No, as I told you, we have to contribute this feature to H2. Sergi
2016-07-28 10:23 GMT+03:00 Dmitriy Setrakyan <[email protected]>: > Sergi, is there a standard way to add a custom type to H2? Is it > documented? > > On Thu, Jul 28, 2016 at 2:17 AM, Sergi Vladykin <[email protected]> > wrote: > > > Sure. > > > > https://issues.apache.org/jira/browse/IGNITE-3595 > > > > Sergi > > > > 2016-07-27 22:51 GMT+03:00 Dmitriy Setrakyan <[email protected]>: > > > > > Sorry, Sergi. What I meant is to file a ticket with the design you > > > suggested > > > > > > Dmitriy > > > > > > > > > > > > > On Jul 27, 2016, at 9:18 AM, Sergi Vladykin < > [email protected]> > > > wrote: > > > > > > > > I don't see how this can work to file a ticket, could you please give > > > more > > > > details? > > > > > > > > Sergi > > > > > > > > 2016-07-27 15:50 GMT+03:00 Dmitriy Setrakyan <[email protected] > >: > > > > > > > >> Sergi, I still thinks my solution works or can be made to work. In > the > > > >> example you provided, you can choose to return either String or Enum > > as > > > the > > > >> query result. However, this is not a clean solution, I agree, but > > could > > > be > > > >> a quick one. > > > >> > > > >> I don't mind breaking compatibility on this issue, given that it > never > > > >> worked properly anyway. Can you please file a ticket? > > > >> > > > >> D. > > > >> > > > >> On Wed, Jul 27, 2016 at 3:01 AM, Sergi Vladykin < > > > [email protected]> > > > >> wrote: > > > >> > > > >>> Nope. This will not work. Because take for example the following > > query: > > > >>> > > > >>> select my_enum_field from my_table where my_enum_field = 'BLA' > > > >>> > > > >>> Field well be evaluated only once here, but it must be a Sting and > > Enum > > > >> at > > > >>> the same time. > > > >> > > > >> > > > >>> Probably we could contribute to H2 `User defined value types` and > > > handle > > > >>> this stuff in our own Enum value types, which will support > comparison > > > >> with > > > >>> String. But this requires bug H2 Modification and is a > compatibility > > > >>> breaking change. > > > >>> > > > >>> Sergi > > > >>> > > > >>> > > > >>> > > > >>> 2016-07-27 9:23 GMT+03:00 Dmitriy Setrakyan <[email protected] > >: > > > >>> > > > >>>> Hm... I would prefer to find a way to handle Enums automatically. > > > >>>> > > > >>>> In case if user expects a String, can we catch an exception and do > > > >>>> automatic conversion at that time? In this case, we could catch > the > > > >>>> exception once and remember the decision. Will something like this > > > >> work? > > > >>>> > > > >>>> D. > > > >>>> > > > >>>> On Tue, Jul 26, 2016 at 1:49 AM, Sergi Vladykin < > > > >>> [email protected]> > > > >>>> wrote: > > > >>>> > > > >>>>> GridQueryProcessor contains two types: BinaryProperty and > > > >>> ClassProperty. > > > >>>>> Indexing uses them for fields access. Probably we can change > them, > > so > > > >>>> that > > > >>>>> they will always return String instead of Enum type but this > > > >>>>> > > > >>>>> 1. looks like a compatibility breaking change; > > > >>>>> 2. users doing queries like `select my_enum_field from my_table` > > > >>> probably > > > >>>>> still expect to get a Enum result but not a String. > > > >>>>> > > > >>>>> What do you think? > > > >>>>> > > > >>>>> Sergi > > > >>>>> > > > >>>>> > > > >>>>> 2016-07-26 3:17 GMT+03:00 Valentin Kulichenko < > > > >>>>> [email protected] > > > >>>>>> : > > > >>>>> > > > >>>>>> Sergi, > > > >>>>>> > > > >>>>>> Ideally, I would like this query to work: > > > >>>>>> > > > >>>>>> select * from MyTable where myEnumField = 'MY_ENUM_NAME' > > > >>>>>> > > > >>>>>> The problem is that the field value is not a string, it's a > binary > > > >>>> object > > > >>>>>> with the enum value ordinal inside. We can add enum value names > > > >> into > > > >>>> the > > > >>>>>> metadata, so that we can always map the field value to its > string > > > >>>>>> representation, but SQL engine will have to know how to use it. > Is > > > >>> this > > > >>>>>> possible? > > > >>>>>> > > > >>>>>> -Val > > > >>>>>> > > > >>>>>> On Fri, Jul 22, 2016 at 10:25 PM, Sergi Vladykin < > > > >>>>> [email protected] > > > >>>>>>> wrote: > > > >>>>>> > > > >>>>>>> I'm not sure what exactly you are going to patch in SQL engine. > > We > > > >>>> could > > > >>>>>>> and some SQL function like enum('MY_ENUM_NAME') but probably it > > > >> will > > > >>>> not > > > >>>>>>> work if we will not pass enum type there as well, so it have > look > > > >>> like > > > >>>>>>> enum('com.mycompany.MyEnum', 'MY_ENUM_NAME') which is ugly. > > > >>>>>>> > > > >>>>>>> Sergi > > > >>>>>>> > > > >>>>>>> On 23 июля 2016 г., 0:43, Valentin Kulichenko < > > > >>>>>>> [email protected] > > > >>>>>>>> wrote: > > > >>>>>>> > > > >>>>>>>> Folks, > > > >>>>>>>> > > > >>>>>>>> I noticed that we currently have a very weird limitation for > > > >> enum > > > >>>>> fields > > > >>>>>>>> when running SQL queries. Basically, you can't use enum value > > > >>> names > > > >>>> as > > > >>>>>>> many > > > >>>>>>>> users would expect. > > > >>>>>>>> > > > >>>>>>>> Technically this happens because binary format stores only > > > >> ordinal > > > >>>> and > > > >>>>>>> the > > > >>>>>>>> only way to run such query is to do something like this: > > > >>>>>>>> > > > >>>>>>>> SqlFieldsQuery qry = new SqlFieldsQuery("select * from Table > > > >> where > > > >>>>>>>> enumField = ?"); > > > >>>>>>>> qry.setArgs(MyEnum.ENUM_VALUE); > > > >>>>>>>> cache.query(qry); > > > >>>>>>>> > > > >>>>>>>> This means that this query can be executed only if: > > > >>>>>>>> - IgniteCache API is used. So it doesn't work in JDBC driver, > > > >>>>> Zeppelin, > > > >>>>>>>> etc. > > > >>>>>>>> - The client that executes the query has the enum class on > > > >>>> classpath. > > > >>>>>>>> > > > >>>>>>>> My first thought about fixing this is to somehow store value > > > >> names > > > >>>> in > > > >>>>>>>> binary metadata and patch the SQL engine so that it > understands > > > >>> how > > > >>>> to > > > >>>>>>> use > > > >>>>>>>> this information. > > > >>>>>>>> > > > >>>>>>>> Thoughts? > > > >>>>>>>> > > > >>>>>>>> -Val > > > >> > > > > > >
