1 files changed, 58 insertions, 0 deletions
diff --git a/src/arrow/cpp/src/gandiva/decimal_type_util_test.cc b/src/arrow/cpp/src/gandiva/decimal_type_util_test.cc
new file mode 100644
index 000000000..98ea0bb16
--- /dev/null
+++ b/src/arrow/cpp/src/gandiva/decimal_type_util_test.cc
@@ -0,0 +1,58 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+// Adapted from Apache Impala
+
+#include <gtest/gtest.h>
+
+#include "gandiva/decimal_type_util.h"
+#include "tests/test_util.h"
+
+namespace gandiva {
+
+#define DECIMAL_TYPE(p, s) DecimalTypeUtil::MakeType(p, s)
+
+Decimal128TypePtr DoOp(DecimalTypeUtil::Op op, Decimal128TypePtr d1,
+                       Decimal128TypePtr d2) {
+  Decimal128TypePtr ret_type;
+  ARROW_EXPECT_OK(DecimalTypeUtil::GetResultType(op, {d1, d2}, &ret_type));
+  return ret_type;
+}
+
+TEST(DecimalResultTypes, Basic) {
+  EXPECT_ARROW_TYPE_EQUALS(
+      DECIMAL_TYPE(31, 10),
+      DoOp(DecimalTypeUtil::kOpAdd, DECIMAL_TYPE(30, 10), DECIMAL_TYPE(30, 10)));
+
+  EXPECT_ARROW_TYPE_EQUALS(
+      DECIMAL_TYPE(32, 6),
+      DoOp(DecimalTypeUtil::kOpAdd, DECIMAL_TYPE(30, 6), DECIMAL_TYPE(30, 5)));
+
+  EXPECT_ARROW_TYPE_EQUALS(
+      DECIMAL_TYPE(38, 9),
+      DoOp(DecimalTypeUtil::kOpAdd, DECIMAL_TYPE(30, 10), DECIMAL_TYPE(38, 10)));
+
+  EXPECT_ARROW_TYPE_EQUALS(
+      DECIMAL_TYPE(38, 9),
+      DoOp(DecimalTypeUtil::kOpAdd, DECIMAL_TYPE(38, 10), DECIMAL_TYPE(38, 38)));
+
+  EXPECT_ARROW_TYPE_EQUALS(
+      DECIMAL_TYPE(38, 6),
+      DoOp(DecimalTypeUtil::kOpAdd, DECIMAL_TYPE(38, 10), DECIMAL_TYPE(38, 2)));
+}
+
+}  // namespace gandiva