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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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6
src/wherecode.c
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@@ -2604,7 +2604,9 @@ Bitmask sqlite3WhereCodeOneLoopStart(
}
pE = pTerm->pExpr;
assert( pE!=0 );
if( (pTabItem->fg.jointype&JT_LEFT) && !ExprHasProperty(pE,EP_FromJoin) ){
if( (pTabItem->fg.jointype & (JT_LEFT|JT_LTORJ))
&& !ExprHasProperty(pE,EP_FromJoin)
){
continue;
}
@@ -2666,7 +2668,7 @@ Bitmask sqlite3WhereCodeOneLoopStart(
if( (pTerm->eOperator & (WO_EQ|WO_IS))==0 ) continue;
if( (pTerm->eOperator & WO_EQUIV)==0 ) continue;
if( pTerm->leftCursor!=iCur ) continue;
if( pTabItem->fg.jointype & JT_LEFT ) continue;
if( pTabItem->fg.jointype & (JT_LEFT|JT_LTORJ) ) continue;
pE = pTerm->pExpr;
#ifdef WHERETRACE_ENABLED /* 0x800 */
if( sqlite3WhereTrace & 0x800 ){