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Allow flattening of a subquery that is the right operand of a LEFT JOIN

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in an aggregate query as long as there is no GROUP BY clause.  (The GROUP BY
clause will interfere with the operation of the TK_IF_NULL_ROW expression
nodes.)

FossilOrigin-Name: 2cf373b10c9bc4cbc5fe63d0a6948011df7bbc2f40dc025c9349f875da782b88
This commit is contained in:
drh
2022-06-25 19:43:44 +00:00
parent 62f1b48638 521e0b6cb6
commit fe9833482f
5 changed files with 48 additions and 18 deletions
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7
src/vdbe.c
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@@ -2639,11 +2639,14 @@ case OP_NotNull: { /* same as TK_NOTNULL, jump, in1 */
** 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.
**
** If P1 is not an open cursor, then this opcode is a no-op.
*/
case OP_IfNullRow: { /* jump */
VdbeCursor *pC;
assert( pOp->p1>=0 && pOp->p1<p->nCursor );
assert( p->apCsr[pOp->p1]!=0 );
if( p->apCsr[pOp->p1]->nullRow ){
pC = p->apCsr[pOp->p1];
if( pC && pC->nullRow ){
sqlite3VdbeMemSetNull(aMem + pOp->p3);
goto jump_to_p2;
}