Embulk output plugin for PostgreSQL json column

This Embulk output plugin writes records to a json column of a table.

This works as following:

1. transaction begin: creates a temporary table
2. run: insert records to the temporary table
3. transaction commit: copy the records to the actual table and drop the temporary table

• Plugin type: output
• Load all or nothing: yes
• Resume supported: no

• host host name of the PostgreSQL server (string, required)
• port port of the PostgreSQL server (integer, default: 5432)
• username login user name (string, required)
• password login password (string, default: "")
• database destination database name (string, required)
• table destination table name (string, required)
• column destination column name (string, default: "json")
• column_type json or jsonb (string, default: 'json')

out:
  type: postgres_json
  host: localhost
  port: 5432
  username: pg
  database: embulk_test
  table: load01