code: private void addColumn(StringBuilder builder, Column column) {
  		builder.append(column.getColumnName());
  		builder.append(" ");
  		builder.append(column.getDataType().getType());
  		Boolean optional = column.isOptional();
  		if (optional != null) {
  			builder.append(optional ? " NULL" : " NOT NULL");
  		}
  		String extraQualifier = column.getExtraQualifier();
  		if (extraQualifier != null) {
  			builder.append(" ");
  			builder.append(extraQualifier);
  		}
  	}
docs: Generate the SQL definition for a column.
  
  @param builder current StringBuilder to add the SQL definition.
  @param column column definition.