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Provide the BTREE_FORDELETE flag to sqlite3BtreeCursor() if the cursor will

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be used only for deletions and seeking.

FossilOrigin-Name: 871b1c78bcbea1cb03d482f2f424c4e012633695
This commit is contained in:
drh
2015-10-26 17:50:54 +00:00
parent 4dd83a22f2 2b4e95226c
commit 3d541a5b8c
13 changed files with 143 additions and 33 deletions
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9
src/where.c
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@@ -4010,6 +4010,7 @@ WhereInfo *sqlite3WhereBegin(
int ii; /* Loop counter */
sqlite3 *db; /* Database connection */
int rc; /* Return code */
u8 bFordelete = 0;
assert( (wctrlFlags & WHERE_ONEPASS_MULTIROW)==0 || (
(wctrlFlags & WHERE_ONEPASS_DESIRED)!=0
@@ -4265,8 +4266,11 @@ WhereInfo *sqlite3WhereBegin(
&& 0==(wsFlags & WHERE_VIRTUALTABLE)
)){
pWInfo->eOnePass = bOnerow ? ONEPASS_SINGLE : ONEPASS_MULTI;
if( HasRowid(pTabList->a[0].pTab) ){
pWInfo->a[0].pWLoop->wsFlags &= ~WHERE_IDX_ONLY;
if( HasRowid(pTabList->a[0].pTab) && (wsFlags & WHERE_IDX_ONLY) ){
if( wctrlFlags & WHERE_ONEPASS_MULTIROW ){
bFordelete = OPFLAG_FORDELETE;
}
pWInfo->a[0].pWLoop->wsFlags = (wsFlags & ~WHERE_IDX_ONLY);
}
}
}
@@ -4303,6 +4307,7 @@ WhereInfo *sqlite3WhereBegin(
pWInfo->aiCurOnePass[0] = pTabItem->iCursor;
};
sqlite3OpenTable(pParse, pTabItem->iCursor, iDb, pTab, op);
sqlite3VdbeChangeP5(v, bFordelete);
assert( pTabItem->iCursor==pLevel->iTabCur );
testcase( pWInfo->eOnePass==ONEPASS_OFF && pTab->nCol==BMS-1 );
testcase( pWInfo->eOnePass==ONEPASS_OFF && pTab->nCol==BMS );