add informative exception context for literal render

An informative re-raise is now thrown in the case where any "literal
bindparam" render operation fails, indicating the value itself and
the datatype in use, to assist in debugging when literal params
are being rendered in a statement.

Fixes: #8800
Change-Id: Id658f8b03359312353ddbb0c7563026239579f7b

1 files changed, 46 insertions, 0 deletions

diff --git a/test/sql/test_compiler.py b/test/sql/test_compiler.py
index 97b1b9124..4eea11795 100644
--- a/test/sql/test_compiler.py
+++ b/test/sql/test_compiler.py
@@ -98,6 +98,7 @@ from sqlalchemy.testing import is_true
 from sqlalchemy.testing import mock
 from sqlalchemy.testing import ne_
 from sqlalchemy.testing.schema import pep435_enum
+from sqlalchemy.types import UserDefinedType
 
 table1 = table(
     "mytable",
@@ -4609,6 +4610,51 @@ class BindParameterTest(AssertsCompiledSQL, fixtures.TestBase):
             "OR mytable.myid = :myid_2 OR mytable.myid = :myid_3",
         )
 
+    @testing.combinations("plain", "expanding", argnames="exprtype")
+    def test_literal_bind_typeerror(self, exprtype):
+        """test #8800"""
+
+        if exprtype == "expanding":
+            stmt = select(table1).where(
+                table1.c.myid.in_([("tuple",), ("tuple",)])
+            )
+        elif exprtype == "plain":
+            stmt = select(table1).where(table1.c.myid == ("tuple",))
+        else:
+            assert False
+
+        with expect_raises_message(
+            exc.CompileError,
+            r"Could not render literal value \"\(\'tuple\',\)\" "
+            r"with datatype INTEGER; see parent "
+            r"stack trace for more detail.",
+        ):
+            stmt.compile(compile_kwargs={"literal_binds": True})
+
+    @testing.combinations("plain", "expanding", argnames="exprtype")
+    def test_literal_bind_dont_know_how_to_quote(self, exprtype):
+        """test #8800"""
+
+        class MyType(UserDefinedType):
+            def get_col_spec(self, **kw):
+                return "MYTYPE"
+
+        col = column("x", MyType())
+
+        if exprtype == "expanding":
+            stmt = select(table1).where(col.in_([("tuple",), ("tuple",)]))
+        elif exprtype == "plain":
+            stmt = select(table1).where(col == ("tuple",))
+        else:
+            assert False
+
+        with expect_raises_message(
+            exc.CompileError,
+            r"No literal value renderer is available for literal "
+            r"value \"\('tuple',\)\" with datatype MYTYPE",
+        ):
+            stmt.compile(compile_kwargs={"literal_binds": True})
+
     @testing.fixture
     def ansi_compiler_fixture(self):
         dialect = default.DefaultDialect()