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Preliminary code to support RIGHT JOIN. Everything seems to work, except that

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the code to compute the unmatched rows for the RIGHT JOIN has not yet been
added, so the result of a RIGHT JOIN is currently the same as an INNER JOIN.

FossilOrigin-Name: 415abd6731b8e8a605adabfa6066c8a852a8531c300df41325d5f7e75cae5a70
This commit is contained in:
drh
2022-04-08 19:20:12 +00:00
parent 7d0ae00361
commit a76ac88af8
12 changed files with 103 additions and 90 deletions
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14
src/build.c
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@@ -5071,10 +5071,22 @@ void sqlite3SrcListFuncArgs(Parse *pParse, SrcList *p, ExprList *pList){
void sqlite3SrcListShiftJoinType(SrcList *p){
if( p ){
int i;
u8 allFlags = 0;
for(i=p->nSrc-1; i>0; i--){
p->a[i].fg.jointype = p->a[i-1].fg.jointype;
allFlags |= p->a[i].fg.jointype = p->a[i-1].fg.jointype;
}
p->a[0].fg.jointype = 0;
/* All terms to the left of a RIGHT JOIN should be tagged with the
** JT_LTORJ flags */
if( allFlags & JT_RIGHT ){
for(i=p->nSrc-1; ALWAYS(i>0) && (p->a[i].fg.jointype&JT_RIGHT)==0; i--){}
i--;
assert( i>=0 );
do{
p->a[i--].fg.jointype |= JT_LTORJ;
}while( i>=0 );
}
}
}