SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 6)
   ExpressionList (children 2)
    Identifier uid
    Function retention (alias r) (children 1)
     ExpressionList (children 2)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier date
        Literal \'2018-08-06\'
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier date
        Literal \'2018-08-07\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier retention_test
   Function in (children 1)
    ExpressionList (children 2)
     Identifier date
     Literal Tuple_(\'2018-08-06\', \'2018-08-07\')
   ExpressionList (children 1)
    Identifier uid
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier uid
   Literal UInt64_5