[EPIC/reference] Port ExecutionPlan serialization to try_to_proto / try_from_proto hooks (full)#23496

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pydantic:execution-plan-proto

Commits on Jul 11, 2026

prototype: ExecutionPlan try_to_proto/try_from_proto hook + ProjectionExec reference (#22419)

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prototype: migrate 7 self-contained ExecutionPlans onto the proto hook (#22419)

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prototype: add typed bytes-only function serde to the ExecutionPlan proto ctx (#22419)

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docs: extend migration guide with function-codec ctx methods + enum by-name rule
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prototype: migrate 14 more ExecutionPlans onto the proto hook incl. AggregateExec (#22419)

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prototype: migrate WindowAggExec + BoundedWindowAggExec onto the proto hook (#22419)

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prototype: DataSource/FileSource proto hook + CsvSource migration (#22419 stack C)

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prototype: migrate Json/Arrow/Avro/Parquet FileSources onto the proto hook (#22419)

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prototype: migrate AsyncFuncExec + ScalarSubqueryExec onto the proto hook (#22419)

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prototype: migrate MemorySourceConfig; DataSourceExec fully on the hook (#22419)

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prototype: migrate the sink family (DataSink hook + 3 file sinks) onto the proto hook (#22419)

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prototype: migrate SortPreservingMergeExec onto the proto hook (#22419)

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Commits on Jul 12, 2026

prototype: delete dead central serialization methods; collapse the downcast chain (#22419)

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