fix: ParsedQuery subselect edge case (#13602)

superset/sql_parse.py

@@ -21,7 +21,14 @@
 from urllib import parse
 
 import sqlparse
-from sqlparse.sql import Identifier, IdentifierList, remove_quotes, Token, TokenList
+from sqlparse.sql import (
+    Identifier,
+    IdentifierList,
+    Parenthesis,
+    remove_quotes,
+    Token,
+    TokenList,
+)
 from sqlparse.tokens import Keyword, Name, Punctuation, String, Whitespace
 from sqlparse.utils import imt
 
@@ -278,7 +285,9 @@ def _extract_from_token(  # pylint: disable=too-many-branches
         table_name_preceding_token = False
 
         for item in token.tokens:
-            if item.is_group and not self._is_identifier(item):
+            if item.is_group and (
+                not self._is_identifier(item) or isinstance(item.tokens[0], Parenthesis)
+            ):
                 self._extract_from_token(item)
 
             if item.ttype in Keyword and (
@@ -291,7 +300,6 @@ def _extract_from_token(  # pylint: disable=too-many-branches
             if item.ttype in Keyword:
                 table_name_preceding_token = False
                 continue
-
             if table_name_preceding_token:
                 if isinstance(item, Identifier):
                     self._process_tokenlist(item)

tests/sql_parse_tests.py

@@ -158,6 +158,13 @@ def test_select_in_expression(self):
         query = "SELECT f1, (SELECT count(1) FROM t2) FROM t1"
         self.assertEqual({Table("t1"), Table("t2")}, self.extract_tables(query))
 
+        query = "SELECT f1, (SELECT count(1) FROM t2) as f2 FROM t1"
+        self.assertEqual({Table("t1"), Table("t2")}, self.extract_tables(query))
+
+    def test_parentheses(self):
+        query = "SELECT f1, (x + y) AS f2 FROM t1"
+        self.assertEqual({Table("t1")}, self.extract_tables(query))
+
     def test_union(self):
         query = "SELECT * FROM t1 UNION SELECT * FROM t2"
         self.assertEqual({Table("t1"), Table("t2")}, self.extract_tables(query))