fix(expr): preserve metadata across typed null values - #90
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Summary
VALUESfieldsWhy
Some SQL configurations represent
NULLas a typed null scalar such asUtf8View(NULL). Its empty metadata must not conflict with metadata carried by concrete values in the same column. Concrete values with genuinely conflicting metadata remain rejected.This is planning-only and adds no per-row execution work.
Validation
cargo +1.95.0 test -p datafusion-expr logical_plan::builder::tests::test_values_metadatacargo +1.95.0 clippy -p datafusion-expr --all-targets -- -D warningscargo +1.95.0 fmt --all -- --check