SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 2)
    Identifier u
    Function windowFunnel (alias s) (children 2)
     ExpressionList (children 3)
      Identifier dt
      Function isNull (children 1)
       ExpressionList (children 1)
        Identifier a
      Function equals (children 1)
       ExpressionList (children 2)
        Function COALESCE (children 1)
         ExpressionList (children 2)
          Identifier b
          Literal \'\'
        Literal \'b3\'
     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