diff options
Diffstat (limited to 'src/include/nodes/execnodes.h')
| -rw-r--r-- | src/include/nodes/execnodes.h | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index 56bac9350f5..726ee5bdae6 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.171 2007/03/27 23:21:12 tgl Exp $ + * $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.172 2007/04/26 23:24:44 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -408,8 +408,20 @@ typedef struct TupleHashTableData typedef HASH_SEQ_STATUS TupleHashIterator; -#define ResetTupleHashIterator(htable, iter) \ +/* + * Use InitTupleHashIterator/TermTupleHashIterator for a read/write scan. + * Use ResetTupleHashIterator if the table can be frozen (in this case no + * explicit scan termination is needed). + */ +#define InitTupleHashIterator(htable, iter) \ hash_seq_init(iter, (htable)->hashtab) +#define TermTupleHashIterator(iter) \ + hash_seq_term(iter) +#define ResetTupleHashIterator(htable, iter) \ + do { \ + hash_freeze((htable)->hashtab); \ + hash_seq_init(iter, (htable)->hashtab); \ + } while (0) #define ScanTupleHashTable(iter) \ ((TupleHashEntry) hash_seq_search(iter)) |