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Overview
| Comment: | Indexes on expressions with a COLLATE clause are able to satisfy an ORDER BY with the same COLLATE clause. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
0413001843dce7c63659d39b329ca14c |
| User & Date: | drh 2017-09-28 01:09:42 |
Context
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2017-09-28
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| 01:58 | Add new routines to simplify dealing with collating sequences in expressions: sqlite3ExprNNCollSeq() and sqlite3ExprCollSeqMatch(). (check-in: 490e488e user: drh tags: trunk) | |
| 01:09 | Indexes on expressions with a COLLATE clause are able to satisfy an ORDER BY with the same COLLATE clause. (check-in: 04130018 user: drh tags: trunk) | |
| 00:01 | In two places, change the magic number -1 to its proper symbol XN_ROWID. (check-in: 80277d2f user: drh tags: trunk) | |
Changes
Changes to src/where.c.
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if( pExpr->iColumn<0 ) return 1;
for(jj=0; jj<pIndex->nKeyCol; jj++){
if( pExpr->iColumn==pIndex->aiColumn[jj] ) return 1;
}
}else if( (aColExpr = pIndex->aColExpr)!=0 ){
for(jj=0; jj<pIndex->nKeyCol; jj++){
if( pIndex->aiColumn[jj]!=XN_EXPR ) continue;
if( sqlite3ExprCompare(0, pExpr,aColExpr->a[jj].pExpr,iCursor)==0 ){
return 1;
}
}
}
}
return 0;
}
................................................................................
testcase( wctrlFlags & WHERE_DISTINCTBY );
if( (wctrlFlags & (WHERE_GROUPBY|WHERE_DISTINCTBY))==0 ) bOnce = 0;
if( iColumn>=XN_ROWID ){
if( pOBExpr->op!=TK_COLUMN ) continue;
if( pOBExpr->iTable!=iCur ) continue;
if( pOBExpr->iColumn!=iColumn ) continue;
}else{
if( sqlite3ExprCompare(0,
pOBExpr,pIndex->aColExpr->a[j].pExpr,iCur) ){
continue;
}
}
if( iColumn!=XN_ROWID ){
pColl = sqlite3ExprCollSeq(pWInfo->pParse, pOrderBy->a[i].pExpr);
if( !pColl ) pColl = db->pDfltColl;
if( sqlite3StrICmp(pColl->zName, pIndex->azColl[j])!=0 ) continue;
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if( pExpr->iColumn<0 ) return 1;
for(jj=0; jj<pIndex->nKeyCol; jj++){
if( pExpr->iColumn==pIndex->aiColumn[jj] ) return 1;
}
}else if( (aColExpr = pIndex->aColExpr)!=0 ){
for(jj=0; jj<pIndex->nKeyCol; jj++){
if( pIndex->aiColumn[jj]!=XN_EXPR ) continue;
if( sqlite3ExprCompareSkip(pExpr,aColExpr->a[jj].pExpr,iCursor)==0 ){
return 1;
}
}
}
}
return 0;
}
................................................................................
testcase( wctrlFlags & WHERE_DISTINCTBY );
if( (wctrlFlags & (WHERE_GROUPBY|WHERE_DISTINCTBY))==0 ) bOnce = 0;
if( iColumn>=XN_ROWID ){
if( pOBExpr->op!=TK_COLUMN ) continue;
if( pOBExpr->iTable!=iCur ) continue;
if( pOBExpr->iColumn!=iColumn ) continue;
}else{
Expr *pIdxExpr = pIndex->aColExpr->a[j].pExpr;
if( sqlite3ExprCompareSkip(pOBExpr, pIdxExpr, iCur) ){
continue;
}
}
if( iColumn!=XN_ROWID ){
pColl = sqlite3ExprCollSeq(pWInfo->pParse, pOrderBy->a[i].pExpr);
if( !pColl ) pColl = db->pDfltColl;
if( sqlite3StrICmp(pColl->zName, pIndex->azColl[j])!=0 ) continue;
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Changes to test/indexexpr2.test.
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CREATE INDEX i4 ON t4( substr(a, 2) COLLATE NOCASE, b );
SELECT * FROM t4
WHERE substr(a, 2) = 'abc' COLLATE NOCASE
ORDER BY substr(a, 2), b;
} {
.ABC 1 .ABC 3 .abc 2 .abc 4
}
finish_test
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> > > > > > > > > > > > > > > > > > > > > > |
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CREATE INDEX i4 ON t4( substr(a, 2) COLLATE NOCASE, b );
SELECT * FROM t4
WHERE substr(a, 2) = 'abc' COLLATE NOCASE
ORDER BY substr(a, 2), b;
} {
.ABC 1 .ABC 3 .abc 2 .abc 4
}
do_execsql_test 3.4.3 {
DROP INDEX i4;
UPDATE t4 SET a = printf('%s%d',a,b);
SELECT * FROM t4 ORDER BY Substr(a,-2) COLLATE nocase;
} {.ABC1 1 .abc2 2 .ABC3 3 .abc4 4}
do_execsql_test 3.4.4 {
SELECT * FROM t4 ORDER BY Substr(a,-2) COLLATE binary;
} {.ABC1 1 .ABC3 3 .abc2 2 .abc4 4}
do_execsql_test 3.4.5 {
CREATE INDEX i4 ON t4( Substr(a,-2) COLLATE nocase );
SELECT * FROM t4 ORDER BY Substr(a,-2) COLLATE nocase;
} {.ABC1 1 .abc2 2 .ABC3 3 .abc4 4}
do_execsql_test 3.4.5eqp {
EXPLAIN QUERY PLAN
SELECT * FROM t4 ORDER BY Substr(a,-2) COLLATE nocase;
} {/SCAN TABLE t4 USING INDEX i4/}
do_execsql_test 3.4.6 {
SELECT * FROM t4 ORDER BY Substr(a,-2) COLLATE binary;
} {.ABC1 1 .ABC3 3 .abc2 2 .abc4 4}
finish_test
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