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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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10
src/select.c
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@@ -301,10 +301,6 @@ int sqlite3JoinType(Parse *pParse, Token *pA, Token *pB, Token *pC){
sqlite3ErrorMsg(pParse, "unknown or unsupported join type: "
"%T%s%T%s%T", pA, zSp1, pB, zSp2, pC);
jointype = JT_INNER;
}else if( (jointype & JT_RIGHT)!=0 ){
sqlite3ErrorMsg(pParse,
"RIGHT and FULL OUTER JOINs are not currently supported");
jointype = JT_INNER;
}
return jointype;
}
@@ -6589,7 +6585,7 @@ int sqlite3Select(
&& i==0
&& (p->selFlags & SF_ComplexResult)!=0
&& (pTabList->nSrc==1
|| (pTabList->a[1].fg.jointype&(JT_LEFT|JT_CROSS))!=0)
|| (pTabList->a[1].fg.jointype&(JT_OUTER|JT_CROSS))!=0)
){
continue;
}
@@ -6741,8 +6737,8 @@ int sqlite3Select(
*/
if( i==0
&& (pTabList->nSrc==1
|| (pTabList->a[1].fg.jointype&(JT_LEFT|JT_CROSS))!=0) /* (1) */
&& (pItem->fg.isCte==0 || pItem->u2.pCteUse->eM10d!=M10d_Yes) /* (2) */
|| (pTabList->a[1].fg.jointype&(JT_OUTER|JT_CROSS))!=0) /* (1) */
&& (pItem->fg.isCte==0 || pItem->u2.pCteUse->eM10d!=M10d_Yes) /* (2) */
){
/* Implement a co-routine that will return a single row of the result
** set on each invocation.