AlterQuery  defaults_on_defaults (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration Arr.C1 (children 2)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType UInt32
    Function emptyArrayUInt32 (children 1)
     ExpressionList
 Identifier defaults_on_defaults
