To Json filter plugin for Embulk

Convert a record to jsonl.

• Plugin type: filter

• column: output json column (optional)
  • name (string, default: "json_payload")
  • type string or json (string, default: "string")
• skip_if_null: input column name list (array of string, default: [])
• default_timezone: option for timestamp column, specify the timezone of timestamp value (string, default is UTC)
• default_format: option for timestamp column, specify the format of timestamp value (string, default is %Y-%m-%d %H:%M:%S.%N %z)

filters:
  - type: to_json
    column:
      name: test
      type: string
    skip_if_null: [id]
    default_timezone: Asia/Tokyo

$ ./gradlew classpath
$ embulk run -I lib example/config.yml

$ ./gradlew gem  # -t to watch change of files and rebuild continuously