SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayElement (children 1)
     ExpressionList (children 2)
      Function array (children 1)
       ExpressionList (children 1)
        Function arrayElement (children 1)
         ExpressionList (children 2)
          Literal Array_[UInt64_10, UInt64_2, UInt64_13, UInt64_15]
          Function toNullable (children 1)
           ExpressionList (children 1)
            Function toLowCardinality (children 1)
             ExpressionList (children 1)
              Literal UInt64_1
      Function materialize (children 1)
       ExpressionList (children 1)
        Function toLowCardinality (children 1)
         ExpressionList (children 1)
          Literal UInt64_1
