koopatroopa787 opened a new pull request, #22636:
URL: https://github.com/apache/datafusion/pull/22636
## Which issue does this PR close?
Closes #22427
## Rationale for this change
`Literal` serialization/deserialization lived in the central downcast chains
in `to_proto.rs` and `from_proto.rs`. This PR moves it into self-contained
`try_to_proto` / `try_from_proto` hooks on `Literal` itself, following the
pattern established for `NotExpr`, `NegativeExpr`, `IsNullExpr`, and
`IsNotNullExpr`.
## What changes are included in this PR?
- `datafusion/physical-expr/src/expressions/literal.rs`
- Added `#[cfg(feature = "proto")] fn try_to_proto(...)` inside `impl
PhysicalExpr for Literal`
- Added `#[cfg(feature = "proto")] impl Literal { pub fn
try_from_proto(...) }`
- Added `proto_tests` module with encode, null-literal, roundtrip, and
reject-wrong-variant tests
- `datafusion/proto/src/physical_plan/to_proto.rs`
- Removed the `Literal` downcast arm; removed `Literal` from import list
- `datafusion/proto/src/physical_plan/from_proto.rs`
- Replaced the inline `ExprType::Literal` arm with
`Literal::try_from_proto(proto, &decode_ctx)?`
## Are there any user-facing changes?
No. Serialization behaviour is identical; only the code location changed.
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