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Add some sample requirement implementation comments to where.c.

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FossilOrigin-Name: 9854ad00aed08793ae7ba3c2cfbab7a2dba4dcb8
This commit is contained in:
drh
2009-10-22 20:50:36 +00:00
parent ad6b8d073d
commit d91ca49a4e
4 changed files with 30 additions and 408 deletions
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16
src/where.c
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@@ -648,17 +648,25 @@ static int isLikeOrGlob(
#endif
pList = pExpr->x.pList;
pLeft = pList->a[1].pExpr;
if( pLeft->op!=TK_COLUMN ){
if( pLeft->op!=TK_COLUMN || sqlite3ExprAffinity(pLeft)!=SQLITE_AFF_TEXT ){
/* IMP: R-02065-49465 The left-hand side of the LIKE or GLOB operator must
** be the name of an indexed column with TEXT affinity. */
return 0;
}
assert( pLeft->iColumn!=(-1) ); /* Because IPK never has AFF_TEXT */
pColl = sqlite3ExprCollSeq(pParse, pLeft);
assert( pColl!=0 || pLeft->iColumn==-1 );
if( pColl==0 ) return 0;
assert( pColl!=0 ); /* Every non-IPK column has a collating sequence */
if( (pColl->type!=SQLITE_COLL_BINARY || *pnoCase) &&
(pColl->type!=SQLITE_COLL_NOCASE || !*pnoCase) ){
/* IMP: R-09003-32046 For the GLOB operator, the column must use the
** default BINARY collating sequence.
** IMP: R-41408-28306 For the LIKE operator, if case_sensitive_like mode
** is enabled then the column must use the default BINARY collating
** sequence, or if case_sensitive_like mode is disabled then the column
** must use the built-in NOCASE collating sequence.
*/
return 0;
}
if( sqlite3ExprAffinity(pLeft)!=SQLITE_AFF_TEXT ) return 0;
pRight = pList->a[0].pExpr;
op = pRight->op;