augustoasilva commented on a change in pull request #11551:
URL: https://github.com/apache/arrow/pull/11551#discussion_r743326012
##########
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) {
+ if (n_to_mask > 0 && counter < n_to_mask && isalnum(c)) {
+ if (isdigit(c)) {
+ c = 'n';
+ } else {
+ if (isupper(c)) {
+ c = 'X';
+ } else {
+ c = 'x';
+ }
+ }
+ counter++;
+ }
+ }
+
+ *out_len = static_cast<int32_t>(str.size());
+
+ char* out = reinterpret_cast<char*>(gdv_fn_context_arena_malloc(context,
*out_len));
+ if (out == nullptr) {
+ gdv_fn_context_set_error_msg(context, "Could not allocate memory for
output string");
+ *out_len = 0;
+ return "";
+ }
+
+ memcpy(out, str.c_str(), *out_len);
+ return out;
+}
+
+GANDIVA_EXPORT
+const char* gdv_fn_mask_last_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);
+ std::reverse(str.begin(), str.end());
Review comment:
It was simple to implement, but the new code is way lighter and simpler
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