diff options
Diffstat (limited to 'src/backend/nodes/list.c')
| -rw-r--r-- | src/backend/nodes/list.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/src/backend/nodes/list.c b/src/backend/nodes/list.c index e896b479018..bf9e5c10d6f 100644 --- a/src/backend/nodes/list.c +++ b/src/backend/nodes/list.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/nodes/list.c,v 1.44 2003/01/20 18:54:47 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/nodes/list.c,v 1.45 2003/01/24 03:58:34 tgl Exp $ * * NOTES * XXX a few of the following functions are duplicated to handle @@ -357,6 +357,7 @@ set_union(List *l1, List *l2) return retval; } +/* set_union for integer lists */ List * set_unioni(List *l1, List *l2) { @@ -371,6 +372,21 @@ set_unioni(List *l1, List *l2) return retval; } +/* set_union when pointer-equality comparison is sufficient */ +List * +set_ptrUnion(List *l1, List *l2) +{ + List *retval = listCopy(l1); + List *i; + + foreach(i, l2) + { + if (!ptrMember(lfirst(i), retval)) + retval = lappend(retval, lfirst(i)); + } + return retval; +} + /* * Generate the intersection of two lists, * ie, all members of both l1 and l2. |