Add class to print in formatted way

cpp/src/gandiva/formatting_utils.h

@@ -0,0 +1,69 @@
+// 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.
+
+
+#pragma once
+
+#include "arrow/util/formatting.h"
+#include "arrow/type.h"
+#include "arrow/vendored/double-conversion/double-conversion.h"
+
+#ifndef ARROW_SRC_GANDIVA_FORMATTING_UTILS_H_
+#define ARROW_SRC_GANDIVA_FORMATTING_UTILS_H_
+
+namespace gandiva {
+
+/// \brief The entry point for conversion to strings.
+template <typename ARROW_TYPE, typename Enable = void>
+class GdvStringFormatter;
+
+template<typename ARROW_TYPE>
+class FloatToStringGdvMixin :
+    public arrow::internal::FloatToStringFormatterMixin<ARROW_TYPE>{
+
+ public:
+  using arrow::internal::FloatToStringFormatterMixin<ARROW_TYPE>::FloatToStringFormatterMixin;
+
+  explicit FloatToStringGdvMixin(const std::shared_ptr<arrow::DataType>& = NULLPTR)
+    : arrow::internal::FloatToStringFormatterMixin<ARROW_TYPE>()
+  {
+    const int flags =
+        double_conversion::DoubleToStringConverter::EMIT_TRAILING_ZERO_AFTER_POINT |
+            double_conversion::DoubleToStringConverter::EMIT_TRAILING_DECIMAL_POINT;
+
+    double_conversion::DoubleToStringConverter return_(flags, "inf", "nan",
+                                                       'E', -3, 7, 6, 1);
+
+    this->impl_->converter_ = return_;
+  }
+};
+
+template <>
+class GdvStringFormatter<arrow::FloatType> :
+    public FloatToStringGdvMixin<arrow::FloatType> {
+ public:
+  using FloatToStringGdvMixin::FloatToStringGdvMixin;
+};
+
+template <>
+class GdvStringFormatter<arrow::DoubleType> :
+    public FloatToStringGdvMixin<arrow::DoubleType> {
+ public:
+  using FloatToStringGdvMixin::FloatToStringGdvMixin;
+};
+}
+#endif //ARROW_SRC_GANDIVA_FORMATTING_UTILS_H_

cpp/src/gandiva/gdv_function_stubs.cc

@@ -17,7 +17,6 @@
 
 #include "gandiva/gdv_function_stubs.h"
 
-#include <cstdlib>
 #include <string>
 #include <vector>
 
@@ -31,6 +30,7 @@
 #include "gandiva/precompiled/types.h"
 #include "gandiva/random_generator_holder.h"
 #include "gandiva/to_date_holder.h"
+#include "gandiva/formatting_utils.h"
 
 /// Stub functions that can be accessed from LLVM or the pre-compiled library.