SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function countIf (children 1)
     ExpressionList (children 1)
      Function has (children 1)
       ExpressionList (children 2)
        Identifier x
        Literal UInt64_10
    Function sum (children 1)
     ExpressionList (children 1)
      Identifier y
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier big_array
    TablesInSelectQueryElement (children 1)
     ArrayJoin (children 1)
      ExpressionList (children 1)
       Identifier x (alias y)