kangkaisen commented on a change in pull request #3439:
URL: https://github.com/apache/incubator-doris/pull/3439#discussion_r417732926
##########
File path: be/src/exprs/string_functions.cpp
##########
@@ -212,6 +212,28 @@ StringVal StringFunctions::rpad(
}
return result;
}
+
+StringVal
StringFunctions::append_trailing_char_if_absent(doris_udf::FunctionContext*
context,
+ const doris_udf::StringVal& str, const doris_udf::StringVal&
trailing_char) {
+ if (str.is_null || trailing_char.is_null) {
+ return StringVal::null();
+ }
+ if (str.len == 0) {
+ return trailing_char;
+ }
+ if (str.ptr[str.len-1] == trailing_char.ptr[0]) {
+ return str;
+ }
+
+ StringVal result(context, str.len + trailing_char.len);
+ if (UNLIKELY(result.is_null)) {
Review comment:
Why new result could null?
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