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/******************************************************
Purge obsolete records
(c) 1997 Innobase Oy
Created 3/14/1997 Heikki Tuuri
*******************************************************/
#ifndef row0purge_h
#define row0purge_h
#include "univ.i"
#include "data0data.h"
#include "btr0types.h"
#include "btr0pcur.h"
#include "dict0types.h"
#include "trx0types.h"
#include "que0types.h"
#include "row0types.h"
/************************************************************************
Creates a purge node to a query graph. */
purge_node_t*
row_purge_node_create(
/*==================*/
/* out, own: purge node */
que_thr_t* parent, /* in: parent node, i.e., a thr node */
mem_heap_t* heap); /* in: memory heap where created */
/***************************************************************
Does the purge operation for a single undo log record. This is a high-level
function used in an SQL execution graph. */
que_thr_t*
row_purge_step(
/*===========*/
/* out: query thread to run next or NULL */
que_thr_t* thr); /* in: query thread */
/* Purge node structure */
struct purge_node_struct{
que_common_t common; /* node type: QUE_NODE_PURGE */
/*----------------------*/
/* Local storage for this graph node */
dulint roll_ptr;/* roll pointer to undo log record */
trx_undo_rec_t* undo_rec;/* undo log record */
trx_undo_inf_t* reservation;/* reservation for the undo log record in
the purge array */
dulint undo_no;/* undo number of the record */
ulint rec_type;/* undo log record type: TRX_UNDO_INSERT_REC,
... */
btr_pcur_t pcur; /* persistent cursor used in searching the
clustered index record */
ibool found_clust;/* TRUE if the clustered index record
determined by ref was found in the clustered
index, and we were able to position pcur on
it */
dict_table_t* table; /* table where purge is done */
ulint cmpl_info;/* compiler analysis info of an update */
upd_t* update; /* update vector for a clustered index
record */
dtuple_t* ref; /* NULL, or row reference to the next row to
handle */
dtuple_t* row; /* NULL, or a copy (also fields copied to
heap) of the indexed fields of the row to
handle */
dict_index_t* index; /* NULL, or the next index whose record should
be handled */
mem_heap_t* heap; /* memory heap used as auxiliary storage for
row; this must be emptied after a successful
purge of a row */
};
#ifndef UNIV_NONINL
#include "row0purge.ic"
#endif
#endif
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