From adc950945025d436ef97095b4e706700ebae34ff Mon Sep 17 00:00:00 2001
From: Bryan Forbes <bryan@reigndropsfall.net>
Date: Thu, 15 Apr 2021 12:35:52 -0500
Subject: Derive `next_value.type` from `Sequence.data_type` if available

Fixes #6287

Change-Id: I7d428ed86cd72cd910bfff9058a52c7fcb7c64ac
---
 lib/sqlalchemy/sql/functions.py | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lib/sqlalchemy/sql')

diff --git a/lib/sqlalchemy/sql/functions.py b/lib/sqlalchemy/sql/functions.py
index d71926a1f..02ed55100 100644
--- a/lib/sqlalchemy/sql/functions.py
+++ b/lib/sqlalchemy/sql/functions.py
@@ -1064,6 +1064,9 @@ class next_value(GenericFunction):
         ), "next_value() accepts a Sequence object as input."
         self._bind = self._get_bind(kw)
         self.sequence = seq
+        self.type = sqltypes.to_instance(
+            seq.data_type or getattr(self, "type", None)
+        )
 
     def compare(self, other, **kw):
         return (
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