From 2e0eee6037c8afb31e5ed1ea7023f4f867f9a29e Mon Sep 17 00:00:00 2001
From: tobymao <toby.mao@gmail.com>
Date: Fri, 28 Apr 2023 23:24:33 -0700
Subject: [PATCH] Fix: postgres date_part type closes #1506

---
 sqlglot/dialects/postgres.py    | 2 +-
 tests/dialects/test_postgres.py | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/sqlglot/dialects/postgres.py b/sqlglot/dialects/postgres.py
index e9bf1bdd22..1fcc83bc59 100644
--- a/sqlglot/dialects/postgres.py
+++ b/sqlglot/dialects/postgres.py
@@ -285,7 +285,7 @@ class Parser(parser.Parser):
         }
 
         def _parse_date_part(self) -> exp.Expression:
-            part = self._parse_var_or_string()
+            part = self._parse_type()
             self._match(TokenType.COMMA)
             value = self._parse_bitwise()
 
diff --git a/tests/dialects/test_postgres.py b/tests/dialects/test_postgres.py
index 4e0627fde4..13b3a9d790 100644
--- a/tests/dialects/test_postgres.py
+++ b/tests/dialects/test_postgres.py
@@ -122,6 +122,12 @@ def test_postgres(self):
         self.validate_identity("x ~ 'y'")
         self.validate_identity("x ~* 'y'")
 
+        self.validate_all(
+            "SELECT DATE_PART('isodow'::varchar(6), current_date)",
+            write={
+                "postgres": "SELECT EXTRACT(CAST('isodow' AS VARCHAR(6)) FROM CURRENT_DATE)",
+            },
+        )
         self.validate_all(
             "SELECT DATE_PART('minute', timestamp '2023-01-04 04:05:06.789')",
             write={