[fix] SQL parsing of table names (#7490)

superset/sql_parse.py

@@ -16,10 +16,12 @@
 # under the License.
 # pylint: disable=C,R,W
 import logging
+from typing import Optional
 
 import sqlparse
-from sqlparse.sql import Identifier, IdentifierList, Token, TokenList
-from sqlparse.tokens import Keyword, Name
+from sqlparse.sql import Identifier, IdentifierList, remove_quotes, Token, TokenList
+from sqlparse.tokens import Keyword, Name, Punctuation, String, Whitespace
+from sqlparse.utils import imt
 
 RESULT_OPERATIONS = {'UNION', 'INTERSECT', 'EXCEPT', 'SELECT'}
 ON_KEYWORD = 'ON'
@@ -75,11 +77,34 @@ class ParsedQuery(object):
         return statements
 
     @staticmethod
-    def __get_full_name(tlist: TokenList):
-        if len(tlist.tokens) > 2 and tlist.tokens[1].value == '.':
-            return '{}.{}'.format(tlist.tokens[0].value,
-                                  tlist.tokens[2].value)
-        return tlist.get_real_name()
+    def __get_full_name(tlist: TokenList) -> Optional[str]:
+        """
+        Return the full unquoted table name if valid, i.e., conforms to the following
+        [[cluster.]schema.]table construct.
+
+        :param tlist: The SQL tokens
+        :returns: The valid full table name
+        """
+
+        # Strip the alias if present.
+        idx = len(tlist.tokens)
+
+        if tlist.has_alias():
+            ws_idx, _ = tlist.token_next_by(t=Whitespace)
+
+            if ws_idx != -1:
+                idx = ws_idx
+
+        tokens = tlist.tokens[:idx]
+
+        if (
+            len(tokens) in (1, 3, 5) and
+            all(imt(token, t=[Name, String]) for token in tokens[0::2]) and
+            all(imt(token, m=(Punctuation, '.')) for token in tokens[1::2])
+        ):
+            return '.'.join([remove_quotes(token.value) for token in tokens[0::2]])
+
+        return None
 
     @staticmethod
     def __is_identifier(token: Token):