augustoasilva commented on a change in pull request #11551:
URL: https://github.com/apache/arrow/pull/11551#discussion_r743325850



##########
File path: cpp/src/gandiva/gdv_function_stubs.cc
##########
@@ -794,6 +795,83 @@ const char* gdv_fn_initcap_utf8(int64_t context, const 
char* data, int32_t data_
   *out_len = out_idx;
   return out;
 }
+
+GANDIVA_EXPORT
+const char* gdv_fn_mask_first_n(int64_t context, const char* data, int32_t 
data_len,
+                                int32_t n_to_mask, int32_t* out_len) {
+  if (data_len <= 0) {
+    *out_len = 0;
+    return "";

Review comment:
       Yes, it should, so I fixed

##########
File path: cpp/src/gandiva/gdv_function_stubs.cc
##########
@@ -794,6 +795,83 @@ const char* gdv_fn_initcap_utf8(int64_t context, const 
char* data, int32_t data_
   *out_len = out_idx;
   return out;
 }
+
+GANDIVA_EXPORT
+const char* gdv_fn_mask_first_n(int64_t context, const char* data, int32_t 
data_len,
+                                int32_t n_to_mask, int32_t* out_len) {
+  if (data_len <= 0) {
+    *out_len = 0;
+    return "";
+  }
+
+  std::string str(data, data_len);
+  int32_t counter = 0;
+  for (char& c : str) {

Review comment:
       I did a new implementation without std::string, and more simple and 
efficiente on the for loop




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