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Document the use of OPFLAG_ISNOOP as the P2 argument on OP_Delete. No

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functional code changes.

FossilOrigin-Name: d88f41b2cf2b721170d2428a50b717976091389d9a07d0ffa15c3323b0eaad37
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drh 2023-09-14 16:02:56 +00:00
parent 82cdf4987d
commit e68decd54c
3 changed files with 15 additions and 10 deletions
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D 2023-09-14T14:05:51.500
C Document\sthe\suse\sof\sOPFLAG_ISNOOP\sas\sthe\sP2\sargument\son\sOP_Delete.\s\sNo\nfunctional\scode\schanges.
D 2023-09-14T16:02:56.452
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@ -5775,8 +5775,13 @@ case OP_RowCell: {
** the "primary" delete. The others are all on OPFLAG_FORDELETE
** cursors or else are marked with the AUXDELETE flag.
**
** If the OPFLAG_NCHANGE flag of P2 (NB: P2 not P5) is set, then the row
** change count is incremented (otherwise not).
** If the OPFLAG_NCHANGE (0x01) flag of P2 (NB: P2 not P5) is set, then
** the row change count is incremented (otherwise not).
**
** If the OPFLAG_ISNOOP (0x40) flag of P2 (not P5!) is set, then the
** pre-update-hook for deletes is run, but the btree is otherwise unchanged.
** This happens when the OP_Delete is to be shortly followed by an OP_Insert
** with the same key, causing the btree entry to be overwritten.
**
** P1 must not be pseudo-table. It has to be a real table with
** multiple rows.