SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 4)
    Function arrayElement (children 1)
     ExpressionList (children 2)
      Literal Array_[Array_[\'Hello\']]
      Literal UInt64_1
    Function arrayElement (children 1)
     ExpressionList (children 2)
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal Array_[Array_[\'World\']]
      Literal UInt64_1
    Function arrayElement (children 1)
     ExpressionList (children 2)
      Literal Array_[Array_[\'Hello\']]
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal UInt64_1
    Function arrayElement (children 1)
     ExpressionList (children 2)
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal Array_[Array_[\'World\']]
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal UInt64_1