[5.2.x] Refs #33647 -- Fixed silent data truncation in bulk_create on Postgres.

Regression in a16eedcf9c69d8a11d94cac1811018c5b996d491.

The UNNEST strategy is affected by the same problem bulk_update has wrt/
to silent data truncation due to its usage of db_type which always returns
a parametrized subtype.

Backport of d6ae2ed868e43671afc4d433c3d8f4d27f7eb555 from main.

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/backends/postgresql/test_compilation.py b/tests/backends/postgresql/test_compilation.py
index 11c4015e01..2053c18a1a 100644
--- a/tests/backends/postgresql/test_compilation.py
+++ b/tests/backends/postgresql/test_compilation.py
@@ -3,6 +3,7 @@ from datetime import date
 
 from django.db import connection
 from django.db.models.expressions import RawSQL
+from django.db.utils import DataError
 from django.test import TestCase
 
 from ..models import Article, Reporter, Square
@@ -42,3 +43,12 @@ class BulkCreateUnnestTests(TestCase):
         self.assertEqual(
             [article.reporter for article in articles], [reporter, reporter]
         )
+
+    def test_parametrized_db_type(self):
+        with self.assertRaises(DataError):
+            Reporter.objects.bulk_create(
+                [
+                    Reporter(),
+                    Reporter(first_name="a" * 31),
+                ]
+            )