Amazon RDS Parquet files To Local MySQL Database

I am trying to replicate an Amazon RDS database to local my local database. I have saved the backups to an Amazon S3 Bucket and get the files using downloadDirectory. The database is stored as parquet files. I have created a spark session to read and import the data to the local database however I am not getting any information on primary keys, indexes, and such. How can I get the information of the tables with the data from the parquet files? Thank you very much!