AT_BANNER([OVSDB -- columns])

OVSDB_CHECK_POSITIVE([ordinary column],
  [[parse-column mycol '{"type": "integer"}']],
  [[{"type":"integer"}]])

OVSDB_CHECK_POSITIVE([immutable column],
  [[parse-column mycol '{"type": "real", "mutable": false}']],
  [[{"mutable":false,"type":"real"}]])

OVSDB_CHECK_POSITIVE([ephemeral column],
  [[parse-column mycol '{"type": "uuid", "ephemeral": true}']],
  [[{"ephemeral":true,"type":"uuid"}]])

OVSDB_CHECK_POSITIVE([column with comment],
  [[parse-column mycol '{"type": "boolean",
                         "comment": "extra information about this column"}']],
  [[{"comment":"extra information about this column","type":"boolean"}]])