{
  "name": "concatenate_unique",
  "type": "function",
  "groups": ["Aggregates"],
  "description": "Returns all unique strings from a field or expression joined by a delimiter.",
  "arguments": [{
    "arg": "expression",
    "description": "sub expression of field to aggregate"
  }, {
    "arg": "group_by",
    "optional": true,
    "description": "optional expression to use to group aggregate calculations"
  }, {
    "arg": "filter",
    "optional": true,
    "description": "optional expression to use to filter features used to calculate aggregate"
  }, {
    "arg": "concatenator",
    "optional": true,
    "description": "optional string to use to join values. Empty by default."
  }, {
    "arg": "order_by",
    "optional": true,
    "description": "optional expression to use to order features used to calculate aggregate. By default, the features will be returned in an unspecified order."
  }],
  "examples": [{
    "expression": "concatenate_unique(\"town_name\",group_by:=\"state\",concatenator:=',')",
    "returns": "comma separated list of unique town_names, grouped by state field"
  }],
  "tags": ["aggregated", "unique", "field", "joined", "delimiter", "strings"]
}