greenplumn sequence 源码
greenplumn sequence 代码
文件路径：/src/include/commands/sequence.h
/*-------------------------------------------------------------------------
*
* sequence.h
* prototypes for sequence.c.
*
* Portions Copyright (c) 2006-2008, Greenplum inc.
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/commands/sequence.h
*
*-------------------------------------------------------------------------
*/
#ifndef SEQUENCE_H
#define SEQUENCE_H
#include "access/xlogreader.h"
#include "catalog/objectaddress.h"
#include "fmgr.h"
#include "lib/stringinfo.h"
#include "nodes/parsenodes.h"
#include "parser/parse_node.h"
#include "storage/relfilenode.h"
typedef struct FormData_pg_sequence_data
{
int64 last_value;
int64 log_cnt;
bool is_called;
} FormData_pg_sequence_data;
typedef FormData_pg_sequence_data *Form_pg_sequence_data;
/*
* Columns of a sequence relation
*/
#define SEQ_COL_LASTVAL 1
#define SEQ_COL_LOG 2
#define SEQ_COL_CALLED 3
#define SEQ_COL_FIRSTCOL SEQ_COL_LASTVAL
#define SEQ_COL_LASTCOL SEQ_COL_CALLED
/* XLOG stuff */
#define XLOG_SEQ_LOG 0x00
#define SEQ_NEXTVAL_FALSE 'f'
#define SEQ_NEXTVAL_TRUE 't'
#define SEQ_NEXTVAL_QUERY_RESPONSE '?'
typedef struct xl_seq_rec
{
RelFileNode node;
/* SEQUENCE TUPLE DATA FOLLOWS AT THE END */
} xl_seq_rec;
extern int64 nextval_internal(Oid relid, bool check_permissions, bool called_from_dispatcher);
extern Datum nextval(PG_FUNCTION_ARGS);
extern void nextval_qd(Oid relid, int64 *plast, int64 *pcached, int64 *pincrement, bool *poverflow);
extern List *sequence_options(Oid relid);
extern ObjectAddress DefineSequence(ParseState *pstate, CreateSeqStmt *stmt);
extern ObjectAddress AlterSequence(ParseState *pstate, AlterSeqStmt *stmt);
extern void DeleteSequenceTuple(Oid relid);
extern void ResetSequence(Oid seq_relid);
extern void ResetSequenceCaches(void);
extern void seq_redo(XLogReaderState *rptr);
extern void seq_desc(StringInfo buf, XLogReaderState *rptr);
extern const char *seq_identify(uint8 info);
extern void seq_mask(char *pagedata, BlockNumber blkno);
#endif /* SEQUENCE_H */
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