SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function arrayFilter (children 1)
     ExpressionList (children 2)
      Function lambda (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 1)
          Identifier x
        Function equals (children 1)
         ExpressionList (children 2)
          Identifier x
          Literal \'hello\'
      Literal Array_[\'\']
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.one
    TablesInSelectQueryElement (children 1)
     ArrayJoin (children 1)
      ExpressionList (children 1)
       Literal Array_[UInt64_0] (alias elem)
   Function and (children 1)
    ExpressionList (children 2)
     Function not (children 1)
      ExpressionList (children 1)
       Function ignore (children 1)
        ExpressionList (children 1)
         Identifier elem
     Function arrayExists (children 1)
      ExpressionList (children 2)
       Function lambda (children 1)
        ExpressionList (children 2)
         Function tuple (children 1)
          ExpressionList (children 1)
           Identifier x
         Function equals (children 1)
          ExpressionList (children 2)
           Identifier x
           Literal \'hello\'
       Literal Array_[\'\']
