curl --request POST \
  --url https://{db}.{region}.api.lancedb.com/v1/table/{name}/add_columns \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "new_columns": [
    {
      "name": "new_column",
      "expression": "old_column + 1"
    }
  ]
}
'

{}