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When a table is part of a LEFT JOIN and should be a completely NULL row due to

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the semantics of a LEFT JOIN, make sure any generated columns on that row
evaluate to NULL.  Ticket [3b84b42943644d6f]

FossilOrigin-Name: 0271491438ad2a985aeff355173a8d0f1e5813954c82147bc68cb26cca5804c8
This commit is contained in:
drh
2019-12-16 16:52:22 +00:00
parent d35bdd6c09
commit 4dad7ed532
4 changed files with 43 additions and 10 deletions
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13
src/expr.c
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@@ -3408,11 +3408,20 @@ void sqlite3ExprCodeGeneratedColumn(
Column *pCol,
int regOut
){
int iAddr;
Vdbe *v = pParse->pVdbe;
assert( v!=0 );
assert( pParse->iSelfTab!=0 );
if( pParse->iSelfTab>0 ){
iAddr = sqlite3VdbeAddOp3(v, OP_IfNullRow, pParse->iSelfTab-1, 0, regOut);
}else{
iAddr = 0;
}
sqlite3ExprCode(pParse, pCol->pDflt, regOut);
if( pCol->affinity>=SQLITE_AFF_TEXT ){
sqlite3VdbeAddOp4(pParse->pVdbe, OP_Affinity, regOut, 1, 0,
&pCol->affinity, 1);
sqlite3VdbeAddOp4(v, OP_Affinity, regOut, 1, 0, &pCol->affinity, 1);
}
if( iAddr ) sqlite3VdbeJumpHere(v, iAddr);
}
#endif /* SQLITE_OMIT_GENERATED_COLUMNS */