Empty Relation

A empty relation is a dummy relation, which can be used either for creating empty data (but with a schema) during read operations or for throwing away records in write operations.

Example

relations:
  empty:
    kind: empty
    schema:
      kind: inline
      fields:
        - name: id
          type: string
        - name: amount
          type: double

Fields

• kind (mandatory) (string): empty

• schema (optional) (schema) (default: empty): Explicitly specifies the schema of the null relation.

• description (optional) (string) (default: empty): A description of the relation. This is purely for informational purpose.

• partitions (optional) (list:partition) (default: empty): Even though a empty relation does not provide any physical storage, it still optionally provides virtual partition columns.

Output Modes

A empty relation supports all output modes, each of them simply discarding all records.