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The interior of the RIGHT JOIN loop is now a subroutine.

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FossilOrigin-Name: 549f5a7ee639de80f049445002f58e93c805f9a3d3db1987ec9d139ccef4805e
This commit is contained in:
drh
2022-04-09 12:27:20 +00:00
parent c2308ad2a0
commit 7c1734b09e
5 changed files with 55 additions and 19 deletions
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24
src/wherecode.c
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@@ -2724,12 +2724,18 @@ Bitmask sqlite3WhereCodeOneLoopStart(
/* For a RIGHT OUTER JOIN, record the fact that the current row has
** been matched at least once.
*/
if( pLevel->iRJMatch ){
if( pLevel->pRJ ){
Table *pTab;
int nPk;
int r;
int jmp1 = 0;
WhereRightJoin *pRJ = pLevel->pRJ;
/* pTab is the right-hand table of the RIGHT JOIN. Generate code that
** will record that the current row of that table has been matched at
** least once. This is accomplished by storing the PK for the row in
** both the iMatch index and the regBloom Bloom filter.
*/
pTab = pWInfo->pTabList->a[pLevel->iFrom].pTab;
if( HasRowid(pTab) ){
r = sqlite3GetTempRange(pParse, 2);
@@ -2745,15 +2751,23 @@ Bitmask sqlite3WhereCodeOneLoopStart(
sqlite3ExprCodeGetColumnOfTable(v, pTab, iCur, iCol,r+1+iPk);
}
}
jmp1 = sqlite3VdbeAddOp4Int(v, OP_Found, pLevel->iRJMatch, 0, r+1, nPk);
jmp1 = sqlite3VdbeAddOp4Int(v, OP_Found, pRJ->iMatch, 0, r+1, nPk);
VdbeCoverage(v);
sqlite3VdbeAddOp3(v, OP_MakeRecord, r+1, nPk, r);
sqlite3VdbeAddOp4Int(v, OP_IdxInsert, pLevel->iRJMatch, r, r+1, nPk);
sqlite3VdbeAddOp4Int(v, OP_IdxInsert, pRJ->iMatch, r, r+1, nPk);
sqlite3VdbeAddOp4Int(v, OP_FilterAdd, pRJ->regBloom, 0, r+1, nPk);
sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
sqlite3VdbeJumpHere(v, jmp1);
/* Release the array of temp registers */
sqlite3ReleaseTempRange(pParse, r, nPk+1);
/* Create a subroutine used to process all interior loops and code
** of the RIGHT JOIN. During normal operation, the subroutine will
** be in-line with the rest of the code. But at the end, a separate
** loop will run that invokes this subroutine for unmatched rows
** of pTab, with all tables to left begin set to NULL.
*/
sqlite3VdbeAddOp2(v, OP_BeginSubrtn, 0, pRJ->regReturn);
pRJ->addrSubrtn = sqlite3VdbeCurrentAddr(v);
}
#if WHERETRACE_ENABLED /* 0x20800 */