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Add the TK_IF_NULL_ROW opcode to deal with non-NULL result columns in the

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result set of a view or subquery on the RHS of a LEFT JOIN that gets flattened.

FossilOrigin-Name: 3a5860d86fadcf924316707918bf283d26c53b1473e5e67f5cff59d18c2a7742
This commit is contained in:
drh
2017-04-14 19:03:10 +00:00
parent 399c7e21e4
commit 31d6fd5507
9 changed files with 83 additions and 47 deletions
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17
src/vdbe.c
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@@ -2429,6 +2429,23 @@ case OP_NotNull: { /* same as TK_NOTNULL, jump, in1 */
break;
}
/* Opcode: IfNullRow P1 P2 P3 * *
** Synopsis: if P1.nullRow then r[P3]=NULL, goto P2
**
** Check the cursor P1 to see if it is currently pointing at a NULL row.
** If it is, then set register P3 to NULL and jump immediately to P2.
** If P1 is not on a NULL row, then fall through without making any
** changes.
*/
case OP_IfNullRow: { /* jump */
assert( pOp->p1>=0 && pOp->p1<p->nCursor );
if( p->apCsr[pOp->p1]->nullRow ){
sqlite3VdbeMemSetNull(aMem + pOp->p3);
goto jump_to_p2;
}
break;
}
/* Opcode: Column P1 P2 P3 P4 P5
** Synopsis: r[P3]=PX
**