SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Literal \'a\' (alias arr1)
    Literal UInt64_2 (alias arr2)
    Function round (children 1)
     ExpressionList (children 2)
      Function arrayJaccardIndex (children 1)
       ExpressionList (children 2)
        Identifier arr1
        Identifier arr2
      Literal UInt64_2