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Enhance location(X) so that it works with indexes and WITHOUT ROWID tables.

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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.

FossilOrigin-Name: dd94d6a880dfec4bddd247239b815b84964f804d24841e25f33f1d46a4b5274d
This commit is contained in:
drh
2017-12-29 14:33:54 +00:00
parent 7a8573bafa
commit fe6d20e9f4
7 changed files with 27 additions and 23 deletions
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19
src/vdbe.c
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@@ -2349,22 +2349,27 @@ case OP_IfNullRow: { /* jump */
break;
}
/* Opcode: Location P1 P2 * * *
** Synopsis: r[P2] = location(P1)
/* Opcode: Location P1 P2 P3 * *
** Synopsis: r[P3] = location(P1)
**
** Store in register r[P2] the location in the database file that is the
** 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: { /* out2 */
case OP_Location: { /* out3 */
VdbeCursor *pC; /* The VDBE cursor */
assert( pOp->p1>=0 && pOp->p1<p->nCursor );
pC = p->apCsr[pOp->p1];
pOut = out2Prerelease(p, pOp);
pOut = &p->aMem[pOp->p3];
if( pC==0 || pC->eCurType!=CURTYPE_BTREE ){
pOut->flags = MEM_Null;
sqlite3VdbeMemSetNull(pOut);
}else{
pOut->u.i = sqlite3BtreeLocation(pC->uc.pCursor);
sqlite3VdbeMemSetInt64(pOut, sqlite3BtreeLocation(pC->uc.pCursor));
}
break;
}