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Add a RESTART (without parameter) option to ALTER SEQUENCE, allowing a

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sequence to be reset to its original starting value.  This requires adding the
original start value to the set of parameters (columns) of a sequence object,
which is a user-visible change with potential compatibility implications;
it also forces initdb.

Also add hopefully-SQL-compatible RESTART/CONTINUE IDENTITY options to
TRUNCATE TABLE.  RESTART IDENTITY executes ALTER SEQUENCE RESTART for all
sequences "owned by" any of the truncated relations.  CONTINUE IDENTITY is
a no-op option.

Zoltan Boszormenyi
This commit is contained in:
Tom Lane
2008-05-16 23:36:05 +00:00
parent 8a2f5d221b
commit 10a3471bed
18 changed files with 513 additions and 106 deletions
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31
src/include/commands/sequence.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/sequence.h,v 1.40 2008/03/27 03:57:34 tgl Exp $
* $PostgreSQL: pgsql/src/include/commands/sequence.h,v 1.41 2008/05/16 23:36:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -30,6 +30,7 @@ typedef struct FormData_pg_sequence
NameData sequence_name;
#ifndef INT64_IS_BUSTED
int64 last_value;
int64 start_value;
int64 increment_by;
int64 max_value;
int64 min_value;
@@ -38,16 +39,18 @@ typedef struct FormData_pg_sequence
#else
int32 last_value;
int32 pad1;
int32 increment_by;
int32 start_value;
int32 pad2;
int32 max_value;
int32 increment_by;
int32 pad3;
int32 min_value;
int32 max_value;
int32 pad4;
int32 cache_value;
int32 min_value;
int32 pad5;
int32 log_cnt;
int32 cache_value;
int32 pad6;
int32 log_cnt;
int32 pad7;
#endif
bool is_cycled;
bool is_called;
@@ -61,13 +64,14 @@ typedef FormData_pg_sequence *Form_pg_sequence;
#define SEQ_COL_NAME 1
#define SEQ_COL_LASTVAL 2
#define SEQ_COL_INCBY 3
#define SEQ_COL_MAXVALUE 4
#define SEQ_COL_MINVALUE 5
#define SEQ_COL_CACHE 6
#define SEQ_COL_LOG 7
#define SEQ_COL_CYCLE 8
#define SEQ_COL_CALLED 9
#define SEQ_COL_STARTVAL 3
#define SEQ_COL_INCBY 4
#define SEQ_COL_MAXVALUE 5
#define SEQ_COL_MINVALUE 6
#define SEQ_COL_CACHE 7
#define SEQ_COL_LOG 8
#define SEQ_COL_CYCLE 9
#define SEQ_COL_CALLED 10
#define SEQ_COL_FIRSTCOL SEQ_COL_NAME
#define SEQ_COL_LASTCOL SEQ_COL_CALLED
@@ -90,6 +94,7 @@ extern Datum lastval(PG_FUNCTION_ARGS);
extern void DefineSequence(CreateSeqStmt *stmt);
extern void AlterSequence(AlterSeqStmt *stmt);
extern void AlterSequenceInternal(Oid relid, List *options);
extern void seq_redo(XLogRecPtr lsn, XLogRecord *rptr);
extern void seq_desc(StringInfo buf, uint8 xl_info, char *rec);