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Add a new hint bit on the flags parameter of sqlite3BtreeDelete(). The new

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BTREE_IDXDELETE bit indicates that the call is to delete an index entry 
corresponding to a table row that has already been deleted.

FossilOrigin-Name: ac2cbadd8000947c097da5b00c00090fe58fdcff
This commit is contained in:
drh
2016-01-21 17:06:33 +00:00
parent 9c0c57a4ca
commit e807bdba86
7 changed files with 73 additions and 33 deletions
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23
src/vdbe.c
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@@ -4341,14 +4341,20 @@ case OP_InsertInt: {
**
** Delete the record at which the P1 cursor is currently pointing.
**
** If the P5 parameter is non-zero, the cursor will be left pointing at
** either the next or the previous record in the table. If it is left
** pointing at the next record, then the next Next instruction will be a
** no-op. As a result, in this case it is OK to delete a record from within a
** Next loop. If P5 is zero, then the cursor is left in an undefined state.
** If the OPFLAG_SAVEPOSITION bit of the P5 parameter is set, then
** the cursor will be left pointing at either the next or the previous
** record in the table. If it is left pointing at the next record, then
** the next Next instruction will be a no-op. As a result, in this case
** it is ok to delete a record from within a Next loop. If
** OPFLAG_SAVEPOSITION bit of P5 is clear, then the cursor will be
** left in an undefined state.
**
** If the OPFLAG_NCHANGE flag of P2 is set, then the row change count is
** incremented (otherwise not).
** If the OPFLAG_IDXDELETE bit is set on P5, that indicates that this
** delete is on an index cursor where the corresponding table row has
** already been deleted.
**
** If the OPFLAG_NCHANGE flag of P2 (NB: P2 not P5) is set, then the row
** change count is incremented (otherwise not).
**
** P1 must not be pseudo-table. It has to be a real table with
** multiple rows.
@@ -4385,6 +4391,9 @@ case OP_Delete: {
}
#endif
assert( (pOp->p5 & ~(OPFLAG_SAVEPOSITION|OPFLAG_IDXDELETE))==0 );
assert( OPFLAG_SAVEPOSITION==BTREE_SAVEPOSITION );
assert( OPFLAG_IDXDELETE==BTREE_IDXDELETE );
rc = sqlite3BtreeDelete(pC->uc.pCursor, pOp->p5);
pC->cacheStatus = CACHE_STALE;