projjal commented on a change in pull request #12440:
URL: https://github.com/apache/arrow/pull/12440#discussion_r827652674
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File path: cpp/src/gandiva/precompiled/string_ops.cc
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@@ -2209,26 +2215,37 @@ const char* right_utf8_int32(gdv_int64 context, const
char* text, gdv_int32 text
// initially counts the number of utf8 characters in the defined text
int32_t char_count = utf8_length(context, text, text_len);
+
// char_count is zero if input has invalid utf8 char
if (char_count == 0) {
*out_len = 0;
return "";
}
+ //case where right('abcdef', -6) -> "" and right('abcdef', -7) -> ""
+ if(number < 0 && abs(number) >= char_count) {
+ *out_len = 0;
+ return "";
+ }
+
int32_t start_char_pos; // the char result start position (inclusive)
- int32_t end_char_len; // the char result end position (inclusive)
+ int32_t end_pos; // the char result end position (inclusive)
+
if (number > 0) {
// case where right('abc', 5) ==> 'abc' start_char_pos=1.
start_char_pos = (char_count > number) ? char_count - number : 0;
- end_char_len = char_count - start_char_pos;
} else {
start_char_pos = number * -1;
- end_char_len = char_count - start_char_pos;
}
- // calculate the start byte position and the output length
+ end_pos = char_count;
+
+ // calculate the start byte and end byte position
int32_t start_byte_pos = utf8_byte_pos(context, text, text_len,
start_char_pos);
- *out_len = utf8_byte_pos(context, text, text_len, end_char_len);
+ int32_t end_byte_pos = utf8_byte_pos(context, text, text_len, end_pos);
Review comment:
Calculating this doesn't seem necessary
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