vvellanki commented on a change in pull request #11551:
URL: https://github.com/apache/arrow/pull/11551#discussion_r744619768
##########
File path: cpp/src/gandiva/gdv_function_stubs.cc
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@@ -794,6 +795,88 @@ 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 nullptr;
+ }
+
+ if (n_to_mask < 0) {
+ n_to_mask = n_to_mask * (-1);
+ }
+
+ *out_len = data_len;
+
+ 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 nullptr;
+ }
+
+ // do the masking
+ for (int i = 0; i < data_len; ++i) {
+ if(isdigit(data[i]) && i < n_to_mask) {
Review comment:
To mask first 2 characters, is it masking 4 bytes in total?
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