feat(polars): add ArrayUnion operation (#10330)

Author: IndexSeek

ibis/backends/polars/compiler.py

@@ -1532,3 +1532,10 @@ def visit_ArrayRemove(op, **kw):
     arg = translate(op.arg, **kw)
     value = _literal_value(op.other)
     return arg.list.set_difference(pl.lit([value]))
+
+
+@translate.register(ops.ArrayUnion)
+def visit_ArrayUnion(op, **kw):
+    left = translate(op.left, **kw)
+    right = translate(op.right, **kw)
+    return left.list.set_union(right)

ibis/backends/tests/test_array.py

@@ -832,7 +832,6 @@ def test_array_sort(con, data):
 
 
 @builtin_array
-@pytest.mark.notimpl(["polars"], raises=com.OperationNotDefinedError)
 @pytest.mark.parametrize(
     ("a", "b", "expected_array"),
     [
@@ -853,9 +852,9 @@ def test_array_sort(con, data):
                     reason="BigQuery doesn't support arrays with null elements",
                 ),
                 pytest.mark.notyet(
-                    ["datafusion"],
+                    ["datafusion", "polars"],
                     raises=AssertionError,
-                    reason="DataFusion transforms null elements to NAN",
+                    reason="Null elements are transformed to NaN",
                 ),
                 pytest.mark.notyet(
                     ["pyspark"],