From 5f9030786f8489e70aee70acabee440ecf23699c Mon Sep 17 00:00:00 2001
From: Jo <46752250+georgesittas@users.noreply.github.com>
Date: Tue, 4 Feb 2025 17:59:40 +0200
Subject: [PATCH] Fix(duckdb): enable support for user-defined types (#4702)

---
 sqlglot/dialects/duckdb.py    | 2 +-
 tests/dialects/test_duckdb.py | 1 +
 tests/test_transpile.py       | 2 +-
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/sqlglot/dialects/duckdb.py b/sqlglot/dialects/duckdb.py
index 31c0903faf..7041bfba28 100644
--- a/sqlglot/dialects/duckdb.py
+++ b/sqlglot/dialects/duckdb.py
@@ -272,7 +272,7 @@ def _json_extract_value_array_sql(
 
 class DuckDB(Dialect):
     NULL_ORDERING = "nulls_are_last"
-    SUPPORTS_USER_DEFINED_TYPES = False
+    SUPPORTS_USER_DEFINED_TYPES = True
     SAFE_DIVISION = True
     INDEX_OFFSET = 1
     CONCAT_COALESCE = True
diff --git a/tests/dialects/test_duckdb.py b/tests/dialects/test_duckdb.py
index 959a1b3fef..648504c7a5 100644
--- a/tests/dialects/test_duckdb.py
+++ b/tests/dialects/test_duckdb.py
@@ -256,6 +256,7 @@ def test_duckdb(self):
             parse_one("a // b", read="duckdb").assert_is(exp.IntDiv).sql(dialect="duckdb"), "a // b"
         )
 
+        self.validate_identity("CAST(x AS FOO)")
         self.validate_identity("SELECT UNNEST([1, 2])").selects[0].assert_is(exp.UDTF)
         self.validate_identity("'red' IN flags").args["field"].assert_is(exp.Column)
         self.validate_identity("'red' IN tbl.flags")
diff --git a/tests/test_transpile.py b/tests/test_transpile.py
index bb8d032f6d..db14cedc4e 100644
--- a/tests/test_transpile.py
+++ b/tests/test_transpile.py
@@ -610,7 +610,7 @@ def test_types(self):
         self.validate("CAST(x AS INT)::BOOLEAN", "CAST(CAST(x AS INT) AS BOOLEAN)")
 
         with self.assertRaises(ParseError):
-            transpile("x::z", read="duckdb")
+            transpile("x::z", read="clickhouse")
 
     def test_not_range(self):
         self.validate("a NOT LIKE b", "NOT a LIKE b")