SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 2)
    Function toStartOfMinute (alias dt_m) (children 1)
     ExpressionList (children 1)
      Identifier datetime
    Function countIf (children 1)
     ExpressionList (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier first_time
        Literal UInt64_0
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier projection_test
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias x) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Literal UInt64_1
     TableJoin (children 1)
      Literal UInt64_1
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier domain
     Literal \'1\'
   ExpressionList (children 1)
    Identifier dt_m
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier dt_m