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 arrayMap (alias arr) (children 1)
            ExpressionList (children 2)
             Function lambda (children 1)
              ExpressionList (children 2)
               Function tuple (children 1)
                ExpressionList (children 1)
                 Identifier x
               Function nullIf (children 1)
                ExpressionList (children 2)
                 Identifier x
                 Literal UInt64_2
             Function arrayJoin (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)
