{
  "$schema": "https://json-schema.org/draft-04/schema#",
  "id": "https://api.dataplatform.ibm.com/schemas/common-canvas/expression/expression-info-v3-schema.json",
  "title": "Expression Info",
  "description": "Expression Info Schema for the Common Properties editor",
  "type": "object",
  "properties": {
    "functions": {
      "$ref": "https://api.dataplatform.ibm.com/schemas/common-canvas/expression/function-list-v3-schema.json"
    },
    "fields": {
      "description": "Metadata and content for field and value tables",
      "type": "object",
      "properties": {
        "field_categories": {
          "$ref": "#/definitions/field_categories_def"
        },
        "field_table_info": {
          "$ref": "#/definitions/field_table_info_def"
        }
      }
    },
    "resources": {
      "description": "Map of string resources.",
      "type": "object",
      "properties": {},
      "additionalProperties": true
    },
    "validateLink": {
      "description": "Controls if the validate schema link is shown",
      "type": "boolean"
    }
  },
  "definitions": {
    "field_categories_def": {
      "description": "Array of categories for the field dropdown menu",
      "type": "array",
      "minItems": 0,
      "items": {
        "$ref": "#/definitions/field_categories_item_def"
      },
      "uniqueItems": true
    },
    "field_table_info_def": {
      "description": "Array of table contents for each field category",
      "type": "array",
      "minItems": 0,
      "items": {
        "$ref": "#/definitions/field_table_info_item_def"
      },
      "uniqueItems": true
    },
    "field_categories_item_def": {
      "description": "Metadata of a field dropdown menu item",
      "type": "object",
      "properties": {
        "id": {
          "description": "Unique string to reference this category",
          "type": "string"
        },
        "label": {
          "description": "User-readable name of field category",
          "$ref": "https://api.dataplatform.ibm.com/schemas/common-pipeline/operators/uihints-v3-schema.json#/definitions/resource_definition"
        },
        "field_columns": {
          "description": "Title of the field column",
          "type": "object",
          "properties": {
            "field_column_info": {
              "$ref": "#/definitions/column_header_label"
            },
            "value_column_info": {
              "$ref": "#/definitions/column_header_label"
            },
            "additional_column_info": {
              "$ref": "#/definitions/additional_info_header_label"
            }
          },
          "required": [
            "field_column_info",
            "value_column_info"
          ]
        }
      },
      "required": [
        "id",
        "field_columns"
      ]
    },
    "column_header_label": {
      "description": "Info about columns headers",
      "type": "object",
      "properties":{
        "label": {
          "$ref": "https://api.dataplatform.ibm.com/schemas/common-pipeline/operators/uihints-v3-schema.json#/definitions/resource_definition"
        },
        "description": {
          "$ref": "https://api.dataplatform.ibm.com/schemas/common-pipeline/operators/uihints-v3-schema.json#/definitions/resource_definition"
        }
      }
    },
    "additional_info_header_label": {
      "description": "Info about info columns headers",
      "type": "object",
      "properties":{
        "id": {
          "description": "Unique string to reference this info column "
        },
        "label": {
          "$ref": "https://api.dataplatform.ibm.com/schemas/common-pipeline/operators/uihints-v3-schema.json#/definitions/resource_definition"
        }
      },
      "required": [
        "id"
      ]
    },
    "field_table_info_item_def": {
      "description": "Wrapper for all the field/value groups of a single category",
      "type": "object",
      "properties": {
        "field_category_ref": {
          "description": "Unique string to reference this category",
          "type": "string"
        },
        "field_value_groups": {
          "description": "Array of all the field/value groups of a single category",
          "type": "array",
          "minItems": 0,
          "items": {
            "$ref": "#/definitions/field_value_groups_item_def"
          }
        }
      },
      "required": [
        "field_category_ref"
      ]
    },
    "field_value_groups_item_def": {
      "description": "A field entry, and all associated values and informational columns",
      "type": "object",
      "properties": {
        "id": {
          "description": "Unique identifier for this field entry",
          "type": "string"
        },
        "values": {
          "description": "A list of all values that are associated with this field",
          "type": "array",
          "minItems": 0,
          "items": {
            "$ref": "#/definitions/value_def"
          }
        },
        "value_type": {
          "description":"Value type that will be used in the value array. Can be a primitive type (string, integer, double, date, time, timestamp, binary, boolean, or other)",
          "type":"string"
        },
        "additional_column_entries": {
          "description": "A list of all informational column entries that are associated with this field",
          "type": "array",
          "minItems": 0,
          "items": {
            "$ref": "#/definitions/additional_info_item"
          }
        },
        "additional_column_type": {
          "description":"Object/primitive type used in the info array (string, integer, double, date, time, timestamp, binary, boolean, or custom types)",
          "type":"string"
        }
      },
      "required": [
        "id"
      ]
    },
    "value_def": {
      "description": "A wrapper a value of any basic type",
      "type": "object",
      "properties": {
        "value": {
          "type": ["string","number","integer","boolean", "object", "array", "null"]
        }
      },
      "required": [
        "value"
      ]
    },
    "additional_info_item": {
      "description": "A wrapper a value of any basic type and a column id",
      "type": "object",
      "properties": {
        "id": {
          "description": "A string that uniquely identifies this column, ",
          "type": "string"
        },
        "value": {
          "type": ["string","number","integer","boolean", "object", "array", "null"]
        }
      },
      "required": [
        "id",
        "value"
      ]
    }
  }
}