# Expand Json filter plugin for Embulk

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expand columns having json into multiple columns

## Overview

* **Plugin type**: filter

## Configuration

- **json_column_name**: a column name having json to be expanded (string, required)
- **root**: root property to start fetching each entries, specify in [JsonPath](http://goessner.net/articles/JsonPath/) style (string, default: `"$."`)
- **expanded_columns**: columns expanded into multiple columns (array of hash, required)
  - **name**: name of the column. you can define [JsonPath](http://goessner.net/articles/JsonPath/) style.
  - **type**: type of the column (see below)
  - **format**: format of the timestamp if type is timestamp

---
**type of the column**

|name|description|
|:---|:---|
|boolean|true or false|
|long|64-bit signed integers|
|timestamp|Date and time with nano-seconds precision|
|double|64-bit floating point numbers|
|string|Strings|


## Example

```yaml
filters:
  - type: expand_json
    json_column_name: json_payload
    root: "$."
    expanded_columns:
      - {name: "phone_numbers", type: string}
      - {name: "app_id", type: long}
      - {name: "point", type: double}
      - {name: "created_at", type: timestamp, format: "%Y-%m-%d"}
      - {name: "profile.anniversary.et", type: string}
      - {name: "profile.anniversary.voluptatem", type: string}
      - {name: "profile.like_words[1]", type: string}
      - {name: "profile.like_words[2]", type: string}
      - {name: "profile.like_words[0]", type: string}
```

## Note
- If the value evaluated by JsonPath is Array or Hash, the value is written as JSON.

## Dependencies
- https://github.com/jayway/JsonPath
  - use to evaluate [JsonPath](http://goessner.net/articles/JsonPath/)
  - [Apache License Version 2.0](https://github.com/jayway/JsonPath/blob/master/LICENSE)


## Build

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

## Contributor
- @Civitaspo
- @muga