getSchema() {
    // Increase the max rows without modifiying original connection
    const connectionMaxed = {
      ...this.connection,
      // 1 million rows ought to be enough for pulling schema.
      // Schema probably needs to be broken up into getting tables (and their schemas), and then batching column reads
      maxRows: 1000000,
    };
    return this.driver.getSchema(connectionMaxed);
  }
Gets schema (sometimes called schemaInfo) for connection
This data is used by client to build schema tree in editor sidebar
@returns {Promise}