{
  "$id": "https://opendatafabric.org/schemas/engines/v1alpha1/TransformRequest",
  "$schema": "https://opendatafabric.org/schemas/engines/v1alpha1/meta/EngineMessage",
  "description": "Sent by the coordinator to an engine to perform the next step of data transformation",
  "type": "object",
  "unevaluatedProperties": false,
  "required": [
    "datasetId",
    "datasetAlias",
    "systemTime",
    "vocab",
    "transform",
    "queryInputs",
    "nextOffset",
    "newCheckpointPath",
    "newDataPath"
  ],
  "properties": {
    "datasetId": {
      "type": "string",
      "format": "dataset-id",
      "description": "Unique identifier of the output dataset."
    },
    "datasetAlias": {
      "type": "string",
      "format": "dataset-alias",
      "description": "Alias of the output dataset, for logging purposes only."
    },
    "systemTime": {
      "type": "string",
      "format": "date-time",
      "description": "System time to use for new records."
    },
    "vocab": {
      "$ref": "https://opendatafabric.org/schemas/datasets/v1alpha1/DatasetVocabulary",
      "description": "Vocabulary of the output dataset.",
      "unevaluatedProperties": false
    },
    "transform": {
      "$ref": "https://opendatafabric.org/schemas/datasets/v1alpha1/Transform",
      "description": "Transformation that will be applied to produce new data.",
      "unevaluatedProperties": false
    },
    "queryInputs": {
      "type": "array",
      "items": {
        "$ref": "https://opendatafabric.org/schemas/engines/v1alpha1/TransformRequestInput",
        "unevaluatedProperties": false
      },
      "description": "Defines inputs used in this transaction. Slices corresponding to every input dataset must be present."
    },
    "nextOffset": {
      "type": "integer",
      "format": "uint64",
      "description": "Starting offset to use for new data records."
    },
    "prevCheckpointPath": {
      "type": "string",
      "format": "path",
      "description": "TODO: This will be removed when coordinator will be speaking to engines purely through Arrow."
    },
    "newCheckpointPath": {
      "type": "string",
      "format": "path",
      "description": "TODO: This will be removed when coordinator will be speaking to engines purely through Arrow."
    },
    "newDataPath": {
      "type": "string",
      "format": "path",
      "description": "TODO: This will be removed when coordinator will be speaking to engines purely through Arrow."
    }
  }
}