diff options
Diffstat (limited to 'src/backend/access/common/tupdesc.c')
| -rw-r--r-- | src/backend/access/common/tupdesc.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/backend/access/common/tupdesc.c b/src/backend/access/common/tupdesc.c index 253d6c86f86..ce2c7bce856 100644 --- a/src/backend/access/common/tupdesc.c +++ b/src/backend/access/common/tupdesc.c @@ -927,3 +927,28 @@ BuildDescFromLists(const List *names, const List *types, const List *typmods, co return desc; } + +/* + * Get default expression (or NULL if none) for the given attribute number. + */ +Node * +TupleDescGetDefault(TupleDesc tupdesc, AttrNumber attnum) +{ + Node *result = NULL; + + if (tupdesc->constr) + { + AttrDefault *attrdef = tupdesc->constr->defval; + + for (int i = 0; i < tupdesc->constr->num_defval; i++) + { + if (attrdef[i].adnum == attnum) + { + result = stringToNode(attrdef[i].adbin); + break; + } + } + } + + return result; +} |