By default, its number of threads when inserting data from an EXCEL file into the DB is 5 currently.
It has a bug in that part so that it takes even longer than thread=1, which means it doesn't work correctly. Even worse, data in the table are twisted from each of thread because of frequent deadlock.
Fixed to be:
fixing multi-threading INSERT operation to be correctly working.
Otherwise not support multi-threads when importing data.
Make the default value to be 1 (single thread). 5 threads surely makes deadlock.