT+2 ); /* ... of the TK_xx values... */
assert( TK_GE==TK_GT+3 ); /* ... is correcct. */
testcase( pStart->wtFlags & TERM_VIRTUAL ); /* EV: R-30575-11662 */
pX = pStart->pExpr;
assert( pX!=0 );
assert( pStart->leftCursor==iCur );
@@ -3290,6 +3307,7 @@ static Bitmask codeOneLoopStart(
pX = pEnd->pExpr;
assert( pX!=0 );
assert( pEnd->leftCursor==iCur );
testcase( pEnd->wtFlags & TERM_VIRTUAL ); /* EV: R-30575-11662 */
memEndValue = ++pParse->nMem;
sqlite3ExprCode(pParse, pX->pRight, memEndValue);
if( pX->op==TK_LT || pX->op==TK_GT ){
@@ -3457,6 +3475,7 @@ static Bitmask codeOneLoopStart(
}
}
nConstraint++;
testcase( pRangeStart->wtFlags & TERM_VIRTUAL ); /* EV: R-30575-11662 */
}else if( isMinQuery ){
sqlite3VdbeAddOp2(v, OP_Null, 0, regBase+nEq);
nConstraint++;
@@ -3496,6 +3515,7 @@ static Bitmask codeOneLoopStart(
}
codeApplyAffinity(pParse, regBase, nEq+1, zEndAff);
nConstraint++;
testcase( pRangeEnd->wtFlags & TERM_VIRTUAL ); /* EV: R-30575-11662 */
}
sqlite3DbFree(pParse->db, zStartAff);
sqlite3DbFree(pParse->db, zEndAff);
@@ -3702,11 +3722,15 @@ static Bitmask codeOneLoopStart(
/* Insert code to test every subexpression that can be completely
** computed using the current set of tables.
**
** IMPLEMENTATION-OF: R-49525-50935 Terms that cannot be satisfied through
** the use of indices become tests that are evaluated against each row of
** the relevant input tables.
*/
k = 0;
for(pTerm=pWC->a, j=pWC->nTerm; j>0; j--, pTerm++){
Expr *pE;
testcase( pTerm->wtFlags & TERM_VIRTUAL );
testcase( pTerm->wtFlags & TERM_VIRTUAL ); /* IMP: R-30575-11662 */
testcase( pTerm->wtFlags & TERM_CODED );
if( pTerm->wtFlags & (TERM_VIRTUAL|TERM_CODED) ) continue;
if( (pTerm->prereqAll & notReady)!=0 ){
@@ -3734,7 +3758,7 @@ static Bitmask codeOneLoopStart(
VdbeComment((v, "record LEFT JOIN hit"));
sqlite3ExprCacheClear(pParse);
for(pTerm=pWC->a, j=0; j<pWC->nTerm; j++, pTerm++){
testcase( pTerm->wtFlags & TERM_VIRTUAL );
testcase( pTerm->wtFlags & TERM_VIRTUAL ); /* IMP: R-30575-11662 */
testcase( pTerm->wtFlags & TERM_CODED );
if( pTerm->wtFlags & (TERM_VIRTUAL|TERM_CODED) ) continue;
if( (pTerm->prereqAll & notReady)!=0 ){
@@ -3952,7 +3976,7 @@ WhereInfo *sqlite3WhereBegin(
initMaskSet(pMaskSet);
whereClauseInit(pWC, pParse, pMaskSet);
sqlite3ExprCodeConstants(pParse, pWhere);
whereSplit(pWC, pWhere, TK_AND);
whereSplit(pWC, pWhere, TK_AND); /* IMP: R-15842-53296 */
/* Special case: a WHERE clause that is constant. Evaluate the
** expression and either jump over all of the code or fall thru.