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https://issues.apache.org/jira/browse/AVRO-4160?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated AVRO-4160:
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Labels: pull-request-available (was: )
> Replace std::any with std::optional and std::variant in generated structs.
> --------------------------------------------------------------------------
>
> Key: AVRO-4160
> URL: https://issues.apache.org/jira/browse/AVRO-4160
> Project: Apache Avro
> Issue Type: Improvement
> Components: c++
> Reporter: John Dickson
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> C++'s std::any is very powerful, and expensive to use. Since all the types
> are known, avrogencpp generated structures can leverage std::variant for
> union types instead. The interface of std::variant maps to the avro union
> interface, providing a built in union discriminator which removes the need
> for avro union structures to store a second member variable. More
> importantly, this relieves a lot of pressure on the memory allocator for
> deeply nested schemas when unions are heavily used.
> In addition, when a union contains two types, and one of those types is null,
> std::optional can be used for even lighter weight union implementation.
> This can be done with no changes to the API. The emitted structures can even
> be used with previous versions of the avro library.
> Real world testing in our case, this single change reduced transaction times
> by 50%
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