AlterQuery  alter_bug (children 2)
 ExpressionList (children 1)
  AlterCommand MODIFY_COLUMN (children 1)
   ColumnDeclaration epoch (children 2)
    Function toUInt64 (children 1)
     ExpressionList (children 1)
      Identifier _time_dec
    Function CODEC (children 1)
     ExpressionList (children 2)
      Function Delta
      Function LZ4
 Identifier alter_bug
