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When synthesizing an ON constraint from a USING or NATURAL, if the left-hand

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side is coming from a RIGHT JOIN, be sure to set the EP_CanBeNull flag so that
the optimizer knows to check for NULL even if the column has a NOT NULL
constraint.  Fix for the problem reported by
[forum:/forumpost/4fc70203b61c7e12|forum post 4fc70203b61]

FossilOrigin-Name: 60adc78a22956429d34ccc4e2c193c5994c11c3b3cff7901d47fad7d92dba935
This commit is contained in:
drh
2025-05-30 19:55:46 +00:00
parent f42ceb9075
commit dd16539e71
4 changed files with 40 additions and 10 deletions
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4
src/select.c
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@@ -596,7 +596,7 @@ static int sqlite3ProcessJoin(Parse *pParse, Select *p){
}
pE1 = sqlite3CreateColumnExpr(db, pSrc, iLeft, iLeftCol);
sqlite3SrcItemColumnUsed(&pSrc->a[iLeft], iLeftCol);
if( (pSrc->a[0].fg.jointype & JT_LTORJ)!=0 ){
if( (pSrc->a[0].fg.jointype & JT_LTORJ)!=0 && pParse->nErr==0 ){
/* This branch runs if the query contains one or more RIGHT or FULL
** JOINs. If only a single table on the left side of this join
** contains the zName column, then this branch is a no-op.
@@ -612,6 +612,8 @@ static int sqlite3ProcessJoin(Parse *pParse, Select *p){
*/
ExprList *pFuncArgs = 0; /* Arguments to the coalesce() */
static const Token tkCoalesce = { "coalesce", 8 };
assert( pE1!=0 );
ExprSetProperty(pE1, EP_CanBeNull);
while( tableAndColumnIndex(pSrc, iLeft+1, i, zName, &iLeft, &iLeftCol,
pRight->fg.isSynthUsing)!=0 ){
if( pSrc->a[iLeft].fg.isUsing==0