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Overview
| Comment: | Enhance location(X) so that it works with indexes and WITHOUT ROWID tables. The function might return an offset to the main table or to an index, depending on whether the column X would be loaded from the main table or from the index. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | location-function |
| Files: | files | file ages | folders |
| SHA3-256: |
dd94d6a880dfec4bddd247239b815b84 |
| User & Date: | drh 2017-12-29 14:33:54 |
Context
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2017-12-29
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| 15:04 | Change the function name to sqlite_unsupported_offset(X). Only enable the function if compiled with -DSQLITE_ENABLE_OFFSET_SQL_FUNC. The makefiles add that definition to shell builds. (check-in: 7a7f826e user: drh tags: location-function) | |
| 14:33 | Enhance location(X) so that it works with indexes and WITHOUT ROWID tables. The function might return an offset to the main table or to an index, depending on whether the column X would be loaded from the main table or from the index. (check-in: dd94d6a8 user: drh tags: location-function) | |
| 13:35 | Merge recent enhancements from trunk. (check-in: 6251e438 user: drh tags: location-function) | |
Changes
Changes to src/btree.c.
4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 |
/*
** Return the offset into the database file for the start of the
** payload to which the cursor is pointing.
*/
i64 sqlite3BtreeLocation(BtCursor *pCur){
assert( cursorHoldsMutex(pCur) );
assert( pCur->eState==CURSOR_VALID );
assert( pCur->curIntKey );
getCellInfo(pCur);
return (i64)pCur->pBt->pageSize*(i64)pCur->pPage->pgno +
(i64)(pCur->info.pPayload - pCur->pPage->aData);
}
/*
** Return the number of bytes of payload for the entry that pCur is
** currently pointing to. For table btrees, this will be the amount
** of data. For index btrees, this will be the size of the key.
|
< | |
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/*
** Return the offset into the database file for the start of the
** payload to which the cursor is pointing.
*/
i64 sqlite3BtreeLocation(BtCursor *pCur){
assert( cursorHoldsMutex(pCur) );
assert( pCur->eState==CURSOR_VALID );
getCellInfo(pCur);
return (i64)pCur->pBt->pageSize*((i64)pCur->pPage->pgno - 1) +
(i64)(pCur->info.pPayload - pCur->pPage->aData);
}
/*
** Return the number of bytes of payload for the entry that pCur is
** currently pointing to. For table btrees, this will be the amount
** of data. For index btrees, this will be the size of the key.
|
Changes to src/expr.c.
3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 |
if( pDef->funcFlags & SQLITE_FUNC_NEEDCOLL ){
if( !pColl ) pColl = db->pDfltColl;
sqlite3VdbeAddOp4(v, OP_CollSeq, 0, 0, 0, (char *)pColl, P4_COLLSEQ);
}
if( pDef->funcFlags & SQLITE_FUNC_LOCATION ){
Expr *pArg = pFarg->a[0].pExpr;
if( pArg->op==TK_COLUMN ){
sqlite3VdbeAddOp2(v, OP_Location, pArg->iTable, target);
}else{
sqlite3VdbeAddOp2(v, OP_Null, 0, target);
}
}else{
sqlite3VdbeAddOp4(v, pParse->iSelfTab ? OP_PureFunc0 : OP_Function0,
constMask, r1, target, (char*)pDef, P4_FUNCDEF);
sqlite3VdbeChangeP5(v, (u8)nFarg);
|
| |
3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 |
if( pDef->funcFlags & SQLITE_FUNC_NEEDCOLL ){
if( !pColl ) pColl = db->pDfltColl;
sqlite3VdbeAddOp4(v, OP_CollSeq, 0, 0, 0, (char *)pColl, P4_COLLSEQ);
}
if( pDef->funcFlags & SQLITE_FUNC_LOCATION ){
Expr *pArg = pFarg->a[0].pExpr;
if( pArg->op==TK_COLUMN ){
sqlite3VdbeAddOp3(v, OP_Location, pArg->iTable, pArg->iColumn,target);
}else{
sqlite3VdbeAddOp2(v, OP_Null, 0, target);
}
}else{
sqlite3VdbeAddOp4(v, pParse->iSelfTab ? OP_PureFunc0 : OP_Function0,
constMask, r1, target, (char*)pDef, P4_FUNCDEF);
sqlite3VdbeChangeP5(v, (u8)nFarg);
|
Changes to src/vdbe.c.
