{
  "parameters": {
    "type": "object",
    "properties": {
      "leftKey": {
        "type": "string",
        "description": "Primary join key from the left input."
      },
      "rightKey": {
        "type": "string",
        "description": "Primary join key from the right input."
      },
      "joinType": {
        "type": "string",
        "description": "Join strategy.",
        "enum": [
          "inner",
          "left",
          "right",
          "full"
        ],
        "default": "inner"
      },
      "fields": {
        "type": "array",
        "description": "Fields to copy from the right input onto the joined row.",
        "items": {
          "type": "object",
          "properties": {
            "source": {
              "type": "string",
              "description": "Right-side field name to copy."
            },
            "target": {
              "type": "string",
              "description": "Optional output field name."
            }
          }
        }
      }
    }
  },
  "inputs": [
    {
      "key": "left",
      "label": "Left input",
      "required": true
    },
    {
      "key": "right",
      "label": "Right input",
      "required": true
    }
  ],
  "outputs": [
    {
      "key": "out",
      "label": "Output",
      "required": true
    }
  ],
  "lineage": {
    "mode": "explicit"
  },
  "deterministic": true,
  "runtimeSupported": true
}