Expand the Python expression API - #9375
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Expose the rest of the Vortex expression builders to Python: comparisons and
arithmetic as free functions, boolean collection helpers, string predicates,
struct/list operations, conditionals, and `variant_get`. Binary operators now
coerce any scalar-convertible Python value on either side, so `1 < ve.column("a")`
works via the reflected `__r*__` methods.
Expressions also gain `serialize`/`vortex.expr.deserialize` and `__reduce__`,
backed by the protobuf wire format, so they can cross a process boundary.
`ByteLength`, `Mask` and `Zip` implemented serialization but were missing from
`ScalarFnSession::default()`, so they serialized and then failed to deserialize
with "unknown expression id"; register them and cover the round trip.
Signed-off-by: Robert Kruszewski <github@robertk.io>
Merging this PR will degrade performance by 5.65%
Warning Please fix the performance issues or acknowledge them on CodSpeed. Performance Changes
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Expand python expression api to cover all of the expressions in the rust api
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