SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 4)
    Identifier k
    Identifier v
    Identifier d
    Identifier i
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 4)
           Function tupleElement (alias k) (children 1)
            ExpressionList (children 2)
             Identifier t
             Literal UInt64_1
           Function tupleElement (alias v) (children 1)
            ExpressionList (children 2)
             Identifier t
             Literal UInt64_2
           Function runningDifference (alias d) (children 1)
            ExpressionList (children 1)
             Identifier v
           Function runningDifference (alias i) (children 1)
            ExpressionList (children 1)
             Function cityHash64 (children 1)
              ExpressionList (children 1)
               Function tupleElement (children 1)
                ExpressionList (children 2)
                 Identifier t
                 Literal UInt64_1
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Subquery (children 1)
              SelectWithUnionQuery (children 1)
               ExpressionList (children 1)
                SelectQuery (children 1)
                 ExpressionList (children 1)
                  Function arrayJoin (alias t) (children 1)
                   ExpressionList (children 1)
                    Function array (children 1)
                     ExpressionList (children 6)
                      Literal Tuple_(\'a\', UInt64_1)
                      Literal Tuple_(\'a\', UInt64_2)
                      Literal Tuple_(\'a\', UInt64_3)
                      Literal Tuple_(\'b\', UInt64_11)
                      Literal Tuple_(\'b\', UInt64_13)
                      Literal Tuple_(\'b\', UInt64_15)
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier i
     Literal UInt64_0