diff options
| -rw-r--r-- | src/include/nodes/pg_list.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/src/include/nodes/pg_list.h b/src/include/nodes/pg_list.h index dc991626ba0..57eb8458dcf 100644 --- a/src/include/nodes/pg_list.h +++ b/src/include/nodes/pg_list.h @@ -15,16 +15,18 @@ * Non-empty lists have a header, which will not be relocated as long as the * list remains non-empty, and an expansible data array. * - * We support three types of lists: + * We support four types of lists: * * T_List: lists of pointers * (in practice usually pointers to Nodes, but not always; * declared as "void *" to minimize casting annoyances) * T_IntList: lists of integers * T_OidList: lists of Oids + * T_XidList: lists of TransactionIds + * (the XidList infrastructure is less complete than the other cases) * - * (At the moment, ints and Oids are the same size, but they may not - * always be so; try to be careful to maintain the distinction.) + * (At the moment, ints, Oids, and XIDs are the same size, but they may not + * always be so; be careful to use the appropriate list type for your data.) * * * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group @@ -50,7 +52,7 @@ typedef union ListCell typedef struct List { - NodeTag type; /* T_List, T_IntList, or T_OidList */ + NodeTag type; /* T_List, T_IntList, T_OidList, or T_XidList */ int length; /* number of elements currently present */ int max_length; /* allocated length of elements[] */ ListCell *elements; /* re-allocatable array of cells */ |