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A few bits and bobs of code generation toward getting RIGHT JOIN to work.

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Much more remains to do.

FossilOrigin-Name: 55b4543122646997d928598343bc467c993f971e86e9037c85430cc948750576
This commit is contained in:
drh
2022-04-09 03:16:26 +00:00
parent c187163090
commit c2308ad2a0
5 changed files with 61 additions and 11 deletions
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35
src/wherecode.c
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@@ -2721,6 +2721,41 @@ Bitmask sqlite3WhereCodeOneLoopStart(
}
}
/* For a RIGHT OUTER JOIN, record the fact that the current row has
** been matched at least once.
*/
if( pLevel->iRJMatch ){
Table *pTab;
int nPk;
int r;
int jmp1 = 0;
pTab = pWInfo->pTabList->a[pLevel->iFrom].pTab;
if( HasRowid(pTab) ){
r = sqlite3GetTempRange(pParse, 2);
sqlite3ExprCodeGetColumnOfTable(v, pTab, pLevel->iTabCur, -1, r+1);
nPk = 1;
}else{
int iPk;
Index *pPk = sqlite3PrimaryKeyIndex(pTab);
nPk = pPk->nKeyCol;
r = sqlite3GetTempRange(pParse, nPk+1);
for(iPk=0; iPk<nPk; iPk++){
int iCol = pPk->aiColumn[iPk];
sqlite3ExprCodeGetColumnOfTable(v, pTab, iCur, iCol,r+1+iPk);
}
}
jmp1 = sqlite3VdbeAddOp4Int(v, OP_Found, pLevel->iRJMatch, 0, r+1, nPk);
VdbeCoverage(v);
sqlite3VdbeAddOp3(v, OP_MakeRecord, r+1, nPk, r);
sqlite3VdbeAddOp4Int(v, OP_IdxInsert, pLevel->iRJMatch, r, r+1, nPk);
sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
sqlite3VdbeJumpHere(v, jmp1);
/* Release the array of temp registers */
sqlite3ReleaseTempRange(pParse, r, nPk+1);
}
#if WHERETRACE_ENABLED /* 0x20800 */
if( sqlite3WhereTrace & 0x20000 ){
sqlite3DebugPrintf("All WHERE-clause terms after coding level %d:\n",