AlterQuery  data (children 2)
 ExpressionList (children 2)
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration features_legacy_Map.id (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType UInt8
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration features_legacy_Map.count (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType UInt32
 Identifier data
