SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Identifier arr
    Identifier element
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function arrayJoin (alias arr) (children 1)
            ExpressionList (children 1)
             Function array (children 1)
              ExpressionList (children 3)
               Function emptyArrayUInt8 (children 1)
                ExpressionList
               Literal Array_[UInt64_1]
               Literal Array_[UInt64_2, UInt64_3]
    TablesInSelectQueryElement (children 1)
     ArrayJoin (children 1)
      ExpressionList (children 1)
       Identifier arr (alias element)
