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https://issues.apache.org/jira/browse/IGNITE-15784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrey Mashenkov updated IGNITE-15784:
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Description:
h3. Motivation.
A user may want to operate with user objects, which types may differ from or
incompatible with a column type.
As a special case, a user may want to transparently serialize an arbitrary
object to byte[] (BLOB) column.
h3. Description.
To achieve this we can provide an interface for the converter and allow passing
custom converters to a mapper.
The converter acts as an interceptor and transforms a value before writing
to/after reading from the column.
Mapper API should be refactored as well to support this.
As a PoC, let's add a test with a converter that performs transparent Java
serialization arbitrary object to byte[] column.
Converters and automatic typecasting is out of the scope,
the goal is to create API and infrastructure for further extension, e.g.
* provide a standard converter component for cross-platform serialization
(based on MessagePack or on IGNITE-15944 ticket ideas)
* optionally add JSON/BSON format support.
* add simple converters for supported native types, e.g. Integer<-->String, and
possibly, support implicit typecasting.
* support unsigned types via implicit typecasting mechanics.
was:
h3. Motivation.
A user may want to operate with user objects, which types may differ from or
incompatible with a column type.
As a special case, a user may want to transparently serialize an arbitrary
object to byte[] (BLOB) column.
h3. Description.
To achieve this we can provide an interface for the converter and allow passing
custom converters to a mapper.
The converter acts as an interceptor and transforms a value before writing
to/after reading from the column.
Mapper API should be refactored as well to support this.
As a PoC, let's add a test with a converter that performs transparent Java
serialization arbitrary object to byte[] column.
As further tickets, we can extend this solution to
* provide a standard converter component for cross-platform serialization
(based on MessagePack or on IGNITE-15944 ticket ideas)
* optionally add JSON/BSON format support.
* add simple converters for supported native types, e.g. Integer<-->String, and
possibly, support implicit typecasting.
* support unsigned types via implicit typecasting mechanics.
> Support custom mapping for fields and column of arbitrary types.
> ----------------------------------------------------------------
>
> Key: IGNITE-15784
> URL: https://issues.apache.org/jira/browse/IGNITE-15784
> Project: Ignite
> Issue Type: Improvement
> Components: sql
> Reporter: Andrey Mashenkov
> Assignee: Andrey Mashenkov
> Priority: Major
> Labels: ignite-3
> Fix For: 3.0.0-alpha4
>
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> h3. Motivation.
> A user may want to operate with user objects, which types may differ from or
> incompatible with a column type.
> As a special case, a user may want to transparently serialize an arbitrary
> object to byte[] (BLOB) column.
> h3. Description.
> To achieve this we can provide an interface for the converter and allow
> passing custom converters to a mapper.
> The converter acts as an interceptor and transforms a value before writing
> to/after reading from the column.
> Mapper API should be refactored as well to support this.
> As a PoC, let's add a test with a converter that performs transparent Java
> serialization arbitrary object to byte[] column.
> Converters and automatic typecasting is out of the scope,
> the goal is to create API and infrastructure for further extension, e.g.
> * provide a standard converter component for cross-platform serialization
> (based on MessagePack or on IGNITE-15944 ticket ideas)
> * optionally add JSON/BSON format support.
> * add simple converters for supported native types, e.g. Integer<-->String,
> and possibly, support implicit typecasting.
> * support unsigned types via implicit typecasting mechanics.
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