denormalizing in google cloud sql prior to uploading to bigquery

I need to denormalize a db and I have a sql dump of the db as well as corresponding csv files for the tables in the dump.  I need to denormalize the data and eventually upload into bigquery.  bigquery doesn't look like the platform to denormalize the data.  I was considering using google cloud sql to denormalize, running a number of join scripts on the tables.  I have tables with the following number of rows:

T1: 400M rows

T2: 2M    rows

T3: 800K rows

+ about 10 other tables with between 10K - 300K rows

Is google cloud sql a possible solution?  Suggestions?  Thank you

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