SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 2)
    Identifier k
    Function count (alias c) (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 2)
           Identifier number
           Function multiIf (alias k) (children 1)
            ExpressionList (children 5)
             Function less (children 1)
              ExpressionList (children 2)
               Identifier number
               Literal UInt64_10
             Literal \'hello\'
             Function less (children 1)
              ExpressionList (children 2)
               Identifier number
               Literal UInt64_50
             Literal \'world\'
             Literal \'goodbye\'
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier system.numbers
          Literal UInt64_100
   ExpressionList (children 1)
    Identifier k
   Function less (children 1)
    ExpressionList (children 2)
     Function nullIf (children 1)
      ExpressionList (children 2)
       Identifier c
       Literal UInt64_10
     Literal UInt64_50
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier c