fix(duckdb): support casting to unsigned integer types

ibis/backends/duckdb/compiler.py

@@ -20,12 +20,24 @@ class DuckDBSQLExprTranslator(AlchemyExprTranslator):
     _dialect_name = "duckdb"
 
 
-@compiles(sat.UInt64, "duckdb")
-@compiles(sat.UInt32, "duckdb")
-@compiles(sat.UInt16, "duckdb")
 @compiles(sat.UInt8, "duckdb")
+def compile_uint8(element, compiler, **kw):
+    return "UTINYINT"
+
+
+@compiles(sat.UInt16, "duckdb")
+def compile_uint16(element, compiler, **kw):
+    return "USMALLINT"
+
+
+@compiles(sat.UInt32, "duckdb")
+def compile_uint32(element, compiler, **kw):
+    return "UINTEGER"
+
+
+@compiles(sat.UInt64, "duckdb")
 def compile_uint(element, compiler, **kw):
-    return element.__class__.__name__.upper()
+    return "UBIGINT"
 
 
 @compiles(sat.ArrayType, "duckdb")

ibis/backends/duckdb/tests/snapshots/test_datatypes/test_cast_uints/uint16/out.sql

@@ -0,0 +1,3 @@
+SELECT
+  CAST(t0.a AS USMALLINT) AS "Cast(a, uint16)"
+FROM t AS t0

ibis/backends/duckdb/tests/snapshots/test_datatypes/test_cast_uints/uint32/out.sql

@@ -0,0 +1,3 @@
+SELECT
+  CAST(t0.a AS UINTEGER) AS "Cast(a, uint32)"
+FROM t AS t0

ibis/backends/duckdb/tests/snapshots/test_datatypes/test_cast_uints/uint64/out.sql

@@ -0,0 +1,3 @@
+SELECT
+  CAST(t0.a AS UBIGINT) AS "Cast(a, uint64)"
+FROM t AS t0

ibis/backends/duckdb/tests/snapshots/test_datatypes/test_cast_uints/uint8/out.sql

@@ -0,0 +1,3 @@
+SELECT
+  CAST(t0.a AS UTINYINT) AS "Cast(a, uint8)"
+FROM t AS t0

ibis/backends/duckdb/tests/test_datatypes.py

@@ -1,4 +1,6 @@
 import pytest
+import sqlglot as sg
+from packaging.version import parse as vparse
 from pytest import param
 
 import ibis.expr.datatypes as dt
@@ -78,3 +80,18 @@
 def test_parser(typ, expected):
     ty = parse(typ)
     assert ty == expected
+
+
+@pytest.mark.parametrize("uint_type", ["uint8", "uint16", "uint32", "uint64"])
+@pytest.mark.xfail(
+    vparse(sg.__version__) < vparse("11.3.4"),
+    raises=sg.ParseError,
+    reason="sqlglot version doesn't support duckdb unsigned integer types",
+)
+def test_cast_uints(uint_type, snapshot):
+    import ibis
+
+    t = ibis.table(dict(a="int8"), name="t")
+    snapshot.assert_match(
+        str(ibis.to_sql(t.a.cast(uint_type), dialect="duckdb")), "out.sql"
+    )