diff options
Diffstat (limited to 'src/backend/commands/sequence.c')
| -rw-r--r-- | src/backend/commands/sequence.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c index b73069cf1b6..9404efa379f 100644 --- a/src/backend/commands/sequence.c +++ b/src/backend/commands/sequence.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/commands/sequence.c,v 1.141 2006/10/06 17:13:58 petere Exp $ + * $PostgreSQL: pgsql/src/backend/commands/sequence.c,v 1.141.2.1 2007/10/25 19:15:01 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -315,6 +315,7 @@ AlterSequence(AlterSeqStmt *stmt) Form_pg_sequence seq; FormData_pg_sequence new; List *owned_by; + int64 save_increment; /* open and AccessShareLock sequence */ relid = RangeVarGetRelid(stmt->sequence, false); @@ -325,6 +326,9 @@ AlterSequence(AlterSeqStmt *stmt) aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CLASS, stmt->sequence->relname); + /* hack to keep ALTER SEQUENCE OWNED BY from changing currval state */ + save_increment = elm->increment; + /* lock page' buffer and read tuple into new sequence structure */ seq = read_info(elm, seqrel, &buf); page = BufferGetPage(buf); @@ -338,10 +342,18 @@ AlterSequence(AlterSeqStmt *stmt) /* Now okay to update the on-disk tuple */ memcpy(seq, &new, sizeof(FormData_pg_sequence)); - /* Clear local cache so that we don't think we have cached numbers */ - elm->last = new.last_value; /* last returned number */ - elm->cached = new.last_value; /* last cached number (forget cached + if (owned_by) + { + /* Restore previous state of elm (assume nothing else changes) */ + elm->increment = save_increment; + } + else + { + /* Clear local cache so that we don't think we have cached numbers */ + elm->last = new.last_value; /* last returned number */ + elm->cached = new.last_value; /* last cached number (forget cached * values) */ + } START_CRIT_SECTION(); |