Igniters,
Want to clarify my proposal about new array store format.
I think we should store array in special binary wrapper that will keep original
component type
```
public class BinaryArrayWrapper implements BinaryObjectEx, Externalizable {
/** Type ID. */
private int compTypeId;
/** Raw data. */
private String compClsName;
/** Value. */
private Object[] arr;
// Further implementation.
}
```
> 30 апр. 2021 г., в 16:31, Nikolay Izhikov <nizhikov....@gmail.com> написал(а):
>
> Hello, Igniters.
>
> Currently, binary marshaller works as follows(Say, we have a class `User`
> then):
>
> IgniteBinary#toBinary(User)` -> BinaryObject
> IgniteBinary#toBinary(User[])` -> Object[]
> IgniteBinary#toBinary(Object[])` -> Object[]
>
> This means, that we lose array component type information during binary
> serialization.
> AFAIK, it’s a design choice made during binary infrastructure development.
>
> This lead to the following disadvantages:
>
> 1. `IgniteBinary` can’t be used as a universal SerDe mechanism.
> 2. Ignite internals(service grid, .Net calls) contains many tweaks and hacks
> to deal with custom user array and still has many issues [1]
>
> I propose to make breaking changes and fix the custom user array SeDe as
> follows:
>
> 1. Implement binary serialization that correctly Ser and Deser array
> using some kind of the wrapper (BinaryArrayWrapper).
>
> IgniteBinary#toBinary(User)` -> BinaryObject
> IgniteBinary#toBinary(User[])` -> BinaryObject
> IgniteBinary#toBinary(Object[])` -> BinaryObject
>
> 2. Introduce system flag `IGNITE_USE_BINARY_ARRAY` that enables correct
> SerDe of arrays. The default value is false to keep backward compatibility in
> the next Ignite release(2.11).
>
> 3. Set `IGNITE_USE_BINARY_ARRAY` to `true` in the ongoing Ignite
> releases (2.12).
>
> WDYT?
>
> [1] https://issues.apache.org/jira/browse/IGNITE-14299
