DataSourceColumn.fromJson constructor
      
      DataSourceColumn.fromJson(
    
    
- Map json_
 
Implementation
DataSourceColumn.fromJson(core.Map json_)
  : this(
      formula: json_['formula'] as core.String?,
      reference:
          json_.containsKey('reference')
              ? DataSourceColumnReference.fromJson(
                json_['reference'] as core.Map<core.String, core.dynamic>,
              )
              : null,
    );