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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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11
src/expr.c
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@@ -3889,6 +3889,17 @@ int sqlite3ExprCodeTarget(Parse *pParse, Expr *pExpr, int target){
break;
}
case TK_IF_NULL_ROW: {
int addrINR;
addrINR = sqlite3VdbeAddOp1(v, OP_IfNullRow, pExpr->iTable);
sqlite3ExprCachePush(pParse);
inReg = sqlite3ExprCodeTarget(pParse, pExpr->pLeft, target);
sqlite3ExprCachePop(pParse);
sqlite3VdbeJumpHere(v, addrINR);
sqlite3VdbeChangeP3(v, addrINR, inReg);
break;
}
/*
** Form A:
** CASE x WHEN e1 THEN r1 WHEN e2 THEN r2 ... WHEN eN THEN rN ELSE y END