1 files changed, 25 insertions, 0 deletions
diff --git a/sqlglot/optimizer/quote_identities.py b/sqlglot/optimizer/quote_identities.py
new file mode 100644
index 0000000..17623cc
--- /dev/null
+++ b/sqlglot/optimizer/quote_identities.py
@@ -0,0 +1,25 @@
+from sqlglot import exp
+
+
+def quote_identities(expression):
+    """
+    Rewrite sqlglot AST to ensure all identities are quoted.
+
+    Example:
+        >>> import sqlglot
+        >>> expression = sqlglot.parse_one("SELECT x.a AS a FROM db.x")
+        >>> quote_identities(expression).sql()
+        'SELECT "x"."a" AS "a" FROM "db"."x"'
+
+    Args:
+        expression (sqlglot.Expression): expression to quote
+    Returns:
+        sqlglot.Expression: quoted expression
+    """
+
+    def qualify(node):
+        if isinstance(node, exp.Identifier):
+            node.set("quoted", True)
+        return node
+
+    return expression.transform(qualify, copy=False)