Phoenix500526 opened a new pull request, #23736:
URL: https://github.com/apache/datafusion/pull/23736
## Which issue does this PR close?
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- Closes #23509.
## Rationale for this change
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Why are you proposing this change? If this is already explained clearly in
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SymmetricHashJoinExec serialization still depends on centralized plan
dispatch, keeping its join, streaming-mode, and ordering wire logic outside the
plan that owns the state. The retained compatibility helpers also duplicate
that logic and can drift from normal dispatch.
Move encoding and decoding behind the plan's ExecutionPlan hooks, route
central dispatch through them, and reduce the deprecated helpers to thin
adapters. Preserve explicit enum and optional-ordering representations, and
expand round-trip coverage across the serialized join state.
## What changes are included in this PR?
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## Are these changes tested?
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Yes
## Are there any user-facing changes?
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