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Improved comments on the FORDELETE hint. No logic changes.

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FossilOrigin-Name: a3cec529f0238e4ca1196fec420f2de80d28db78
This commit is contained in:
drh
2016-01-21 15:55:37 +00:00
parent b5a5a23e92
commit 9c0c57a4ca
5 changed files with 29 additions and 20 deletions
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11
src/where.c
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@@ -4014,7 +4014,7 @@ WhereInfo *sqlite3WhereBegin(
int ii; /* Loop counter */
sqlite3 *db; /* Database connection */
int rc; /* Return code */
u8 bFordelete = 0;
u8 bFordelete = 0; /* OPFLAG_FORDELETE or zero, as appropriate */
assert( (wctrlFlags & WHERE_ONEPASS_MULTIROW)==0 || (
(wctrlFlags & WHERE_ONEPASS_DESIRED)!=0
@@ -4259,16 +4259,15 @@ WhereInfo *sqlite3WhereBegin(
/* If the caller is an UPDATE or DELETE statement that is requesting
** to use a one-pass algorithm, determine if this is appropriate.
** The one-pass algorithm only works if the WHERE clause constrains
** the statement to update or delete a single row.
*/
assert( (wctrlFlags & WHERE_ONEPASS_DESIRED)==0 || pWInfo->nLevel==1 );
if( (wctrlFlags & WHERE_ONEPASS_DESIRED)!=0 ){
int wsFlags = pWInfo->a[0].pWLoop->wsFlags;
int bOnerow = (wsFlags & WHERE_ONEROW)!=0;
if( bOnerow || ( (wctrlFlags & WHERE_ONEPASS_MULTIROW)
&& 0==(wsFlags & WHERE_VIRTUALTABLE)
)){
if( bOnerow
|| ((wctrlFlags & WHERE_ONEPASS_MULTIROW)!=0
&& 0==(wsFlags & WHERE_VIRTUALTABLE))
){
pWInfo->eOnePass = bOnerow ? ONEPASS_SINGLE : ONEPASS_MULTI;
if( HasRowid(pTabList->a[0].pTab) && (wsFlags & WHERE_IDX_ONLY) ){
if( wctrlFlags & WHERE_ONEPASS_MULTIROW ){