database: "projects/computelabs/instances/hello/databases/db"
queries:
    - name: "Benchmark1"
      sql: "select * from tweets"
      optimizers:
        - "1"
        - "2"
    - name: "Benchmark2"
      sql: "select * from tweets where likes > 5000 limit 100"
      optimizers:
        - "1"
        - "2"
    - name: "Benchmark3"
      sql: "select * from tweets where likes > 1 limit 100"
      optimizers:
        - "2"

database: "projects/YOUR_PROJECT_NAME/instances/YOUR_SPANNER_INSTANCE/databases/YOUR_SPANNER_DB"
queries:
    - name: "Benchmark1"
      sql: "select * from tweets"
      optimizers:
        - "1"
        - "2"
    - name: "Benchmark2"
      sql: "select * from tweets where likes > 5000 limit 100"
      optimizers:
        - "1"
        - "2"
    - name: "Benchmark3"
      sql: "select * from tweets where likes > 1 limit 100"
      optimizers:
        - "2"

Add placeholders for db string configuration
Add placeholders for db string configuration
