{
    "schemaName": "clickstream",
    "dimensionFieldSpecs": [
      {
        "name": "user_id",
        "dataType": "INT"
      },
      {
        "name": "web_page",
        "dataType": "STRING"
      },
      {
        "name": "order",
        "dataType": "INT"
      },
      {
        "name": "location",
        "dataType": "STRING"
      },
      {
        "name": "visit",
        "dataType": "INT"
      }
    ],
    "dateTimeFieldSpecs": [
      {
        "name": "ts",
        "dataType": "TIMESTAMP",
        "format": "1:MILLISECONDS:EPOCH",
        "granularity": "1:MILLISECONDS"
      }
    ]
  }