cashmand opened a new pull request, #47917:
URL: https://github.com/apache/spark/pull/47917
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### What changes were proposed in this pull request?
The string-from-metadata and binary-from-metadata types were included in the
initial spec, but never implemented for Spark 4.0 due to complexity and lack of
a compelling use case. This PR removes them from the spec to align with the
implementation. Nothing prevents us from adding these in the future, but Spark
4.0 would presumably not be able to read such a value, so having it in the spec
at this point is confusing.
### Why are the changes needed?
Clarifies Spark behavior.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
It is a README-only change.
### Was this patch authored or co-authored using generative AI tooling?
No.
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