SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function COALESCE (children 1)
     ExpressionList
    Function COALESCE (children 1)
     ExpressionList (children 1)
      Literal NULL
    Function COALESCE (children 1)
     ExpressionList (children 2)
      Literal UInt64_1
      Literal NULL