vvellanki commented on a change in pull request #11287:
URL: https://github.com/apache/arrow/pull/11287#discussion_r743394148
##########
File path: cpp/src/gandiva/gdv_function_stubs.cc
##########
@@ -794,6 +795,39 @@ const char* gdv_fn_initcap_utf8(int64_t context, const
char* data, int32_t data_
*out_len = out_idx;
return out;
}
+
+GANDIVA_EXPORT
+int32_t gdv_fn_instr_utf8(int64_t context, const char* string, int32_t
string_len,
+ const char* substring, int32_t substring_len) {
+ if (string_len == 0 && substring_len == 0) {
Review comment:
This code is going to run for all the rows in the table. So, it is
important to avoid if-statements in the code.
How about the following:
if (substring_len == 0) { return 1; } // I see instr('', '') returning 1.
So, there is no need to check for string_len
##########
File path: cpp/src/gandiva/gdv_function_stubs.cc
##########
@@ -794,6 +795,39 @@ const char* gdv_fn_initcap_utf8(int64_t context, const
char* data, int32_t data_
*out_len = out_idx;
return out;
}
+
+GANDIVA_EXPORT
+int32_t gdv_fn_instr_utf8(int64_t context, const char* string, int32_t
string_len,
+ const char* substring, int32_t substring_len) {
+ if (string_len == 0 && substring_len == 0) {
+ return 1;
+ }
+
+ if (substring_len == 0) {
+ return 1;
+ }
+
+ if (string_len == 0) {
+ return 0;
+ }
+
+ int32_t match = 0;
+ int32_t pos = 0;
+ for (int i = 0; i < string_len; ++i) {
+ if (string[i] == substring[match]) {
Review comment:
This is incorrect - if string = "Hello World" and substring = "HW", this
implementation will return 1
You should change this to:
for(int i = 0; i < string_len; i++) {
if (string[i] == substring[0] && stringMatches(string + 1, substring + 1,
substring_len - 1)) {
return (i + 1);
}
}
return 0;
stringMatches(const char *string, const char *substring, int substring_len) {
for(int i = 0; i < substring_len; i++) {
if (string[i] != substring[i]) {
return false;
}
}
return true;
}
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