2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 |
if( p->apCsr[pOp->p1]->nullRow ){
sqlite3VdbeMemSetNull(aMem + pOp->p3);
goto jump_to_p2;
}
break;
}
/* Opcode: Location P1 P2 * * *
** Synopsis: r[P2] = location(P1)
**
** Store in register r[P2] the location in the database file that is the
** start of the payload for the record at which that cursor P1 is currently
** pointing.
*/
case OP_Location: { /* out2 */
VdbeCursor *pC; /* The VDBE cursor */
assert( pOp->p1>=0 && pOp->p1<p->nCursor );
pC = p->apCsr[pOp->p1];
pOut = out2Prerelease(p, pOp);
if( pC==0 || pC->eCurType!=CURTYPE_BTREE ){
pOut->flags = MEM_Null;
}else{
pOut->u.i = sqlite3BtreeLocation(pC->uc.pCursor);
}
break;
}
/* Opcode: Column P1 P2 P3 P4 P5
** Synopsis: r[P3]=PX
**
|
| | | > > > > > | | | | |
2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 |
if( p->apCsr[pOp->p1]->nullRow ){
sqlite3VdbeMemSetNull(aMem + pOp->p3);
goto jump_to_p2;
}
break;
}
/* Opcode: Location P1 P2 P3 * *
** Synopsis: r[P3] = location(P1)
**
** Store in register r[P3] the location in the database file that is the
** start of the payload for the record at which that cursor P1 is currently
** pointing.
**
** P2 is the column number for the argument to the location() function.
** This opcode does not use P2 itself, but the P2 value is used by the
** code generator. The P1, P2, and P3 operands to this opcode are the
** as as for OP_Column.
*/
case OP_Location: { /* out3 */
VdbeCursor *pC; /* The VDBE cursor */
assert( pOp->p1>=0 && pOp->p1<p->nCursor );
pC = p->apCsr[pOp->p1];
pOut = &p->aMem[pOp->p3];
if( pC==0 || pC->eCurType!=CURTYPE_BTREE ){
sqlite3VdbeMemSetNull(pOut);
}else{
sqlite3VdbeMemSetInt64(pOut, sqlite3BtreeLocation(pC->uc.pCursor));
}
break;
}
/* Opcode: Column P1 P2 P3 P4 P5
** Synopsis: r[P3]=PX
**
|
Changes to src/where.c.
5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 |
&& !db->mallocFailed
){
last = sqlite3VdbeCurrentAddr(v);
k = pLevel->addrBody;
pOp = sqlite3VdbeGetOp(v, k);
for(; k<last; k++, pOp++){
if( pOp->p1!=pLevel->iTabCur ) continue;
if( pOp->opcode==OP_Column ){
int x = pOp->p2;
assert( pIdx->pTable==pTab );
if( !HasRowid(pTab) ){
Index *pPk = sqlite3PrimaryKeyIndex(pTab);
x = pPk->aiColumn[x];
assert( x>=0 );
}
|
| |
5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 |
&& !db->mallocFailed
){
last = sqlite3VdbeCurrentAddr(v);
k = pLevel->addrBody;
pOp = sqlite3VdbeGetOp(v, k);
for(; k<last; k++, pOp++){
if( pOp->p1!=pLevel->iTabCur ) continue;
if( pOp->opcode==OP_Column || pOp->opcode==OP_Location ){
int x = pOp->p2;
assert( pIdx->pTable==pTab );
if( !HasRowid(pTab) ){
Index *pPk = sqlite3PrimaryKeyIndex(pTab);
x = pPk->aiColumn[x];
assert( x>=0 );
}
|
Changes to test/func6.test.
24 25 26 27 28 29 30 31 32 33 34 35 36 |
} {abc001 integer abc002 integer}
do_execsql_test func6-120 {
SELECT a, typeof(location(+a)) FROM t1 ORDER BY rowid LIMIT 2;
} {abc001 null abc002 null}
do_execsql_test func6-130 {
CREATE INDEX t1a ON t1(a);
SELECT a, typeof(location(a)) FROM t1 ORDER BY a LIMIT 2;
} {abc001 null abc002 null}
do_execsql_test func6-140 {
SELECT a, typeof(location(a)) FROM t1 NOT INDEXED ORDER BY a LIMIT 2;
} {abc001 integer abc002 integer}
finish_test
|
| |
24 25 26 27 28 29 30 31 32 33 34 35 36 |
} {abc001 integer abc002 integer}
do_execsql_test func6-120 {
SELECT a, typeof(location(+a)) FROM t1 ORDER BY rowid LIMIT 2;
} {abc001 null abc002 null}
do_execsql_test func6-130 {
CREATE INDEX t1a ON t1(a);
SELECT a, typeof(location(a)) FROM t1 ORDER BY a LIMIT 2;
} {abc001 integer abc002 integer}
do_execsql_test func6-140 {
SELECT a, typeof(location(a)) FROM t1 NOT INDEXED ORDER BY a LIMIT 2;
} {abc001 integer abc002 integer}
finish_test
|