Support for WHO trials

[arnabnference]

Add support for searching WHO trials. Implement logic to allow the user to search for clinical trials in clinicaltrials.gov data, the WHO data or BOTH. There will be a new field in the records (Mongo) and a new column in HyC data that will indicate the source of the data. So the user will have an option to choose the data source, (Only CT, Only WHO, BOTH).

[arnabnference]

https://docs.google.com/document/d/1OgNCKWlFQ-w5v6VdEVEoH-86LS6NgVS8dEpa3uzIDmE/edit https://arnab.nferx.com/records/results?token=+"enrollment"%3A%28>%3D+210+and+<+700%29

[arnabnference]

rest attached

POST https://preview.nferx.com/dv/clinical_trial_20191205/semantics/v2/get_column_data?corpus=clinical_trial HTTP/1.1
accept: application/json, text/plain, */*
accept-encoding: gzip, deflate, br
accept-language: en-GB,en-US;q=0.9,en;q=0.8
content-length: 291
content-type: application/json
cookie: csrftoken=Q6IOuVye9r8TH3vAnkVvGcMzb2JHFKGD; sessionid=ar2fq32gz13lsi11jqii3u9i6ry84ss3
origin: https://preview.nferx.com
referer: https://preview.nferx.com/records/results?token=+%22enrollment%22%3A%28%3E%3D+210+and+%3C+700%29
sec-fetch-dest: empty
sec-fetch-mode: cors
sec-fetch-site: same-origin
user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36
x-xsrf-token: Q6IOuVye9r8TH3vAnkVvGcMzb2JHFKGD

{
    "cohort":{
        "definition":[{
            "type":"filter",
            "operation":{
                "operator":"and",
                "operands":[
                    {
                        "operator":"gte",
                        "key":"enrollment",
                        "value":210
                    },
                    {
                        "operator":"lt",
                        "key":"enrollment",
                        "value":700
                    }
                ]
            }
        }],
        "select":["trial_id"]
    },
    "max_count":1000000000,
    "minimal":false,
    "exact_tag_match":true,
    "only_unique":true
}

Response

HTTP/1.1 200 OK
Access-Control-Allow-Headers: Content-Type
Access-Control-Allow-Origin: *
Content-Length: 1174
Content-Type: application/json; char-set: utf-8
Vary: Accept-Encoding
X-Content-Type-Options: nosniff
Date: Thu, 15 Oct 2020 06:05:05 GMT
Connection: close
Strict-Transport-Security: max-age=63072000; includeSubDomains; preload;

{
  "tokens": [
    "enrollment:210$to$179769313486231570000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "enrollment:-179769313486231570000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000$to$699.9"
  ],
  "not_tokens": null,
  "doc_tokens": [
    "trial_id"
  ],
  "cohort_count": 51172,
  "total_count": 354363,
  "sample_size": 1000000000,
  "scale_factor": 0.000051172,
  "corpus": "corpus",
  "parsed_query": {
    "cohort": {
      "definition": [
        {
          "type": "filter",
          "operation": {
            "operator": "and",
            "operands": [
              {
                "operator": "gte",
                "key": "enrollment",
                "value": 210
              },
              {
                "operator": "lt",
                "key": "enrollment",
                "value": 700
              }
            ]
          }
        }
      ],
      "select": [
        "trial_id"
      ]
    }
  },
  "result": [
    {
      "record_id": {
        "type": "integer",
        "value": 51172
      },
      "trial_id": {
        "type": "integer",
        "value": 51172
      }
    }
  ],
  "success": true
}