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The OP_SeekScan opcode is a no-op if the cursor is not pointing to a valid

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row upon entry.

FossilOrigin-Name: 4afc96b5fe80bd192a23e0230edc207e641931c3bf48296b1a385c786386f1b7
This commit is contained in:
drh
2020-09-29 23:52:25 +00:00
parent 0b2949c36e
commit a54e1b1fc8
3 changed files with 11 additions and 13 deletions
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10
src/vdbe.c
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@@ -4407,10 +4407,8 @@ seek_not_found:
** is the desired entry that we want the cursor SeekGE.P1 to be pointing
** to. Call this SeekGE.P4/P5 row the "target".
**
** If the OP_SeekGE opcode that immediately follows this opcode has
** never run before, which is to say if the SeekGE.P1 cursor is not pointing
** to a valid raow, then this opcode is a no-op and control passes
** through into the OP_SeekGE.
** If the SeekGE.P1 cursor is not currently pointing to a valid row,
** then this opcode is a no-op and control passes through into the OP_SeekGE.
**
** If the SeekGE.P1 cursor is pointing to a valid row, then that row
** might be the target row, or it might be near and slightly before the
@@ -4449,10 +4447,10 @@ case OP_SeekScan: {
assert( pC!=0 );
assert( pC->eCurType==CURTYPE_BTREE );
assert( !pC->isTable );
if( pC->nullRow ){
if( !sqlite3BtreeCursorIsValidNN(pC->uc.pCursor) ){
#ifdef SQLITE_DEBUG
if( db->flags&SQLITE_VdbeTrace ){
printf("... no prior seeks - fall through\n");
printf("... cursor not valid - fall through\n");
}
#endif
break;