SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 2)
    Identifier u
    Function windowFunnel (alias s) (children 2)
     ExpressionList (children 2)
      Identifier dt
      Function and (children 1)
       ExpressionList (children 2)
        Function isNull (children 1)
         ExpressionList (children 1)
          Identifier a
        Function isNull (children 1)
         ExpressionList (children 1)
          Identifier b
     ExpressionList (children 1)
      Literal UInt64_86400
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier funnel_test_non_null
   ExpressionList (children 1)
    Identifier u
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier u
 Identifier JSONCompactEachRow
