1 files changed, 13 insertions, 3 deletions
diff --git a/sqlglot/expressions.py b/sqlglot/expressions.py
index fdf02c8..242e66c 100644
--- a/sqlglot/expressions.py
+++ b/sqlglot/expressions.py
@@ -274,12 +274,16 @@ class Expression(metaclass=_Expression):
 
     def set(self, arg_key: str, value: t.Any) -> None:
         """
-        Sets `arg_key` to `value`.
+        Sets arg_key to value.
 
         Args:
-            arg_key (str): name of the expression arg.
+            arg_key: name of the expression arg.
             value: value to set the arg to.
         """
+        if value is None:
+            self.args.pop(arg_key, None)
+            return
+
         self.args[arg_key] = value
         self._set_parent(arg_key, value)
 
@@ -2278,6 +2282,7 @@ class Table(Expression):
         "pivots": False,
         "hints": False,
         "system_time": False,
+        "wrapped": False,
     }
 
     @property
@@ -4249,7 +4254,7 @@ class JSONArrayContains(Binary, Predicate, Func):
 
 
 class Least(Func):
-    arg_types = {"expressions": False}
+    arg_types = {"this": True, "expressions": False}
     is_var_len_args = True
 
 
@@ -4342,6 +4347,11 @@ class MD5(Func):
     _sql_names = ["MD5"]
 
 
+# Represents the variant of the MD5 function that returns a binary value
+class MD5Digest(Func):
+    _sql_names = ["MD5_DIGEST"]
+
+
 class Min(AggFunc):
     arg_types = {"this": True, "expressions": False}
     is_var_len_args = True