API doc for new REST endpoint: /place/stat-vars/union

[beets]

This endpoint allows a user to explore the union of statistical variables which are available for a set of places. Only available as POST

Endpoint: /place/stat-vars/union (code)
Parameters:

• dcids (list)
  Request: curl -X POST https://api.datacommons.org/place/stat-vars/union -d '{ "dcids": ["geoId/06”, “geoId/05”]}'
  Response: {"statVars":["dc/zl73qp466bs28","dc/z6jy58c28k7zh"]}}