Saving arbitrary data to avro files

[yael aharon]

Hello,
I am writing a C++ library that stores arbitrary data to avro files.
The schema is given to me through my library's API.
All the data is given to me in the form of strings; including integers,
doubles, etc.
Is there a way for me to store this data to avro files without converting
the strings to the correct types first? I am concerned about the
performance impact that this conversion would have
thanks, Yael