SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier buf
   Function and (children 1)
    ExpressionList (children 2)
     Function greater (children 1)
      ExpressionList (children 2)
       Identifier ts
       Function toDateTime (children 1)
        ExpressionList (children 1)
         Literal \'2019-03-01 12:00:00\'
     Function less (children 1)
      ExpressionList (children 2)
       Identifier ts
       Function toDateTime (children 1)
        ExpressionList (children 1)
         Literal \'2019-03-02 12:00:00\'