Method _getSingleFunction

lib/metadata/index.js:710–725

* Gets a single cql function or aggregate definition * @param {String} keyspaceName * @param {String} name * @param {Array} signature * @param {Boolean} aggregate * @returns {Promise } * @private

(keyspaceName, name, signature, aggregate)

   * @private
   */
  async _getSingleFunction(keyspaceName, name, signature, aggregate) {
    if (!keyspaceName || !name) {
      throw new errors.ArgumentError('You must provide the keyspace name and cql function name to retrieve the metadata');
    }
    if (!Array.isArray(signature)) {
      throw new errors.ArgumentError('Signature must be an array of types');
    }
    signature = signature.map(item => {
      if (typeof item === 'string') {
        return item;
      }
      return types.getDataTypeNameByCode(item);
    });
    const functionsMap = await this._getFunctions(keyspaceName, name, aggregate);
    return functionsMap.get(signature.join(',')) || null;
  }

  /**
   * Gets the trace session generated by Cassandra when query tracing is enabled for the