Function transformOfType

src/backend/parser/parse_utilcmd.c:1632–1675

}

static void
transformOfType(CreateStmtContext *cxt, TypeName *ofTypename)
{
	HeapTuple	tuple;
	TupleDesc	tupdesc;
	int			i;
	Oid			ofTypeId;

	AssertArg(ofTypename);

	tuple = typenameType(NULL, ofTypename, NULL);
	check_of_type(tuple);
	ofTypeId = ((Form_pg_type) GETSTRUCT(tuple))->oid;
	ofTypename->typeOid = ofTypeId; /* cached for later */

	tupdesc = lookup_rowtype_tupdesc(ofTypeId, -1);
	for (i = 0; i < tupdesc->natts; i++)
	{
		Form_pg_attribute attr = TupleDescAttr(tupdesc, i);
		ColumnDef  *n;

		if (attr->attisdropped)
			continue;

		n = makeNode(ColumnDef);
		n->colname = pstrdup(NameStr(attr->attname));
		n->typeName = makeTypeNameFromOid(attr->atttypid, attr->atttypmod);
		n->inhcount = 0;
		n->is_local = true;
		n->is_not_null = false;
		n->is_from_type = true;
		n->storage = 0;
		n->raw_default = NULL;
		n->cooked_default = NULL;
		n->collClause = NULL;
		n->collOid = attr->attcollation;
		n->constraints = NIL;
		n->location = -1;
		cxt->columns = lappend(cxt->columns, n);
	}
	DecrTupleDescRefCount(tupdesc);

	ReleaseSysCache(tuple);
}

/*
 * Generate an IndexStmt node using information from an already existing index