IssueTracker

Please provide as much information as possible. At least, this should include a description of your issue and steps to reproduce the problem. If possible please provide a summary of what steps or workarounds you have already tried, and any docs or articles you found (un)helpful.

Problem you have encountered:
Cloud SQL imports are using a single thread-core to perform imports, which imitates the ability to use a heavier load over the higher disks that Cloud SQL can use.

What you expected to happen:
Being able to indicate the amount of threads to be used in the import task.

Other information (workarounds you have tried, documentation consulted, etc):
MySQL supports to indicate to the mysqlimport command the amount of threads by the flag --use-threads=N [1].

[1] https://dev.mysql.com/doc/refman/8.0/en/mysqlimport.html#option_mysqlimport_use-threads