Separate statements in reindent_aligned output (issue673)

CHANGELOG

@@ -1,7 +1,12 @@
 Development Version
 -------------------
 
-Nothing yet.
+Bug Fixes
+
+* `format(sql, reindent_aligned=True)` no longer runs consecutive statements
+  together on one line. `reindent_aligned` implies `strip_whitespace`, which
+  removes the whitespace separating the statements, and unlike `reindent` the
+  aligned filter never put a separator back (issue673).
 
 
 Release 0.6.0 (Aug 13, 2026)

sqlparse/filters/aligned_indent.py

@@ -28,6 +28,7 @@ def __init__(self, char=' ', n='\n'):
         self.indent = 0
         self.char = char
         self._max_kwd_len = len('select')
+        self._last_stmt = None
 
     def nl(self, offset=1):
         # offset = 1 represent a single space after SELECT
@@ -133,4 +134,14 @@ def _process(self, tlist):
 
     def process(self, stmt):
         self._process(stmt)
+
+        # reindent_aligned implies strip_whitespace, so the whitespace that
+        # separated this statement from the previous one is gone by now. Put a
+        # separator back, the way ReindentFilter does, or the statements are
+        # emitted glued together.
+        if self._last_stmt is not None:
+            nl = '\n' if str(self._last_stmt).endswith('\n') else '\n\n'
+            stmt.tokens.insert(0, sql.Token(T.Whitespace, nl))
+
+        self._last_stmt = stmt
         return stmt

tests/test_format.py

@@ -345,6 +345,16 @@ def test_window_functions(self):
             '(PARTITION BY b, c ORDER BY d DESC) as row_num',
             '  from table'])
 
+    def test_multiple_statements_are_separated(self):
+        # issue673
+        sql = 'select a from t1;\nselect b from t2;\n'
+        assert self.formatter(sql) == '\n'.join([
+            'select a',
+            '  from t1;',
+            '',
+            'select b',
+            '  from t2;'])
+
 
 class TestSpacesAroundOperators:
     @staticmethod