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Tweaks to the generated VDBE code to make it a little easier to follow.

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FossilOrigin-Name: 129217ee91782ec77ff82661753ae5bee8ca99d0
This commit is contained in:
drh
2014-02-08 13:12:19 +00:00
parent e0e261a473
commit 725de29a2d
4 changed files with 16 additions and 14 deletions
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12
src/select.c
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@@ -4537,12 +4537,12 @@ int sqlite3Select(
/* Implement a co-routine that will return a single row of the result
** set on each invocation.
*/
int addrTop;
int addrTop = sqlite3VdbeCurrentAddr(v)+1;
pItem->regReturn = ++pParse->nMem;
sqlite3VdbeAddOp0(v, OP_Goto);
addrTop = sqlite3VdbeAddOp1(v, OP_OpenPseudo, pItem->iCursor);
sqlite3VdbeAddOp3(v, OP_InitCoroutine, pItem->regReturn, 0, addrTop);
VdbeComment((v, "%s", pItem->pTab->zName));
sqlite3VdbeAddOp1(v, OP_OpenPseudo, pItem->iCursor);
sqlite3VdbeChangeP5(v, 1);
VdbeComment((v, "coroutine %s", pItem->pTab->zName));
pItem->addrFillSub = addrTop;
sqlite3SelectDestInit(&dest, SRT_Coroutine, pItem->regReturn);
explainSetInteger(pItem->iSelectId, (u8)pParse->iNextSelectId);
@@ -4567,12 +4567,14 @@ int sqlite3Select(
pItem->regReturn = ++pParse->nMem;
topAddr = sqlite3VdbeAddOp2(v, OP_Integer, 0, pItem->regReturn);
pItem->addrFillSub = topAddr+1;
VdbeNoopComment((v, "materialize %s", pItem->pTab->zName));
if( pItem->isCorrelated==0 ){
/* If the subquery is not correlated and if we are not inside of
** a trigger, then we only need to compute the value of the subquery
** once. */
onceAddr = sqlite3CodeOnce(pParse);
VdbeComment((v, "materialize \"%s\"", pItem->pTab->zName));
}else{
VdbeNoopComment((v, "materialize \"%s\"", pItem->pTab->zName));
}
sqlite3SelectDestInit(&dest, SRT_EphemTab, pItem->iCursor);
explainSetInteger(pItem->iSelectId, (u8)pParse->iNextSelectId);