Convert to ostringstream instead of std::to_string which had compiler errors.

Author: lriggs

cpp/src/gandiva/encrypt_utils.cc

@@ -16,7 +16,7 @@
 // under the License.
 
 #include "gandiva/encrypt_utils.h"
-#include <string.h>
+#include <sstream>
 
 #include <stdexcept>
 
@@ -29,8 +29,11 @@ const EVP_CIPHER* get_cipher_algo(int32_t key_length) {
       return EVP_aes_192_ecb();
     case 32:
       return EVP_aes_256_ecb();
-    default:
-      throw std::runtime_error("unsupported key length: " + std::to_string(key_length));
+    default: {
+      std::ostringstream oss;
+      oss << "unsupported key length: " << key_length;
+      throw std::runtime_error(oss.str());
+    }
   }
 }
 }  // namespace

cpp/src/gandiva/gdv_function_stubs.cc

@@ -20,6 +20,7 @@
 #include <utf8proc.h>
 
 #include <boost/crc.hpp>
+#include <sstream>
 #include <string>
 #include <vector>
 
@@ -320,9 +321,11 @@ const char* gdv_fn_aes_encrypt(int64_t context, const char* data, int32_t data_l
   if (key_data_len == 16 || key_data_len == 24 || key_data_len == 32) {
     kAesBlockSize = static_cast<int64_t>(key_data_len);
   } else {
+    std::ostringstream oss;
+    oss << "invalid key length: " << key_data_len;
     gdv_fn_context_set_error_msg(
         context,
-        (std::string("invalid key length: ") + std::to_string(key_data_len)).c_str());
+        oss.str().c_str());
     *out_len = 0;
     return nullptr;
   }
@@ -364,9 +367,11 @@ const char* gdv_fn_aes_decrypt(int64_t context, const char* data, int32_t data_l
   if (key_data_len == 16 || key_data_len == 24 || key_data_len == 32) {
     kAesBlockSize = static_cast<int64_t>(key_data_len);
   } else {
+    std::ostringstream oss;
+    oss << "invalid key length: " << key_data_len;
     gdv_fn_context_set_error_msg(
         context,
-        (std::string("invalid key length: ") + std::to_string(key_data_len)).c_str());
+        oss.str().c_str());
     *out_len = 0;
     return nullptr;
   }