How to make preConditions for two columns in liquibase?

I don’t know how to check two columns in table migration. I use liquibase. I wanna to make something like this:

        "preConditions": [
      {
        "onFail": "MARK_RAN",
        "not": {
          "columnExists": {
            "columnName": "first_column",
            "tableName": "my_table"
          },
          "columnExists": {
            "columnName": "second_column",
            "tableName": "my_table"
          }
        }
      }
    ]

Answer

not is supposed to be an array of objects. It may add additional logic by using an “and” (default value) or “or” operators.

I’d go with the following:

 "preConditions": [{
    "onFail": "MARK_RAN",
    "not": [{
        "and": [{
            "columnExists": {
                "columnName": "first_column",
                "tableName": "my_table"
            }
        }, {
            "columnExists": {
                "columnName": "second_column",
                "tableName": "my_table"
            }
        }]
    }]
}]