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Add an experimental location(X) SQL function that attempt to return the

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location of the payload within the database for the record that contains
column X.  location(X) returns NULL if X is not an ordinary table column or
if SQLite cannot figure out the location because it is using a covering index.

FossilOrigin-Name: 51be9558164301c5dd4df23ab8b3e67de0b522f8d36f79f3d84d45d3dc2a83a4
This commit is contained in:
drh
2017-12-16 20:20:37 +00:00
parent ebeffef36c
commit 2fc865c115
9 changed files with 102 additions and 17 deletions
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20
src/vdbe.c
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@@ -2349,6 +2349,26 @@ case OP_IfNullRow: { /* jump */
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
**