WingsGo commented on a change in pull request #2501: Support more schema change
from VARCHAR type
URL: https://github.com/apache/incubator-doris/pull/2501#discussion_r361261012
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File path: be/src/olap/types.h
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@@ -255,6 +255,36 @@ struct BaseFieldtypeTraits : public
CppTypeTraits<field_type> {
}
};
+template <typename T>
+OLAPStatus convert_int_from_varchar(void* dest, const void* src) {
+ using SrcType = typename CppTypeTraits<OLAP_FIELD_TYPE_VARCHAR>::CppType;
+ auto src_value = reinterpret_cast<const SrcType*>(src);
+ StringParser::ParseResult parse_res;
+ T result = StringParser::string_to_int<T>(src_value->get_data(),
src_value->get_size(), &parse_res);
+ if (UNLIKELY(parse_res != StringParser::PARSE_SUCCESS)) {
+ return OLAPStatus::OLAP_ERR_INVALID_SCHEMA;
+ }
+ if (typeid(T) == typeid(CppTypeTraits<OLAP_FIELD_TYPE_LARGEINT>::CppType))
{
Review comment:
> I think typeid is a runtime operation whose performance may be bad.
> I think there are two choices for you
>
> 1. write a specialization for largeint
> 2. use memcpy for all the type
done
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