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Yury Gerzhedovich commented on IGNITE-15784: -------------------------------------------- [~amashenkov] , LGTM in general. Let's add JIRA links for TODOs and may be we should think out the possibility ignore case mode for column names at mappers (as a separate ticket). > 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: 2h 10m > 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. -- This message was sent by Atlassian Jira (v8.20.1#820001)