const AWS = require('aws-sdk');
 const docClient = new AWS.DynamoDB.DocumentClient();

 exports.handler = async (event) => {

    let params4 = {
      TableName: "pool4-dev",
      IndexName: "index-datetime",
      KeyConditionExpression: "#date = :dateValue",
      FilterExpression: "#idx1 = :idx1 AND begins_with(#id,:id) ",
      ExpressionAttributeNames: {
        "#date": "date",
        "#idx1": "idx1",
        "#id": "id"
      },
      ExpressionAttributeValues: {
        ":dateValue": '2019-01-01',
        ":idx1": 'WELL-34243-234243',
        ":id": "DATAPOINTDATA"
      }
    };
    // console.log("params4===========", params4);
    try {
      var data = await docClient.query(params4).promise();
      console.log("data.Items ============", data.Items);
    } catch (err) {
      console.log(err);
      return err;
    }

    // TODO implement
    const response = {
        statusCode: 200,
        body: JSON.stringify('Hello from Lambda!'),
    };
    return response;
};