如何让数据库/ sql并行查询多个模式？

I have mysql database with single host and a few hundred schemas, where each schemas have identical tables (and different amount of rows). What I want to do here is to query some (or all) schemas with same list of queries, and save these result for later use.
I'm using golang's database/sql for querying database, and I want to do that with single connection pool, and by querying each schemas in parallel (hoping it's faster that way).
I'm imagining something like this:

func QuerySchemas(queryList []string, schemaList []string) {
  // Create a connection pool
  db, err := sql.Open("mysql", "user:password@tcp(db_host)/")
  if err != nil {
    log.Fatal(err)
  }

  for _, schema := range schemaList {
    // Query each schema in parallel, probably with goroutine
    go func(targetSchema string) {
      // ...
      // Let database/sql use targetSchema for this goroutine
      // ...
      for _, query := range queryList {
        rows, err := db.Query(query)
        // ...
        // Save results and do other things
        // ...
      } 
    }(schema) 
  }
}

But I can't find how to let database/sql query different schemas in parallel. So far I have thought of using MySQL's USE sentences, but that would not work as it changes schema for all goroutines.
Is there any possible solutions?