See attached main.go file:

• it stored 3221225472 bytes of random data to the database
• then it tries to load all those save data to see if the write size is equal to the read size
• read ends at 3221176320 bytes with ErrWrongSize

Java client correctly reads all the data so it looks like the issue is in the GO DownloadStream. For smaller size, ~2GB it works fine - read ends with EOF and all data is read.